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Developmental psychology
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Special used in the psychological study of infants.
Piaget's test for Conservation. One of the many experiments used for children.
Developmental psychology is the scientific study of how and why human beings change over the course of their life. Originally concerned with infants and children, the field has expanded to include adolescence, adult development, aging, and the entire lifespan. Developmental psychologists aim to explain how thinking, feeling and behaviour change throughout life. This field examines change across three major dimensions: physical development, cognitive development, and socioemotional development.[1][citation needed] Within these three dimensions are a broad range of topics including motor skills, executive functions, moral understanding, language acquisition, social change, personality, emotional development, self-concept and identity formation.
Developmental psychology examines the influences of nature and nurture on the process of human development, and processes of change in context and across time. Many researchers are interested in the interaction between personal characteristics, the individual's behavior and environmental factors, including social context and the built environment. Ongoing debates include biological essentialism vs. neuroplasticity and stages of development vs. dynamic systems of development.
Developmental psychology involves a range of fields, such as, educational psychology, child psychopathology, forensic developmental psychology, child development, cognitive psychology, ecological psychology, and cultural psychology. Influential developmental psychologists from the 20th century include Urie Bronfenbrenner, Erik Erikson, Sigmund Freud, Jean Piaget, Barbara Rogoff, Esther Thelen, and Lev Vygotsky.
Contents
[hide]
1 Historical antecedents
2 Theories
2.1 Psychosexual development
2.2 Stages of moral development
2.3 Stages of psychosocial development
2.4 Theories of cognitive development
2.5 Stages based on the model of hierarchical complexity
2.6 Ecological systems theory
2.7 Zone of proximal development
2.8 Constructivism
2.9 Evolutionary developmental psychology
2.10 Attachment theory
3 Major debates
3.1 Nature vs nurture
3.2 Continuity vs discontinuity
3.3 Stability vs change
4 Mechanisms of development
5 Research areas
5.1 Cognitive development
5.2 Social and emotional development
5.3 Physical development
5.4 Memory development
6 Research methods and designs
6.1 Main research methods
6.2 Research designs
7 Life stages of psychological development
7.1 Prenatal development
7.2 Infancy
7.2.1 Infant perception
7.2.2 Language
7.2.3 Infant cognition: the Piagetian era
7.2.4 Recent findings in infant cognition
7.2.5 Critical periods of development
7.2.6 Developmental delays
7.3 Toddler-hood
7.4 Childhood
7.5 Adolescence
7.6 Early adulthood
7.7 Middle adulthood
7.8 Old age
8 Parenting
8.1 Parenting styles
8.2 Mother and father factors
8.3 Divorce
9 See also
10 References
11 Further reading
11.1 Journals
12 External links
Historical antecedents[edit]
John B. Watson and Jean-Jacques Rousseau are typically cited as providing the foundations for modern developmental psychology.[2] In the mid-18th century Jean Jacques Rousseau described three stages of development: infants (infancy), puer (childhood) and adolescence in Emile: Or, On Education. Rousseau's ideas were taken up strongly by educators at the time.
It generally focuses on how and why certain modifications throughout an individual’s life-cycle (cognitive, social, intellectual, personality) and human growth change over time. There are many theorists that have made a profound contribution to this area of psychology. For example, Erik Erikson developed a model of eight stages of psychological development. He believed that humans developed in stages throughout their lifetimes and this would have an impact on their behaviors (Similar ideas to Sigmund Freud)[3]
In the late 19th century, psychologists familiar with the evolutionary theory of Darwin began seeking an evolutionary description of psychological development;[2] prominent here was the pioneering psychologist G. Stanley Hall,[2] who attempted to correlate ages of childhood with previous ages of mankind. James Mark Baldwin who wrote essays on topics that included Imitation: A Chapter in the Natural History of Consciousness and Mental Development in the Child and the Race: Methods and Processes. Baldwin was heavily involved in the theory of developmental psychology.[2] Sigmund Freud, whose concepts were developmental, had a significant impact on public perceptions.[2]
Theories[edit]
Psychosexual development[edit]
Main article: Psychosexual development
Sigmund Freud believed that we all had a conscious, preconscious, and unconscious level. In the conscious we are aware of our mental process. The preconscious involves information that, though not currently in our thoughts, can be brought into consciousness. Lastly, the unconscious includes mental processes we are unaware of.
He believed there is tension between the conscious and unconscious because the conscious tries to hold back what the unconscious tries to express. To explain this he developed three personality structures: the id, ego, and superego. The id, the most primitive of the three, functions according to the pleasure principle: seek pleasure and avoid pain.[4] The superego plays the critical and moralizing role; and the ego is the organized, realistic part that mediates between the desires of the id and the superego.[5]
Based on this, he proposed five universal stages of development, that each are characterized by the erogenous zone that is the source of the child's psychosexual energy. The first is the oral stage, which occurs from birth to 12 months of age. During the oral stage "the libido is centered in a baby's mouth." The baby is able to suck. The second is the anal stage, from one to three years of age. During the anal stage, the child defecates from the anus and is often fascinated with their defecation. The third is the phallic stage, which occurs from three to five years of age (most of a person's personality forms by this age). During the phallic stage, the child is aware of their sexual organs. The fourth is the latency stage, which occurs from age five until puberty. During the latency stage, the child's sexual interests are repressed. Stage five is the genital stage, which takes place from puberty until adulthood. During the genital stage, puberty starts happening.[6]
Stages of moral development[edit]
Main article: Lawrence Kohlberg's stages of moral development
Piaget claimed that logic and morality develop through constructive stages.[7] Expanding on Piaget's work, Lawrence Kohlberg determined that the process of moral development was principally concerned with justice, and that it continued throughout the individual's lifetime.[8]
He suggested three levels of moral reasoning; preconventional moral reasoning, conventional moral reasoning, and postconventional moral reasoning. Preconventional moral reasoning is typical of children and is characterized by reasoning that is based on rewards and punishments associated with different courses of action. Conventional moral reason occurs during late childhood and early adolescence and is characterized by reasoning based on rules and conventions of society. Lastly, postconventional moral reasoning is a stage during which the individual sees society's rules and conventions as relative and subjective, rather than as authoritative.[9]
Kohlberg used the Heinz Dilemma to apply to his stages of moral development. The Heinz Dilemma involves Heinz's wife dying from cancer and Heinz having the dilemma to save his wife by stealing a drug. Preconventional morality, conventional morality, and postconventional morality applies to Heinz's situation.[10]
Stages of psychosocial development[edit]
Main article: Erikson's stages of psychosocial development
