Continuity and discontinuity in development Edit

Childhood development

Childhood development is a subfield of developmental psychology focusing on the physical, cognitive, personality and psychosocial processes of growth between birth to twelve years of age. It is followed by adolescent development.

Exploring

Child development refers to the biological and psychological changes that occur in human beings between birth and the end of adolescence, as the individual progresses from dependency to increasing autonomy. Because these developmental changes may be strongly influenced by genetic factors and events during prenatal life, genetics and prenatal development are usually included as part of the study of child development. Related terms include developmental psychology, referring to development throughout the lifespan, and pediatrics, the branch of medicine relating to the care of children. Developmental change may occur as a result of genetically-controlled processes known as maturation, or as a result of environmental factors and learning, but most commonly involves an interaction between the two.

There are various definitions of periods in child development, since each period is a continuum with individual differences regarding start and ending.

Approximate outline of development periods in child development.

Some age-related development periods and examples of defined intervals are: newborn (ages 0–1 month); infant (ages 1 month – 1 year); toddler (ages 1–3 years); preschooler (ages 4–6years); school-aged child (ages 6–13 years); adolescent (ages 13–20). However, organizations like Zero to Three and the World Association for Infant Mental Health use the term infant as a broad category, including children from birth to age 3, a logical decision considering that the Latin derivation of the word infant refers to those who have no speech.

The optimal development of children is considered vital to society and so it is important to understand the social, cognitive, emotional, and educational development of children. Increased research and interest in this field has resulted in new theories and strategies, with specific regard to practice that promotes development within the school system. In addition there are also some theories that seek to describe a sequence of states that comprise child development.

Contents

Also called "Development in Context" or "Human Ecology" 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. Since its publication in 1979, Bronfenbrenner's major statement of this theory, The Ecology of Human Development ^[2] has had widespread influence on the way psychologists and others approach the study of human beings and their environments. As a result of this influential 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 adulthood.

Piaget Edit

Piaget was a French speaking Swiss theorist who posited that children learn actively through the play process. He suggested that the adult's role in helping the child learn was to provide appropriate materials for the child to interact and construct. He would use Socratic questioning to get the children to reflect on what they were doing. He would try to get them to see contradictions in their explanations. He also developed stages of development. His approach can be seen in how the curriculum is sequenced in schools, and in the pedagogy of preschool centers across the United States.

Piaget StagesEdit

Sensorimotor: (birth to about age 2)

During this stage, the child learns about himself and his environment through motor and reflex actions. Thought derives from sensation and movement. The child learns that he is separate from his environment and that aspects of his environment—his parents or favorite toy—continue to exist even though they may be outside the reach of his senses. Teaching for a child in this stage should be geared to the sensorimotor system. You can modify behavior by using the senses: a frown, a stern or soothing voice—all serve as appropriate techniques.

Preoperational: (begins about the time the child starts to talk to about age 7)
Applying his new knowledge of language, the child begins to use symbols to represent objects. Early in this stage he also personifies objects. He is now better able to think about things and events that aren't immediately present. Oriented to the present, the child has difficulty conceptualizing time. His thinking is influenced by fantasy—the way he'd like things to be—and he assumes that others see situations from his viewpoint. He takes in information and then changes it in his mind to fit his ideas. Teaching must take into account the child's vivid fantasies and undeveloped sense of time. Using neutral words, body outlines and equipment a child can touch gives him an active role in learning.

Concrete: (about first grade to early adolescence)

During this stage, accommodation increases. The child develops an ability to think abstractly and to make rational judgements about concrete or observable phenomena, which in the past he needed to manipulate physically to understand. In teaching this child, giving him the opportunity to ask questions and to explain things back to you allows him to mentally manipulate information.

Formal Operations: (adolescence)

This stage brings cognition to its final form. This person no longer requires concrete objects to make rational judgements. At his point, he is capable of hypothetical and deductive reasoning. Teaching for the adolescent may be wideranging because he'll be able to consider many possibilities from several perspectives.

VygotskyEdit

Main article: Lev Vygotsky

Vygotsky was a theorist who worked during the first decades of the former Soviet Union. He posited that children learn through hands-on experience, as Piaget suggested. However, 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 technique is called "scaffolding," because it builds upon knowledge children already have with new knowledge that adults can help the child learn. An example of this might be when a parent "helps" an infant clap or roll her hands to the pat-a-cake rhyme, until she can clap and roll her hands herself.

