Developmental Psychology: Structured Study Notes

Developmental Psychology

Overview of Development

Developmental psychology examines the physical, cognitive, and psychosocial changes that occur throughout the lifespan. It explores how individuals grow, learn, and adapt from infancy to adulthood, considering both biological and environmental influences.

• Physical Development: Changes in body, brain, senses, motor skills, and health.

• Psychosocial Development: Changes in emotions, personality, and social relationships.

• Cognitive Development: Changes in learning, thinking, and reasoning abilities.

• Nature vs. Nurture: The interplay between genetic inheritance and environmental factors.

Continuous vs. Discontinuous Development

Development can be viewed as either a gradual, continuous process or as occurring in distinct, discontinuous stages. Continuous development suggests slow, steady progress, while discontinuous development involves rapid changes separated by periods of stability.

• Continuous: Gradual accumulation of skills and abilities.

• Discontinuous: Sudden shifts in abilities, often described as stages.

Physical Development

Reflexes in Infancy

Infants are born with reflexes, which are automatic responses to specific stimuli. These reflexes are essential for survival and indicate normal neurological development.

• Examples: Rooting, sucking, grasping, and Moro reflex.

• Purpose: Help infants interact with their environment and caregivers.

Growth Patterns

Physical growth is rapid in infancy and early childhood, then slows as children mature. Growth includes increases in height, weight, and brain size.

• Rapid Growth: Most pronounced during infancy.

• Slowing Growth: Occurs as children approach adolescence.

Motor Development

Motor development refers to the ability to move and manipulate the body. It follows an orderly sequence, with milestones typically achieved in a predictable order.

• Gross Motor Skills: Involve large muscle groups (e.g., crawling, walking).

• Fine Motor Skills: Involve small muscle groups (e.g., grasping, drawing).

Brain Development

Brain development in early childhood is characterized by the formation and reduction of neuronal connections.

• Blooming: Rapid growth of synaptic connections.

• Pruning: Reduction of unused synaptic connections, increasing efficiency.

Psychosocial Development

Attachment

Attachment is the emotional bond formed between an infant and their caregiver. It is crucial for social and emotional development.

• Secure Attachment: Child feels safe and soothed by caregiver.

• Avoidant Attachment: Child is unresponsive and uninterested in caregiver.

• Resistant Attachment: Child is upset and angry with caregiver.

• Disorganized Attachment: Child displays fearful, dazed, or depressed behavior.

Harlow’s Contact Comfort Study

Harlow’s experiments with monkeys demonstrated the importance of comfort and emotional security in attachment, showing that infants prefer soft, comforting caregivers over those that simply provide food.

Ainsworth’s Strange Situation

Ainsworth developed the Strange Situation procedure to study attachment behaviors by observing children’s reactions to separation and reunion with their caregiver.

Parenting Styles

Parenting styles influence children’s development and behavior. Four main types are identified:

• Authoritative: Reasonable demands, consistent limits.

• Authoritarian: Emphasis on conformity and obedience.

• Permissive: Few demands, little punishment.

• Uninvolved: Indifferent and neglectful.

Erikson’s Psychosocial Theory

Erikson proposed eight stages of psychosocial development, each characterized by a specific crisis or task. Successful resolution leads to competence and healthy personality development.

• Discontinuous: Each stage involves conflict resolution.

Stage	Psychosocial Crisis/Task	What Happens at This Stage?
1	Trust vs. Mistrust	If needs are dependably met, infants develop a sense of basic trust.
2	Autonomy vs. Shame/Doubt	Toddlers learn to exercise will and do things for themselves, or doubt their abilities.
3	Initiative vs. Guilt	Preschoolers learn to initiate tasks and carry out plans, or feel guilty about efforts to be independent.
4	Industry vs. Inferiority	Children learn the pleasure of applying themselves to tasks, or feel inferior.
5	Identity vs. Confusion	Teenagers work at refining a sense of self by testing roles and integrating them to form a single identity, or become confused about who they are.
6	Intimacy vs. Isolation	Young adults struggle to form close relationships and to gain the capacity for intimate love, or feel socially isolated.
7	Generativity vs. Stagnation	Middle-aged adults discover a sense of contributing to the world, usually through family and work, or may feel a lack of purpose.
8	Integrity vs. Despair	When reflecting on their life, the older adult may feel a sense of satisfaction or failure.

Cognitive Development

Piaget’s Theory of Cognitive Development

Jean Piaget proposed that children are active learners who construct knowledge through interaction with their environment. His theory is discontinuous, with distinct stages.

• Schema: Mental model that organizes thought and behavior.

• Assimilation: Incorporating new information into existing schemas.

• Accommodation: Modifying schemas in response to new information.

Piaget’s Stages of Development

• Sensorimotor Stage (0-2 years): Learning through senses and motor exploration. Issues: Object permanence (understanding that objects exist even when not seen), Stranger anxiety.

• Preoperational Stage (2-6 years): Use of words and images to represent things. Issues: Conservation (understanding that quantity remains the same despite changes in shape), Egocentrism (difficulty seeing things from others’ perspectives).

• Concrete Operational Stage (7-11 years): Reasoning about concrete objects and actions.

• Formal Operational Stage (12+ years): Reasoning about abstract ideas.

Theory of Mind

Theory of Mind is the understanding that people have mental states that guide their behavior. It is assessed using tasks like the False Belief Test.

Critiques of Piaget

• Cognitive development is more continuous than Piaget suggested.

• Underestimates infants’ abilities.

• Little room for individual and cultural differences.

Moral Reasoning

Kohlberg’s Stage Theory

Lawrence Kohlberg studied moral reasoning using moral dilemmas and coded responses. He proposed three levels:

• Preconventional: Self-interest and pleasure.

• Conventional: Societal laws and others’ approval.

• Postconventional: Abstract principles and value of life.

Adulthood and Aging

Stages of Adulthood

Adulthood is marked by physical, cognitive, and emotional changes. It is divided into:

• Emerging Adulthood (18 to mid 20s): Identity exploration, focus on work and love.

• Early Adulthood (20s to 40s): Physical abilities peak.

• Middle Adulthood (40s to 60s): Gradual physical decline.

• Late Adulthood (60+): Senses decline, reaction times slow; exercise, nutrition, and active lifestyle are important.

Summary Table: Key Concepts in Developmental Psychology

Domain	Key Concepts
Physical	Reflexes, motor development, brain development (blooming & pruning)
Psychosocial	Attachment, parenting styles, Erikson’s stages
Cognitive	Piaget’s stages, schema, assimilation, accommodation, theory of mind
Moral	Kohlberg’s stages of moral reasoning
Adulthood	Emerging, early, middle, late adulthood