German-American psychologist Erik Erikson and his collaborator and wife, Joan Erikson, conceptualized eight stages of psychosocial development that they theorized healthy individuals pass through as they develop from infancy to adulthood.[11] The first stage is called "Trust vs. Mistrust" takes place in infancy. The best virtue for the first stage is hope, in the infant learning who to trust and having hope for a supportive group of people to be there for him/her. The second stage is "Autonomy vs. Shame and Doubt" with the best virtue being will. This takes place in early childhood where the child learns to become more independent by discovering what they are capable of where if the child is overly controlled, they believe to feel inadequate on surviving by themselves, which can lead to low self-esteem and doubt. The third stage is "Initiative vs. Guilt". The basic virtue that would be gained is purpose and takes place in the play age. This is the stage where the child will be curious and have many interactions with other kids. They will ask many questions as their curiosity grows. If too much guilt is present, the child may have a slower and harder time interacting with other children. The fourth stage is "Industry (competence) vs. Inferiority". The basic virtue for this stage is competency which happens at the school age. This stage is when the child will try to win the approval of others and fit in and understand the value of their accomplishments. The fifth stage is "Identity vs. Role Confusion". The basic virtue gained is fidelity which takes place in adolescence. This is where the child will start to find who he/she is as a person in society. What sex role he/she picks. The sixth stage is "Intimacy vs. Isolation", which happens in young adults and the virtue gained is love. This is where the person will start to share his/her life with someone else intimately and emotionally. In not doing so, it could lead to isolation. The seventh stage is "Generativity vs. Stagnation". This happens in adulthood and the virtue gained would be care. We become stable and start to give back by raising a family and becoming involved in the community. The eighth stage is "Ego Integrity vs. Despair". This happens during maturity and wisdom is gained. When one grows old and they contemplate and look back and seeing the success or failure of their life. This is also the stage where one can also have closure and accept death without fearing anything.[12]
Theories of cognitive development[edit]
Main article: Piaget's theory of cognitive development
Jean Piaget, a Swiss theorist, posited that children learn by actively constructing knowledge through hands-on experience.[13] He suggested that the adult's role in helping the child learn was to provide appropriate materials that the child can interact with and use to construct. He used Socratic questioning to get children to reflect on what they were doing, and he tried to get them to see contradictions in their explanations.
Piaget believed that intellectual development takes place through a series of stages, which he described in his theory on cognitive development. Each stage consists of steps the child must master before moving to the next step. He believed that these stages are not separate from one another, but rather that each stage builds on the previous one in a continuous learning process. He proposed four stages: sensorimotor, pre-operational, concrete operational, and formal operational. Though he did not believe these stages occurred at any given age, many studies have determined when these cognitive abilities should take place.[14]
Stages based on the model of hierarchical complexity[edit]
Main article: Model of hierarchical complexity
Michael Commons enhanced and simplified of Inhelder and Piaget's developmental and offers a standard method of examining the universal pattern of development. The Model of Hierarchical Complexity (MHC) is not based on the assessment of domain specific information, It divides the Order of Hierarchical Complexity of tasks to be addressed from the Stage performance on those tasks. Stage is the order hierarchical complexity of the tasks the participant's successfully addresses. He expanded Piaget's original eight stage (counting the half stages) to fifteen stages. The stages are : 0 Calculatory; 1 Sensory & Motor; 2 Circular sensory-motor; 3 Sensory-motor; 4 Nominal; 5 Sentential; 6 Preoperational; 7 Primary; 8 Concrete; 9 Abstract; 10 Formal; 11 Systematic; 12 Metasystematic; 13 Paradigmatic; 14 Cross-paradigmatic; 15 Meta-Cross-paradigmatic. The order of hierarchical complexity of tasks predicts how difficult the performance is with a R ranging from 0.9 to 0.98.
In the MHC, there are three main axioms for an order to meet in order for the higher order task to coordinate the next lower order task. Axioms are rules that are followed to determine how the MHC orders actions to form a hierarchy. These axioms are: a) defined in terms of tasks at the next lower order of hierarchical complexity task action; b) defined as the higher order task action that organizes two or more less complex actions; that is, the more complex action specifies the way in which the less complex actions combine; c) defined as the lower order task actions have to be carried out non-arbitrarily.
Ecological systems theory[edit]
Main article: Ecological systems theory
Bronfenbrenner's ecological systems theory
Ecological systems theory, originally formulated by Urie Bronfenbrenner, specifies four types of nested environmental systems, with bi-directional influences within and between the systems. The four systems are microsystem, mesosystem, exosystem, and macrosystem. Each system contains roles, norms and rules that can powerfully shape development. Microsystem is the direct environment in our lives such as our home and school. Mesosystem is how relationships connect to the microsystem. Exosystem is a larger social system where the child plays no role. Macrosystem refers to the cultural values, customs and laws of society.[15]
The microsystem is the immediate environment surrounding and influencing the individual (example: school or the home setting). The mesosystem is the combination of two microsystems and how they influence each other (example: sibling relationships at home vs. peer relationships at school). The exosystem is the interaction among two or more settings that are indirectly linked (example: a father's job requiring more overtime ends up influencing his daughter's performance in school because he can no longer help with her homework). The macrosystem is broader taking into account social economic status, culture, beliefs, customs and morals (example: a child from a wealthier family sees a peer from a less wealthy family as inferior for that reason). Lastly, the chronosystem refers to the chronological nature of life events and how they interact and change the individual and their circumstances through transition (example: a mother losing her own mother to illness and no longer having that support in her life).[14]
Since its publication in 1979, Bronfenbrenner's major statement of this theory, The Ecology of Human Development[16] has had widespread influence on the way psychologists and others approach the study of human beings and their environments. As a result of this conceptualization of development, these environments—from the family to economic and political structures—have come to be viewed as part of the life course from childhood through to adulthood.[17]
Zone of proximal development[edit]
Main article: Zone of proximal development
Lev Vygotsky was a Russian theorist from the Soviet era, who posited that children learn through hands-on experience and social interactions with members of his/her culture.[18] Unlike Piaget, he claimed that timely and sensitive intervention by adults when a child is on the edge of learning a new task (called the "zone of proximal development") could help children learn new tasks. This adult role is often referred to as the skilled "master," whereas the child is considered the learning apprentice through an educational process often termed "cognitive apprenticeship" Martin Hill stated that "The world of reality does not apply to the mind of a child." This technique is called "scaffolding," because it builds upon knowledge children already have with new knowledge that adults can help the child learn.[19] Vygotsky was strongly focused on the role of culture in determining the child's pattern of development, arguing that development moves from the social level to the individual level.[19] In other words, Vygotsky claimed that psychology should focus on the progress of human consciousness through the relationship of an individual and their environment.[20] He felt that if scholars continued to disregard this connection, then this disregard would inhibit the full comprehension of the human consciousness.[20]