Vygotsky was strongly focused on the role of culture in determining the child's pattern of development. He argued that "Every function in the child's cultural development appears twice: first, on the social level, and later, on the individual level; first, between people (interpsychological) and then inside the child (intrapsychological). This applies equally to voluntary attention, to logical memory, and to the formation of concepts. All the higher functions originate as actual relationships between individuals."

Vygotsky felt that development was a process and saw periods of crisis in child development during which there was a qualitative transformation in the child's mental functioning.

Attachment theoryEdit

Main article: Attachment theory

Attachment theory, originating in the work of John Bowlby and developed by Mary Ainsworth, is a psychological, evolutionary and ethological theory that provides a descriptive and explanatory framework for understanding interpersonal relationships between human beings. Attachment theorists consider the human infant to have a need for a relationship with at least one caregiver for normal social and emotional development to occur.

Erik EriksonEdit

Main article: Erik Erikson

Erikson, a follower of Freud's, synthesized both Freud's and his own theories to create what is known as the "psychosocial" stages of human development, which span from birth to death, and focuses on "tasks" at each stage that must be accomplished to successfully navigate life's challenges.

Behavioral TheoriesEdit

John B. Watson’s behaviorism theory forms the foundation of the behavioral model of development. He wrote extensively on child development and conducted research (see Little Albert experiment). Watson was instrumental in the modification of William James’ stream of consciousness approach to construct a stream of behavior theory. Watson also helped bring a natural science perspective to child psychology by introducing objective research methods based on observable and measurable behavior. Following Watson’s lead, B.F. Skinner further extended this model to cover operant conditioning and verbal behavior.

Other theoriesEdit

In accordance with his view of a basic human motivation being the sexual drive, Sigmund Freud developed a psychosexual theory of human development from infancy onward, divided into five stages. Each stage centered around the gratification of the libido within a particular area, or erogenous zone, of the body. He also argued that as humans develop, they become fixated on different and specific objects through their stages of development. Each stage contains conflict which requires resolution to enable the child to develop.

The use of dynamical systems theory as a framework for the consideration of development began in the early 1990s and has continued into the present century.  Dynamic systems theory stresses nonlinear connections (e.g., between earlier and later social assertiveness) and the capacity of a system to reorganize as a phase shift that is stage-like in nature. Another useful concept for developmentalists is the attractor state, a condition (such as teething or stranger anxiety) that helps to determine apparently unrelated behaviors as well as related ones. Dynamic systems theory has been applied extensively to the study of motor development; the theory also has strong associations with some of Bowlby's views about attachment systems. Dynamic systems theory also relates to the concept of the transactional process, a mutually interactive process in which children and parents simultaneously influence each other, producing developmental change in both over time.

The Core Knowledge Perspective is an evolutionary theory in child development that proposes "infants begin life with innate, special-purpose knowledge systems referred to as core domains of thought" There are five core domains of thought, each of which is crucial for survival, which simultaneously prepare us to develop key aspects of early cognition; they are: physical, numerical, linguistic, psychological, and biological.

Physical growthEdit

What develops?Edit

Physical growth in stature and weight occurs over the 15–20 years following birth, as the individual changes from the average weight of 3.5 kg and length of 50 cm at full-term birth to full adult size. As stature and weight increase, the individual's proportions also change, from the relatively large head and small torso and limbs of the neonate, to the adult's relatively small head and long torso and limbs.

Population differencesEdit

Population differences in growth are largely related to adult stature. Ethnic groups that are quite tall in adulthood are also longer at birth and throughout childhood, as compared to groups that have short adult stature. Males are also somewhat taller, although this is more apparent in ethnic groups with strong sexual dimorphism in adulthood. Populations that are characteristically malnourished are also shorter throughout life. However, there are few population differences in growth rates or patterns, except that poor environmental conditions may delay puberty and the associated growth spurt. The markedly different age at puberty of boys and girls means that boys and girls of age 11 or 12 are at very different points in maturation and may reverse the usual sex difference in physical size.

Individual differencesEdit

Individual differences in height and weight during childhood are considerable. Some of these differences are due to family genetic factors, others to environmental factors, but at some points in development they may be strongly influenced by individual differences in reproductive maturation.

Motor developmentEdit

What develops?Edit

A child while learning to walk

Abilities for physical movement change through childhood from the largely reflexive (unlearned, involuntary) movement patterns of the young infant to the highly skilled voluntary movements characteristic of later childhood and adolescence. (Of course, older children and adolescents retain some reflex movements in addition to developing voluntary movement.)