Constructivism[edit]
Main article: Constructivism (psychological school)
Constructivism is a paradigm in psychology that characterizes learning as a process of actively constructing knowledge. Individuals create meaning for themselves or make sense of new information by selecting, organizing, and integrating information with other knowledge, often in the context of social interactions. Constructivism can occur in two ways: individual and social. Individual constructivism is when a person constructs knowledge through cognitive processes of their own experiences rather than by memorizing facts provided by others. Social constructivism is when individuals construct knowledge through an interaction between the knowledge they bring to a situation and social or cultural exchanges within that content.[14]
Jean Piaget, a Swiss developmental psychologist, proposed that learning is an active process because children learn through experience and make mistakes and solve problems. Piaget proposed that learning should be whole by helping students understand that meaning is constructed.[21]
Evolutionary developmental psychology[edit]
Main article: Evolutionary developmental psychology
Evolutionary developmental psychology is a research paradigm that applies the basic principles of Darwinian evolution, particularly natural selection, to understand the development of human behavior and cognition. It involves the study of both the genetic and environmental mechanisms that underlie the development of social and cognitive competencies, as well as the epigenetic (gene-environment interactions) processes that adapt these competencies to local conditions.[22]
EDP considers both the reliably developing, species-typical features of ontogeny (developmental adaptations), as well as individual differences in behavior, from an evolutionary perspective. While evolutionary views tend to regard most individual differences as the result of either random genetic noise (evolutionary byproducts)[23] and/or idiosyncrasies (for example, peer groups, education, neighborhoods, and chance encounters)[24] rather than products of natural selection, EDP asserts that natural selection can favor the emergence of individual differences via "adaptive developmental plasticity."[22][25] From this perspective, human development follows alternative life-history strategies in response to environmental variability, rather than following one species-typical pattern of development.[22]
EDP is closely linked to the theoretical framework of evolutionary psychology (EP), but is also distinct from EP in several domains, including research emphasis (EDP focuses on adaptations of ontogeny, as opposed to adaptations of adulthood) and consideration of proximate ontogenetic and environmental factors (i.e., how development happens) in addition to more ultimate factors (i.e., why development happens), which are the focus of mainstream evolutionary psychology.[26]
Attachment theory[edit]
Main article: Attachment theory
Attachment theory, originally developed by John Bowlby, focuses on the importance of open, intimate, emotionally meaningful relationships.[27] Attachment is described as a biological system or powerful survival impulse that evolved to ensure the survival of the infant. A child who is threatened or stressed will move toward caregivers who create a sense of physical, emotional and psychological safety for the individual. Attachment feeds on body contact and familiarity. Later Mary Ainsworth developed the Strange Situation protocol and the concept of the secure base.
Theorists have proposed four types of attachment styles:[28] secure, anxious-avoidant, anxious-resistant,[9] and disorganized.[28] Secure attachment is a healthy attachment between the infant and the caregiver. It is characterized by trust. Anxious-avoidant is an insecure attachment between an infant and a caregiver. This is characterized by the infant's indifference toward the caregiver. Anxious-resistant is an insecure attachment between the infant and the caregiver characterized by distress from the infant when separated and anger when reunited.[9] Disorganized is an attachment style without a consistent pattern of responses upon return of the parent.[28]
A child can be hindered in its natural tendency to form attachments. Some babies are raised without the stimulation and attention of a regular caregiver, or locked away under conditions of abuse or extreme neglect. The possible short-term effects of this deprivation are anger, despair, detachment, and temporary delay in intellectual development. Long-term effects include increased aggression, clinging behavior, detachment, psychosomatic disorders, and an increased risk of depression as an adult.[29][page needed][30][page needed]
Attachment style can impact the relationships of people. Attachment is established in early childhood and attachment continues in adulthood. An example of secure attachment continuing in adulthood would be when the person feels confident and is able to meet their own needs. An example of anxious attachment during adulthood is when the adult chooses a partner with anxious-avoidant attachment.[31]
Major debates[edit]
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Nature vs nurture[edit]
A significant issue in developmental psychology is the relationship between innateness and environmental influence in regard to any particular aspect of development. This is often referred to as "nature and nurture" or nativism versus empiricism. A nativist account of development would argue that the processes in question are innate, that is, they are specified by the organism's genes.
An empiricist perspective would argue that those processes are acquired in interaction with the environment. Today developmental psychologists rarely take such polarised positions with regard to most aspects of development; rather they investigate, among many other things, the relationship between innate and environmental influences. One of the ways this relationship has been explored in recent years is through the emerging field of evolutionary developmental psychology.
One area where this innateness debate has been prominently portrayed is in research on language acquisition. A major question in this area is whether or not certain properties of human language are specified genetically or can be acquired through learning. The empiricist position on the issue of language acquisition suggests that the language input provides the necessary information required for learning the structure of language and that infants acquire language through a process of statistical learning. From this perspective, language can be acquired via general learning methods that also apply to other aspects of development, such as perceptual learning.
The nativist position argues that the input from language is too impoverished for infants and children to acquire the structure of language. Linguist Noam Chomsky asserts that, evidenced by the lack of sufficient information in the language input, there is a universal grammar that applies to all human languages and is pre-specified. This has led to the idea that there is a special cognitive module suited for learning language, often called the language acquisition device. Chomsky's critique of the behaviorist model of language acquisition is regarded by many as a key turning point in the decline in the prominence of the theory of behaviorism generally.[32] But Skinner's conception of "Verbal Behavior" has not died, perhaps in part because it has generated successful practical applications.[32]
Continuity vs discontinuity[edit]
Since theorists believe that development is a smooth, continuous process, individuals gradually add more of the same types of skills throughout their lives. Other theorists, however, think that development takes place in discontinuous stages. People change rapidly and step up to a new level, and then change very little for a while. With each new step, the person shows interest and responds to the world qualitatively.
Stability vs change[edit]
This issue involves the degree to which we become older renditions of our early experience or whether we develop into something different from who we were at an earlier point in development. It considers the extent to which early experiences ( especially infancy) or later experiences are the key determinants of a person's development.
Most life span developmentalists recognise that extreme positions are unwise. Therefore, the key to comprehensive understanding of development at any stage requires interaction of different factors and not only one.
Mechanisms of development[edit]
Developmental psychology is concerned not only with describing the characteristics of psychological change over time, but also seeks to explain the principles and internal workings underlying these changes. Psychologists have attempted to better understand these factors by using models. Developmental models are sometimes computational, but they do not need to be.
A model must simply account for the means by which a process takes place. This is sometimes done in reference to changes in the brain that may correspond to changes in behavior over the course of the development. Computational accounts of development often use either symbolic, connectionist (neural network), or dynamical systems models to explain the mechanisms of development.
Research areas[edit]
Cognitive development[edit]
Main articles: Cognitive development, Theory of cognitive development, and Neo-Piagetian theories of cognitive development
Cognitive development is primarily concerned with the ways that infants and children acquire, develop, and use internal mental capabilities such as: problem solving, memory, and language. Major topics in cognitive development are the study of language acquisition and the development of perceptual and motor skills. Piaget was one of the influential early psychologists to study the development of cognitive abilities. His theory suggests that development proceeds through a set of stages from infancy to adulthood and that there is an end point or goal.
Other accounts, such as that of Lev Vygotsky, have suggested that development does not progress through stages, but rather that the developmental process that begins at birth and continues until death is too complex for such structure and finality. Rather, from this viewpoint, developmental processes proceed more continuously. Thus, development should be analyzed, instead of treated as a product to obtain.
K. Warner Schaie has expanded the study of cognitive development into adulthood. Rather than being stable from adolescence, Schaie sees adults as progressing in the application of their cognitive abilities.[33]
Modern cognitive development has integrated the considerations of cognitive psychology and the psychology of individual differences into the interpretation and modeling of development.[34] Specifically, the neo-Piagetian theories of cognitive development showed that the successive levels or stages of cognitive development are associated with increasing processing efficiency and working memory capacity. These increases explain differences between stages, progression to higher stages, and individual differences of children who are the same-age and of the same grade-level. However, other theories have moved away from Piagetian stage theories, and are influenced by accounts of domain-specific information processing, which posit that development is guided by innate evolutionarily-specified and content-specific information processing mechanisms.
Social and emotional development[edit]
Main article: Social psychology
Developmental psychologists who are interested in social development examine how individuals develop social and emotional competencies. For example, they study how children form friendships, how they understand and deal with emotions, and how identity develops. Research in this area may involve study of the relationship between cognition or cognitive development and social behavior.
Emotional regulation or ER refers to an individual's ability to modulate emotional responses across a variety of contexts. In young children, this modulation is in part controlled externally, by parents and other authority figures. As children develop, they take on more and more responsibility for their internal state. Studies have shown that the development of ER is affected by the emotional regulation children observe in parents and caretakers, the emotional climate in the home, and the reaction of parents and caretakers to the child's emotions.[35]
Music also has a huge influence on stimulating and enhancing the senses of a child through self-expression.[36]
A child's social and emotional development can be disrupted by motor coordination problems as evidenced by the environmental stress hypothesis. The environmental hypothesis explains how children with coordination problems and developmental coordination disorder are exposed to several psychosocial consequences which act as secondary stressors, leading to an increase in internalizing symptoms such as depression and anxiety.[37] Motor coordination problems affect fine and gross motor movement as well as perceptual-motor skills. Secondary stressors commonly identified include the tendency for children with poor motor skills to be less likely to participate in organized play with other children and more likely to feel socially isolated.[37]
Social and emotional development focuses on 5 keys areas: Self-Awareness, Self Management, Social Awareness, Relationship Skills and Responsible Decision Making.[38]
Physical development[edit]
Physical development concerns the physical maturation of an individual's body until it reaches the adult stature. Although physical growth is a highly regular process, all children differ tremendously in the timing of their growth spurts.[39] Studies are being done to analyze how the differences in these timings affect and are related to other variables of developmental psychology such as information processing speed. Traditional measures of physical maturity using x-rays are less in practice nowadays, compared to simple measurements of body parts such as height, weight, head circumference, and arm span.[39]
A few other studies and practices with physical developmental psychology are the phonological abilities of mature 5- to 11-year-olds, and the controversial hypotheses of left-handers being maturationally delayed compared to right-handers. A study by Eaton, Chipperfield, Ritchot, and Kostiuk in 1996 found in three different samples that there was no difference between right- and left-handers.[39]
Memory development[edit]
Researchers interested in memory development look at the way our memory develops from childhood and onward. According to Fuzzy-trace theory, we have two separate memory processes: verbatim and gist. These two traces begin to develop at different times as well as at a different pace. Children as young as 4 years-old have verbatim memory, memory for surface information, which increases up to early adulthood, at which point it begins to decline. On the other hand, our capacity for gist memory, memory for semantic information, increases up to early adulthood, at which point it is consistent through old age. Furthermore, our reliance on gist memory traces increases as we age.[40]
Research methods and designs[edit]
Main research methods[edit]
Developmental psychology employs many of the research methods used in other areas of psychology. However, infants and children cannot be tested in the same ways as adults, so different methods are often used to study their development.