Individual differencesEdit

Normal individual in motor ability are common and depend in part on the child's weight and build. However, after the infant period, normal individual differences are strongly affected by opportunities to practice, observe, and be instructed on specific movements. Atypical motor development may be an indication of developmental delays or problems such as autism or cerebral palsy.

Population differencesEdit

There are some population differences in motor development, with girls showing some advantages in small muscle use, including articulation of sounds with lips and tongue. Ethnic differences in reflex movements of newborn infants have been reported, suggesting that some biological factor is at work. Cultural differences may encourage learning of motor skills like using the left hand only for sanitary purposes and the right hand for all other uses, producing a population difference. Cultural factors are also seen at work in practiced voluntary movements such as the use of the foot to dribble a soccer ball or the hand to dribble a basketball.

What develops?Edit

The capacity to learn, remember, and symbolize information, and to solve problems, exists at a simple level in young infants, who can perform cognitive tasks such as discriminating animate and inanimate beings or recognizing small numbers of objects. During childhood, learning and information-processing increase in speed, memory becomes increasingly longer, and symbol use and the capacity for abstraction develop until a near-adult level is reached by adolescence.

Individual differencesEdit

There are normal individual differences in the ages at which specific cognitive abilities are achieved, but schooling for children in industrialized countries is based on the assumption that these differences are not large. Atypical delays in cognitive development are problematic for children in cultures that demand advanced cognitive skills for work and for independent living.

Population differencesEdit

There are few population differences in cognitive development. Boys and girls show some differences in their skills and preferences, but there is a great deal of overlap between the groups. Differences in cognitive achievement of different ethnic groups appears to result from cultural or other environmental factors.

What develops?Edit

Newborn infants do not seem to experience fear or have preferences for contact with any specific people.By about 8–12 months, they go through a fairly rapid change and become fearful of perceived threats; they also begin to prefer familiar people and show anxiety and distress when separated from them or approached by strangers. The capacity for empathy and the understanding of social rules begin in the preschool period and continue to develop into adulthood. Middle childhood is characterized by friendships with age-mates, and adolescence by emotions connected with sexuality and the beginnings of romantic love. Anger seems most intense during the toddler and early preschool period and during adolescence.

Individual differencesEdit

Individual differences in the sequence of social-emotional development are unusual, but the intensity or expressiveness of emotions can vary greatly from one normal child to another. Individual tendencies to various types of reactivity are probably constitutional, and they are referred to as temperamental differences. Atypical development of social-emotional characteristics may be mildly unusual, or may be so extreme as to indicate mental illness.^[15] Temperamental traits are thought to be stable and enduring throughout the life span. Children who are active and angry as infants can be expected to be active and angry as older children, adolescents and adults.

Population differencesEdit

Population differences may occur in older children, if, for example they have learned that it is appropriate for boys to express emotion or behave differently than girls, or if customs learned by children of one ethnic group are different from those learned in another. Social and emotional differences between boys and girls of a given age may also be associated with differences in the timing of puberty characteristic of the two sexes.

LanguageEdit

What develops?Edit

In addition to acquiring a large spoken vocabulary, there are four main areas in which the child must attain competence, regardless of the language or dialect spoken. These are referred to as phonology or sounds, semantics or the encoded meanings, syntax or the way in which words are combined and pragmatics or knowledge of how language is used in different contexts.

Individual differencesEdit

Slow Expressive Language Development (SELD) a delay in the use of words coupled with normal understanding, is characteristic of a small proportion of children who later display normal language use.

Dyslexia is a significant topic in child development as it affects approximately 5% of the population (in the western world). Essentially it is a disorder whereby children fail to attain the language skills of reading, writing and spelling commensurate with their intellectual abilities. Dyslexic children show a range of differences in their language development, from subtle speech impairments to mispronunciations to word-finding difficulties. The most common phonological difficulties are limitations of verbal short-term memory and phonological awareness. Such children often have difficulties with long-term verbal learning such as months of the year, learning tables,late 1980s the phonological deficit hypothesis has become the dominant explanation. The difficulties in early articulation, basic phonological skills and acquiring basic building blocks means that dyslexics have to invest too many resources in just coping with the basics rather than acquiring new information or skills. Early identification enables children to receive help before they fail.