Developmental psychologists have a number of methods to study changes in individuals over time. Common research methods include systematic observation, including naturalistic observation or structured observation; self-reports, which could be clinical interviews or structured interviews; clinical or case study method; and ethnography or participant observation.[41]:31–35 These methods differ in the extent of control researchers impose on study conditions, and how they construct ideas about which variables to study.[42] Every developmental investigation can be characterized in terms of whether its underlying strategy involves the experimental, correlational, or case study approach.[43][44] The experimental method involves "actual manipulation of various treatments, circumstances, or events to which the participant or subject is exposed;[44] the experimental design points to cause-and-effect relationships.[45] This method allows for strong inferences to be made of causal relationships between the manipulation of one or more independent variables and subsequent behavior, as measured by the dependent variable.[44] The advantage of using this research method is that it permits determination of cause-and-effect relationships among variables.[45] On the other hand, the limitation is that data obtained in an artificial environment may lack generalizability.[45] The correlational method explores the relationship between two or more events by gathering information about these variables without researcher intervention.[44][45] The advantage of using a correlational design is that it estimates the strength and direction of relationships among variables in the natural environment;[45] however, the limitation is that it does not permit determination of cause-and-effect relationships among variables.[45] The case study approach allows investigations to obtain an in-depth understanding of an individual participant by collecting data based on interviews, structured questionnaires, observations, and test scores.[45] Each of these methods have its strengths and weaknesses but the experimental method when appropriate is the preferred method of developmental scientists because it provides a controlled situation and conclusions to be drawn about cause-and-effect relationships.[44]
Research designs[edit]
Most developmental studies, regardless of whether they employ the experimental, correlational, or case study method, can also be constructed using research designs.[42] Research designs are logical frameworks used to make key comparisons within research studies such as:
cross-sectional design
longitudinal design
sequential design
microgenetic design
In a longitudinal study, a researcher observes many individuals born at or around the same time (a cohort) and carries out new observations as members of the cohort age. This method can be used to draw conclusions about which types of development are universal (or normative) and occur in most members of a cohort. As an example a longitudinal study of early literacy development examined in detail the early literacy experiences of one child in each of 30 families.[46]
Researchers may also observe ways that development varies between individuals, and hypothesize about the causes of variation in their data. Longitudinal studies often require large amounts of time and funding, making them unfeasible in some situations. Also, because members of a cohort all experience historical events unique to their generation, apparently normative developmental trends may in fact be universal only to their cohort.[41]:40
In a cross-sectional study, a researcher observes differences between individuals of different ages at the same time. This generally requires less resources than the longitudinal method, and because the individuals come from different cohorts, shared historical events are not so much of a confounding factor. By the same token, however, cross-sectional research may not be the most effective way to study differences between participants, as these differences may result not from their different ages but from their exposure to different historical events.[41]:41
A third study design, the sequential design, combines both methodologies. Here, a researcher observes members of different birth cohorts at the same time, and then tracks all participants over time, charting changes in the groups. While much more resource-intensive, the format aids in a clearer distinction between what changes can be attributed to individual or historical environment from those that are truly universal.[41]:42
Because every method has some weaknesses, developmental psychologists rarely rely on one study or even one method to reach conclusions by finding consistent evidence from as many converging sources as possible.[44]
Life stages of psychological development[edit]
See also: Child development stages
Prenatal development[edit]
Main article: Prenatal development
See also: Fetal psychology
Prenatal development is of interest to psychologists investigating the context of early psychological development. The whole prenatal development involves three main stages: germinal stage, embryonic stage and fetal stage. Germinal stage begins at conception until 2 weeks; embryonic stage means the development from 2 weeks to 8 weeks; fetal stage represents 9 weeks until birth of the baby.[47][better source needed] The senses develop in the womb itself: a fetus can both see and hear by the second trimester (13 to 24 weeks of age). Sense of touch develops in the embryonic stage (5 to 8 weeks).[41]:97 Most of the brain's billions of neurons also are developed by the second trimester.[41]:100 Babies are hence born with some odor, taste and sound preferences, largely related to the mother's environment.[41]:101
Some primitive reflexes too arise before birth and are still present in newborns. One hypothesis is that these reflexes are vestigial and have limited use in early human life. Piaget's theory of cognitive development suggested that some early reflexes are building blocks for infant sensorimotor development. For example, the tonic neck reflex may help development by bringing objects into the infant's field of view.[48]
Other reflexes, such as the walking reflex appear to be replaced by more sophisticated voluntary control later in infancy. This may be because the infant gains too much weight after birth to be strong enough to use the reflex, or because the reflex and subsequent development are functionally different.[49] It has also been suggested that some reflexes (for example the moro and walking reflexes) are predominantly adaptations to life in the womb with little connection to early infant development.[48] Primitive reflexes reappear in adults under certain conditions, such as neurological conditions like dementia or traumatic lesions.
Ultrasound has shown that infants are capable of a range of movements in the womb, many of which appear to be more than simple reflexes.[49] By the time they are born, infants can recognize and have a preference for their mother's voice suggesting some prenatal development of auditory perception.[49] Prenatal development and birth complications may also be connected to neurodevelopmental disorders, for example in schizophrenia. With the advent of cognitive neuroscience, embryology and the neuroscience of prenatal development is of increasing interest to developmental psychology research.
Several environmental agents—teratogens—can cause damage during the prenatal period. These include prescription and nonprescription drugs, illegal drugs, tobacco, alcohol, environmental pollutants, infectious disease agents such as the rubella virus and the toxoplasmosis parasite, maternal malnutrition, maternal emotional stress, and Rh factor blood incompatibility between mother and child.[41]:102–115 There are many statistics which prove the aforementioned substances effects. A leading example of this would be that, in America alone, approximately 100,000-375,000 'cocaine babies' are born on an annual basis. This is a result of an expectant mother abusing the drug while pregnant. 'Cocaine babies' are proven to have quite severe and lasting difficulties which persist throughout infancy and right throughout childhood. The drug also encourages behavioural problems in the affected children, as well as defects of various vital organs.[50]
Infancy[edit]
Main articles: Infant and child psychology and Infant cognitive development
From birth until the first year, the child is referred to as an infant.[41] Developmental psychologists vary widely in their assessment of infant psychology, and the influence the outside world has upon it, but certain aspects are relatively clear.
The majority of a newborn infant's time is spent in sleep. At first this sleep is evenly spread throughout the day and night, but after a couple of months, infants generally become diurnal.
Infants can be seen to have six states, grouped into pairs:
quiet sleep and active sleep (dreaming, when REM sleep occurs)
quiet waking, and active waking
fussing and crying
Infant perception[edit]
Infant perception is what a newborn can see, hear, smell, taste, and touch. These five features are better known as one's "five senses".[51] Infants respond to stimuli differently in these different states.[49]
Vision is significantly worse in infants than in older children. Infant sight tends to be blurry in early stages but improves over time. Color perception similar to that seen in adults has been demonstrated in infants as young as four months, using habituation methods.[48] Infants get to adult-like vision in about six months.[41]:191
Hearing is well-developed prior to birth, unlike vision. Newborns prefer complex sounds to pure tones, human speech to other sounds, mother's voice to other voices, and the native language to other languages. Scientist believe these features are probably learned in the womb.[41]:151 Infants are fairly good at detecting the direction a sound comes from, and by 18 months their hearing ability is approximately equal to an adult's.