Atypically delayed language development may be diagnostic of autism, and regression of language may indicate serious disabilities like Rett syndrome. Poor language development also accompanies general developmental delays such as those found in Down syndrome.

 

Childhood development

Childhood development is a subfield of developmental psychology focusing on the physical, cognitive, personality and psychosocial processes of growth between birth to twelve years of age. It is followed by adolescent development.

Exploring

Child development refers to the biological and psychological changes that occur in human beings between birth and the end of adolescence, as the individual progresses from dependency to increasing autonomy. Because these developmental changes may be strongly influenced by genetic factors and events during prenatal life, genetics and prenatal development are usually included as part of the study of child development. Related terms include developmental psychology, referring to development throughout the lifespan, and pediatrics, the branch of medicine relating to the care of children. Developmental change may occur as a result of genetically-controlled processes known as maturation, or as a result of environmental factors and learning, but most commonly involves an interaction between the two.

There are various definitions of periods in child development, since each period is a continuum with individual differences regarding start and ending.

Approximate outline of development periods in child development.

Some age-related development periods and examples of defined intervals are: newborn (ages 0–1 month); infant (ages 1 month – 1 year); toddler (ages 1–3 years); preschooler (ages 4–6years); school-aged child (ages 6–13 years); adolescent (ages 13–20). However, organizations like Zero to Three and the World Association for Infant Mental Health use the term infant as a broad category, including children from birth to age 3, a logical decision considering that the Latin derivation of the word infant refers to those who have no speech.

The optimal development of children is considered vital to society and so it is important to understand the social, cognitive, emotional, and educational development of children. Increased research and interest in this field has resulted in new theories and strategies, with specific regard to practice that promotes development within the school system. In addition there are also some theories that seek to describe a sequence of states that comprise child development.

Contents

Also called "Development in Context" or "Human Ecology" 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. Since its publication in 1979, Bronfenbrenner's major statement of this theory, The Ecology of Human Development ^[2] has had widespread influence on the way psychologists and others approach the study of human beings and their environments. As a result of this influential 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 adulthood.

Piaget Edit

Piaget was a French speaking Swiss theorist who posited that children learn actively through the play process. He suggested that the adult's role in helping the child learn was to provide appropriate materials for the child to interact and construct. He would use Socratic questioning to get the children to reflect on what they were doing. He would try to get them to see contradictions in their explanations. He also developed stages of development. His approach can be seen in how the curriculum is sequenced in schools, and in the pedagogy of preschool centers across the United States.

Piaget StagesEdit

Sensorimotor: (birth to about age 2)

During this stage, the child learns about himself and his environment through motor and reflex actions. Thought derives from sensation and movement. The child learns that he is separate from his environment and that aspects of his environment—his parents or favorite toy—continue to exist even though they may be outside the reach of his senses. Teaching for a child in this stage should be geared to the sensorimotor system. You can modify behavior by using the senses: a frown, a stern or soothing voice—all serve as appropriate techniques.

Preoperational: (begins about the time the child starts to talk to about age 7)
Applying his new knowledge of language, the child begins to use symbols to represent objects. Early in this stage he also personifies objects. He is now better able to think about things and events that aren't immediately present. Oriented to the present, the child has difficulty conceptualizing time. His thinking is influenced by fantasy—the way he'd like things to be—and he assumes that others see situations from his viewpoint. He takes in information and then changes it in his mind to fit his ideas. Teaching must take into account the child's vivid fantasies and undeveloped sense of time. Using neutral words, body outlines and equipment a child can touch gives him an active role in learning.

Concrete: (about first grade to early adolescence)

During this stage, accommodation increases. The child develops an ability to think abstractly and to make rational judgements about concrete or observable phenomena, which in the past he needed to manipulate physically to understand. In teaching this child, giving him the opportunity to ask questions and to explain things back to you allows him to mentally manipulate information.

Formal Operations: (adolescence)

This stage brings cognition to its final form. This person no longer requires concrete objects to make rational judgements. At his point, he is capable of hypothetical and deductive reasoning. Teaching for the adolescent may be wideranging because he'll be able to consider many possibilities from several perspectives.

VygotskyEdit

Main article: Lev Vygotsky

Vygotsky was a theorist who worked during the first decades of the former Soviet Union. He posited that children learn through hands-on experience, as Piaget suggested. However, 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 technique is called "scaffolding," because it builds upon knowledge children already have with new knowledge that adults can help the child learn. An example of this might be when a parent "helps" an infant clap or roll her hands to the pat-a-cake rhyme, until she can clap and roll her hands herself.