Smell and taste are present, with infants showing different expressions of disgust or pleasure when presented with pleasant odors (honey, milk, etc.) or unpleasant odors (rotten egg) and tastes (e.g. sour taste). Newborns are born with odor and taste preferences acquired in the womb from the smell and taste of amniotic fluid, in turn influenced by what the mother eats. Both breast- and bottle-fed babies around 3 days old prefer the smell of human milk to that of formula, indicating an innate preference.[41]:150 There is good evidence for older infants preferring the smell of their mother to that of others.[48]
Touch and feel is one of the better-developed senses at birth considering it's one of the first senses to develop inside the womb.[52] This is evidenced by the primitive reflexes described above, and the relatively advanced development of the somatosensory cortex.[53]
Pain: Infants feel pain similarly, if not more strongly than older children but pain-relief in infants has not received so much attention as an area of research.[54] Glucose is known to relieve pain in newborns.[55]
Language[edit]
Main article: Language development
Babies are born with the ability to discriminate virtually all sounds of all human languages.[41]:189 Infants of around six months can differentiate between phonemes in their own language, but not between similar phonemes in another language. At this stage infants also start to babble, producing phonemes.
Infant cognition: the Piagetian era[edit]
Piaget suggested that an infant's perception and understanding of the world depended on their motor development, which was required for the infant to link visual, tactile and motor representations of objects.[56] According to this view, it is through touching and handling objects that infants develop object permanence, the understanding that objects are solid, permanent, and continue to exist when out of sight.[49]
Special methods are used in the psychological study of infants.
Piaget's sensorimotor stage comprised six sub-stages (see sensorimotor stages for more detail). In the early stages, development arises out of movements caused by primitive reflexes.[57] Discovery of new behaviors results from classical and operant conditioning, and the formation of habits.[57] From eight months the infant is able to uncover a hidden object but will persevere when the object is moved.
Piaget came to his conclusion that infants lacked a complete understanding of object permanence before 18 months after observing infants' failure before this age to look for an object where it was last seen. Instead infants continue to look for an object where it was first seen, committing the "A-not-B error." Some researchers have suggested that before the age of eight to nine months, infants' inability to understand object permanence extends to people, which explains why infants at this age do not cry when their mothers are gone ("Out of sight, out of mind").
Recent findings in infant cognition[edit]
In the 1980s and 1990s, researchers have developed many new methods of assessing infants' understanding of the world with far more precision and subtlety than Piaget was able to do in his time. Since then, many studies based on these methods suggest that young infants understand far more about the world than first thought.
Based on recent findings, some researchers (such as Elizabeth Spelke and Renee Baillargeon) have proposed that an understanding of object permanence is not learned at all, but rather comprises part of the innate cognitive capacities of our species.
Other research has suggested that young infants in their first six months of life may possess an understanding of numerous aspects of the world around them, including:
an early numerical cognition, that is, an ability to represent number and even compute the outcomes of addition and subtraction operations;[58]
an ability to infer the goals of people in their environment;[59]
an ability to engage in simple causal reasoning.[60]
Critical periods of development[edit]
There are critical periods in infancy and childhood during which development of certain perceptual, sensorimotor, social and language systems depends crucially on environmental stimulation.[61] Feral children such as Genie, deprived of adequate stimulation, fail to acquire important skills and are unable to learn in later childhood. The concept of critical periods is also well-established in neurophysiology, from the work of Hubel and Wiesel among others.
Developmental delays[edit]
Children with developmental delays (DD) are at heightened risk for developing clinically significant behavioral and emotional difficulties as compared to children with typical development (TD). However, nearly all studies comparing psychopathology in youth with DD employ TD control groups of the same chronological age (CA).This comorbidity of DD and a mental disorder is often referred to as dual diagnosis. Epidemiological studies indicate that 30–50% of youth with DD meet the clinical cutoff for behavioral and emotional problems and/or diagnosable mental disorder. Studies that include comparison samples of children with typical development (TD) highlight the considerable difference in risk for psychopathology, with the relative risk for youth with DD (to youth with TD) ranging from 2.8–4.1 to 1.[citation needed]
Toddler-hood[edit]
Main article: Toddler
Infants shift between ages of one and two to a developmental stage known as toddlerhood. In this stage, an infant's transition into toddlerhood is highlighted through self-awareness, developing maturity in language use, and presence of memory and imagination.
During toddlerhood, babies begin learning how to walk, talk, and make decisions for themselves. An important characteristic of this age period is the development of language, where children are learning how to communicate and express their emotions and desires through the use of vocal sounds, babbling, and eventually words.[62] Self-control also begins to develop. At this age, children take initiative to explore, experiment, and learn from making mistakes. Caretakers who encourage toddlers to try new things and test their limits, help the child become autonomous, self-reliant, and confident.[63] If the caretaker is overprotective or disapproving of independent actions, the toddler may begin to doubt their abilities and feel ashamed of the desire for independence. The child's autonomic development is inhibited, leaving them less prepared to deal with the world in the future. Toddlers also begin to identify themselves in gender roles, acting according to their perception of what a man or woman should do.[64]
Socially, the period of toddler-hood is commonly called the "terrible twos".[65] Toddlers often use their new-found language abilities to voice their desires, but are often misunderstood by parents due to their language skills just beginning to develop. A person at this stage testing their independence is another reason behind the stage's infamous label. Tantrums in a fit of frustration are also common.
Childhood[edit]
See also: Early childhood
Erik Erikson divides childhood into four stages, each with its distinct social crisis:[66]
Stage 1: Infancy (0 to 1½) in which the psychosocial crisis is Trust vs. Mistrust
Stage 2: Early childhood (2½ to 3) in which the psychosocial crisis is Autonomy vs. Shame and doubt
Stage 3: Play age (3 to 5) in which the psychosocial crisis is Initiative vs. Guilt. (This stage is also called the "pre-school age," "exploratory age" and "toy age."[67])
Stage 4: School age (5 to 12) in which the psychosocial crisis is Industry vs. Inferiority
Play (or preschool) ages 3–5.