Vygotsky was strongly focused on the role of culture in determining the child's pattern of development. He argued that "Every function in the child's cultural development appears twice: first, on the social level, and later, on the individual level; first, between people (interpsychological) and then inside the child (intrapsychological). This applies equally to voluntary attention, to logical memory, and to the formation of concepts. All the higher functions originate as actual relationships between individuals."

Vygotsky felt that development was a process and saw periods of crisis in child development during which there was a qualitative transformation in the child's mental functioning.

Attachment theoryEdit

Main article: Attachment theory

Attachment theory, originating in the work of John Bowlby and developed by Mary Ainsworth, is a psychological, evolutionary and ethological theory that provides a descriptive and explanatory framework for understanding interpersonal relationships between human beings. Attachment theorists consider the human infant to have a need for a relationship with at least one caregiver for normal social and emotional development to occur.

Erik EriksonEdit

Main article: Erik Erikson

Erikson, a follower of Freud's, synthesized both Freud's and his own theories to create what is known as the "psychosocial" stages of human development, which span from birth to death, and focuses on "tasks" at each stage that must be accomplished to successfully navigate life's challenges.

Behavioral TheoriesEdit

John B. Watson’s behaviorism theory forms the foundation of the behavioral model of development. He wrote extensively on child development and conducted research (see Little Albert experiment). Watson was instrumental in the modification of William James’ stream of consciousness approach to construct a stream of behavior theory. Watson also helped bring a natural science perspective to child psychology by introducing objective research methods based on observable and measurable behavior. Following Watson’s lead, B.F. Skinner further extended this model to cover operant conditioning and verbal behavior.

Other theoriesEdit

In accordance with his view of a basic human motivation being the sexual drive, Sigmund Freud developed a psychosexual theory of human development from infancy onward, divided into five stages. Each stage centered around the gratification of the libido within a particular area, or erogenous zone, of the body. He also argued that as humans develop, they become fixated on different and specific objects through their stages of development. Each stage contains conflict which requires resolution to enable the child to develop.

The use of dynamical systems theory as a framework for the consideration of development began in the early 1990s and has continued into the present century.  Dynamic systems theory stresses nonlinear connections (e.g., between earlier and later social assertiveness) and the capacity of a system to reorganize as a phase shift that is stage-like in nature. Another useful concept for developmentalists is the attractor state, a condition (such as teething or stranger anxiety) that helps to determine apparently unrelated behaviors as well as related ones. Dynamic systems theory has been applied extensively to the study of motor development; the theory also has strong associations with some of Bowlby's views about attachment systems. Dynamic systems theory also relates to the concept of the transactional process, a mutually interactive process in which children and parents simultaneously influence each other, producing developmental change in both over time.

The Core Knowledge Perspective is an evolutionary theory in child development that proposes "infants begin life with innate, special-purpose knowledge systems referred to as core domains of thought" There are five core domains of thought, each of which is crucial for survival, which simultaneously prepare us to develop key aspects of early cognition; they are: physical, numerical, linguistic, psychological, and biological.

Continuity and discontinuity in development Edit

Although the identification of developmental milestones is of interest to researchers and to children's caregivers, many aspects of developmental change are continuous and do not display noticeable milestones of change. Continuous developmental changes, like growth in stature, involve fairly gradual and predictable progress toward adult characteristics. When developmental change is discontinuous, however, researchers may identify not only milestones of development, but related age periods often called stages. A stage is a period of time, often associated with a known chronological age range, during which a behavior or physical characteristic is qualitatively different from what it is at other ages. When an age period is referred to as a stage, the term implies not only this qualitative difference, but also a predictable sequence of developmental events, such that each stage is both preceded and followed by specific other periods associated with characteristic behavioral or physical qualities.

Stages of development may overlap or be associated with specific other aspects of development, such as speech or movement. Even within a particular developmental area, transition into a stage may not mean that the previous stage is completely finished. For example, in Erikson's discussion of stages of personality, this theorist suggests that a lifetime is spent in reworking issues that were originally characteristic of a childhood stage. Similarly, the theorist of cognitive development, Piaget, described situations in which children could solve one type of problem using mature thinking skills, but could not accomplish this for less familiar problems, a phenomenon he called horizontal decalage.

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