In the earliest years, children are "completely dependent on the care of others." Therefore, they develop a "social relationship" with their care givers and, later, with family members. During their preschool years (3-5), they "enlarge their social horizons" to include people outside the family.[68]
Preoperational and then operational thinking develops, which means actions are reversible, and egocentric thought diminishes.[69]
The motor skills of preschoolers increase so they can do more things for themselves. They become more independent. No longer completely dependent on the care of others, the world of this age group expands. More people have a role in shaping their individual personalities. Preschoolers explore and question their world.[70] For Jean Piaget, the child is "a little scientist exploring and reflecting on these explorations to increase competence" and this is done in "a very independent way."[71]
Play is a major activity for ages 3–5. For Piaget, through play "a child reaches higher levels of cognitive development."[72]
In their expanded world, children in the 3-5 age group attempt to find their own way. If this is done in a socially acceptable way, the child develops initiative. If not, the child develops guilt.[73] Children who develop "guilt" rather than "initiative" have failed Erikson's psychosocial crisis for the 3-5 age group.
Middle childhood ages 6–12.
For Erik Erikson, the psychosocial crisis during middle childhood is Industry vs. Inferiority which, if successfully met, instills a sense of Competency in the child.[66]
In all cultures, middle childhood is a time for developing "skills that will be needed in their society."[74] School offers an arena in which children can gain a view of themselves as "industrious (and worthy)." They are "graded for their school work and often for their industry." They can also develop industry outside of school in sports, games, and doing volunteer work.[75] Children who achieve "success in school or games might develop a feeling of competence."
The "peril during this period is that feelings of inadequacy and inferiority will develop.[74] Parents and teachers can "undermine" a child's development by failing to recognize accomplishments or being overly critical of a child's efforts.[75] Children who are "encouraged and praised" develop belief in their competence. Lack of encouragement or ability to excel lead to "feelings of inadequacy and inferiority".[76]
The Centers for Disease Control (the CDC) divides Middle Childhood into two stages, 6–8 years and 9–11 years, and gives "developmental milestones for each stage."[77]
Middle Childhood (7-10).
Entering elementary school, children in this age group begin to thinks about the future and their "place in the world." Working with other students and wanting their friendship and acceptance become more important. This leads to "more independence from parents and family." As students, they develop the mental and verbal skills "to describe experiences and talk about thoughts and feelings". They become less self-centered and show "more concern for others".[78]
Middle Childhood (9-11).
For children ages 9–11 "friendships and peer relationships" increase in strength, complexity, and importance. This results in greater "peer pressure." They grow even less dependent on their families and they are challenged academically. To meet this challenge, they increase their attention span and learn to see other points of view.[79]
Adolescence[edit]
Main article: Adolescent psychology
Adolescence is the period of life between the onset of puberty and the full commitment to an adult social role, such as worker, parent, and/or citizen. It is the period known for the formation of personal and social identity (see Erik Erikson) and the discovery of moral purpose (see William Damon). Intelligence is demonstrated through the logical use of symbols related to abstract concepts and formal reasoning. A return to egocentric thought often occurs early in the period. Only 35% develop the capacity to reason formally during adolescence or adulthood. (Huitt, W. and Hummel, J. January 1998)[80]
It is divided into three parts, namely:
Early Adolescence: 9 to 13 years (preteen),
Mid Adolescence: 13 to 15 years and
Late Adolescence: 15 to 18 years
The adolescent unconsciously explores questions such as "Who am I? Who do I want to be?" Like toddlers, adolescents must explore, test limits, become autonomous, and commit to an identity, or sense of self. Different roles, behaviors and ideologies must be tried out to select an identity. Role confusion and inability to choose vocation can result from a failure to achieve a sense of identity through, for example, friends.
Early adulthood[edit]
Main article: Young adult (psychology)
Early adulthood, according to theorists such as Erik Erikson, is a stage where development is mainly focused on maintaining relationships.[81] Examples include creating bond of intimacy, sustaining friendships, and ultimately making a family. Some theorists state that development of intimacy skills rely on the resolution of previous developmental stages. A sense of identity gained in the previous stages is also necessary for intimacy to develop. If this skill is not learned the alternative is alienation, isolation, a fear of commitment, and the inability to depend on others.
A related framework for studying this part of the life span is that of emerging adulthood. Scholars of emerging adulthood, such as Jeffrey Arnett, are not necessarily interested in relationship development. Instead, this concept suggests that people transition after their teenage years into a period not characterized as relationship building and an overall sense of constancy with life, but with years of living with parents, phases of self-discovery, and experimentation.[82]
Middle adulthood[edit]
Main article: Middle age
Middle adulthood generally refers to the period between ages 25 to 69. During this period, middle-aged adults experience a conflict between generativity and stagnation. They may either feel a sense of contributing to society, the next generation, or their immediate community; or develop a sense of purposelessness.
Physically, the middle-aged experience a decline in muscular strength, reaction time, sensory keenness, and cardiac output. Also, women experience menopause and a sharp drop in the hormone estrogen. Men experience an equivalent endocrine system event to menopause. Andropause in males is a hormone fluctuation with physical and psychological effects that can be similar to those seen in menopausal females. As men age, lowered testosterone levels can contribute to mood swings and a decline in sperm count. Sexual responsiveness can also be affected, including delays in erection and longer periods of penile stimulation required to achieve ejaculation.
Old age[edit]
Main article: Old age
The World Health Organization finds "no general agreement on the age at which a person becomes old." Most "developed countries" set the age as 60 or 65. However, in developing countries inability to make "active contribution" to society, not chronological age, marks the beginning of old age.[83] According to Erikson's stages of psychosocial development, old age is the stage in which individuals assess the quality of their lives. In reflecting on their lives, people in this age group develop a feeling of integrity if deciding that their lives were successful or a feeling of despair if evaluation of one's life indicates a failure to achieve goals.[84]
Physically, older people experience a decline in muscular strength, reaction time, stamina, hearing, distance perception, and the sense of smell.[85] They also are more susceptible to diseases such as cancer and pneumonia due to a weakened immune system.[86] Programs aimed at balance, muscle strength, and mobility have been shown to reduce disability among mildly (but not more severely) disabled elderly.[87]
Sexual expression depends in large part upon the emotional and physical health of the individual. Many older adults continue to be sexually active and satisfied with their sexual activity.[88]
Mental disintegration may also occur, leading to dementia or ailments such as Alzheimer's disease. It is generally believed that crystallized intelligence increases up to old age, while fluid intelligence decreases with age.[89] Whether or not normal intelligence increases or decreases with age depends on the measure and study. Longitudinal studies show that perceptual speed, inductive reasoning, and spatial orientation decline.[90] An article on adult cognitive development reports that cross-sectional studies show that "some abilities remained stable into early old age."[91]
Parenting[edit]
Parenting variables alone have typically accounted for 20 to 50 percent of the variance in child outcomes.[92]
All parents have their own parenting styles. Parenting styles, according to Kimberly Kopoko, are "based upon two aspects of parenting behavior; control and warmth. Parental control refers to the degree to which parents manage their children's behavior. Parental warmth refers to the degree to which parents are accepting and responsive of their children's behavior."[93]
Parenting styles[edit]
The following parenting styles have been described in the child development literature:
Authoritative parenting is characterized as parents who have high parental warmth, responsiveness, and demandingness, but rate low in negativity and conflict.[94] These parents are assertive but not intrusive or overly restrictive.[95] This method of parenting is associated with more positive social and academic outcomes. Interestingly, the beneficial outcomes of authoritative parenting are not necessarily universal. Among African American adolescents, authoritative parenting is not associated with academic achievement without peer support for achievement.[94] Children who are raised by authoritative parents are "more likely to become independent, self-reliant, socially accepted, academically successful, and well-behaved. They are less likely to report depression and anxiety, and less likely to engage in antisocial behavior like delinquency and drug use."[96]
Authoritarian parenting is characterized by low levels of warmth and responsiveness with high levels of demandingness and firm control.[94] These parents focus on obedience and they monitor their children regularly.[95] In general, this style of parenting is associated with maladaptive outcomes. Interestingly, the outcomes are more harmful for middle class boys than girls, preschool white girls than preschool black girls, and for white boys than Hispanic boys.[95] Furthermore, the negative effects of authoritarian parenting among Asian Americans can be offset by positive peer support.[94] Finally, among African Americans, some elements of authoritarian parenting such as firm control and physical discipline do not serve as predictive factors for negative outcomes.[94]
Permissive parenting is characterized by high levels of responsiveness combined with low levels of demandingness.[95] These parents are lenient and do not necessarily require mature behavior.[95] They allow for a high degree of self-regulation and typically avoid confrontation.[95] Compared to children raised using the authoritative style, preschool girls raised in permissive families are less assertive.[95] Additionally, preschool children of both sexes are less cognitively competent than those children raised under authoritative parenting styles.[95]
Rejecting or neglectful parenting is the final category. This is characterized by low levels of demandingness and responsiveness. These parents are typically disengaged in their child's lives, lacking structure in their parenting styles and are unsupportive.[95] Children in this category are typically the least competent of all the categories.[95]
Mother and father factors[edit]
Parenting roles in child development have typically focused on the role of the mother. Recent literature, however, has looked toward the father as having an important role in child development. Affirming a role for fathers, studies have shown that children as young as 15 months benefit significantly from substantial engagement with their father.[97][98] In particular, a study in the U.S. and New Zealand found the presence of the natural father was the most significant factor in reducing rates of early sexual activity and rates of teenage pregnancy in girls.[99] Furthermore, another argument is that neither a mother nor a father is actually essential in successful parenting, and that single parents as well as homosexual couples can support positive child outcomes.[100] According to this set of research, children need at least one consistently responsible adult with whom the child can have a positive emotional connection. Having more than one of these figures contributes to a higher likelihood of positive child outcomes.[100]
Divorce[edit]
Another parental factor often debated in terms of its effects on child development is divorce. Divorce in itself is not a determining factor of negative child outcomes. In fact, the majority of children from divorcing families fall into the normal range on measures of psychological and cognitive functioning.[101] A number of mediating factors play a role in determining the effects divorce has on a child, for example, divorcing families with young children often face harsher consequences in terms of demographic, social, and economic changes than do families with older children.[101] Positive coparenting after divorce is part of a pattern associated with positive child coping, while hostile parenting behaviors lead to a destructive pattern leaving children at risk.[101] Additionally, direct parental relationship with the child also affects the development of a child after a divorce. Overall, protective factors facilitating positive child development after a divorce are maternal warmth, positive father-child relationship, and cooperation between parents.[101]
See also[edit]
Psychology portal
Adult
Attitude change
Behavioral cusp
Child development
Developmental psychobiology
Developmental psychopathology
Developmental systems theory
Educational Psychology
Erikson's stages of psychosocial development
Ethnic identity development
Evolutionary developmental psychopathology
Fuzzy-trace theory
Group development
Microgenetic design
Ontogenetic parade
Outline of psychology
Perceptual narrowing
Pre- and perinatal psychology
Scale error
Sociometric status
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Further reading[edit]
Bjorklund, D.F.; Pellegrini, A.D. (2000). "Child Development and Evolutionary Psychology" (PDF). Child Development. 71 (6): 1687–1708. doi:10.1111/1467-8624.00258. PMID 11194266.
Bornstein, M.H. & Lamb, M.E. (2005). Developmental science: An advanced textbook. Mahwah, NJ: Erlbaum, 2005.
Johnson-Pynn, J.; Fragaszy, D.M.; Cummins-Sebree, S. (2003). "Common territories in comparative and developmental psychology: The quest for shared means and meaning in behavioral investigations" (PDF). International Journal of Comparative Psychology. 16: 1–27.
Lerner, R.M. Concepts and theories of human development. Mahwah, NJ: Erlbaum, 2002.
Reid, V.; Striano, T. & Koops, W. Social Cognition During infancy. Psychology Press. 2007
Journals[edit]
Prominent journals in developmental psychology include:
Journal of the American Academy of Child and Adolescent Psychiatry
Journal of Child Psychology and Psychiatry
Development and Psychopathology
Child Development
Autism Research
Kindheit und Entwicklung
Journal of Autism and Developmental Disorders
European Child & Adolescent Psychology
Developmental Science
Developmental Review
Psychology and Aging
Journal of Abnormal Child Psychology
Developmental Psychology
Journal of Adolescent Health
Research in Autism Spectrum Disorders
Developmental Neuropsychology
Journal of Research on Adolescence
Journal of Youth and Adolescence
Journal of Clinical Child and Adolescent Psychology
Journal of Pediatric Psychology
External links[edit]
The Society for Research in Child Development
The British Psychological Society, Developmental Psychology Section
Developmental Psychology: lessons for teaching and learning developmental psychology
GMU's On-Line Resources for Developmental Psychology: a web directory of developmental psychology organizations
Home Economics Archive: Research, Tradition, History (HEARTH)
An e-book collection of over 1,000 books spanning 1850 to 1950, created by Cornell University's Mann Library. Includes several hundred works on human development, child raising, and family studies itemized in a specific bibliography.
Developmental psychology Subject Area page at PLOS
Library resources about
developmental psychology
Resources in your library
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