Psychologists focus on understanding human growth and change across three primary domains:
Physical development: refers to bodily changes and the brain
Cognitive development: encompasses thinking, learning, problem solving, and memory
Socio-emotional development: includes social and emotional growth throughout the lifespan.
Universality vs. Cultural Influences
Some elements of human development are universal, however, factors such as culture can significantly influence others.
Example: Timing and manner in which individuals leave home or secure employment can differ culturally.
Definition of Development
"Development refers to the age-related changes that occur in our bodies, minds, and social functioning from conception to death."
Developmental psychologists study variations between individuals with unique backgrounds and typical patterns.
Domains of Development
Physical Development: Changes in the bodily structures and functions.
Cognitive Development: Encompasses the processes of thinking, problem solving, and memory formation.
Socio-Emotional Development: Involves the growth of social skills and emotional understanding.
Nature and Nurture
Modern psychology emphasizes both nature (genes) and nurture (environment) in development, rather than viewing them as opposing factors.
Example of interaction:
Individual genetically predisposed to addiction (nature) may not develop a substance abuse disorder if placed in a non-abusive environment (nurture).
Developmental Processes
Stages vs. Continuous Development:
Some developmental aspects occur in distinct stages (e.g., learning to walk) while others develop steadily over time (e.g., language acquisition).
Developmental psychologists employ various research designs to study this growth across time.
Research Methods in Developmental Psychology
Cross-sectional Method: Compares different age groups at one point in time.
Example: Studying memory in five, ten, and fifteen-year-olds simultaneously.
Longitudinal Method: Tracks the same individual across a lengthy period.
Example: Monitoring emotional regulation from ages five to twenty-five.
Cross-sequential Method: Combines both cross-sectional and longitudinal designs, observing multiple age groups over time.
Prenatal Development
Approximately 20% of pregnancies end in miscarriage, often due to genetic anomalies.
Prenatal periods are divided into three stages:
Germinal Stage: Lasts until about 14 days after conception.
Embryonic Stage: Occurs from the third to the eighth week.
Fetal Stage: Last from the ninth week until birth.
Age of viability is reached at 24 weeks: infant can possibly survive outside the womb.
Importance of a Safe Prenatal Environment
Developing babies need a secure environment, free of potential dangers.
Exposure to teratogens (agents causing birth defects) should be avoided.
Teratogenic Effects: Most pronounced during the embryonic stage.
Certain teratogens (e.g., drugs, alcohol, radiation) can be avoided while others cannot.
Alcohol and nicotine consumption during pregnancy can lead to severe consequences.
Example: No safe amount of alcohol is recommended during pregnancy due to risk of fetal alcohol syndrome, which affects motor skills and attention.
Sensory Development at Birth
Newborns are born with all five sensory systems functioning, but vision is the least developed.
Initial focus range is 8-10 inches.
Visual preferences develop shortly after birth.
Infants' hearing is highly developed, able to distinguish their mother's voice in the womb.
Babies can recognize the smell of their mother's milk by day three.
The idea that newborns cannot feel pain has been disproven; they have similar brain responses to pain as adults.
Reflexes and Motor Skills
Infants exhibit reflexes, which may either diminish or persist over time.
Reflexes play a role in developing voluntary motor skills like crawling and walking.
Major growth in neural connections occurs between ages three and six, particularly in the frontal lobes, linked to planning and attention.
Synaptic connections decrease by 40-50% by puberty.
Language Development
Language acquisition follows predictable stages across cultures.
Piaget's model of cognitive development is widely recognized, involving:
Assimilation: Understanding new information using existing schemas.
Accommodation: Restructuring current schemas to integrate new information.
Example: Child sees a large cat and calls it a puppy, demonstrating assimilation. After correction, accommodation occurs to form an accurate schema.
Piaget's Stages of Cognitive Development
Sensorimotor Stage (0-2 years): Focus on sensory and motor interactions; lacking object permanence.
Object permanence is realizing that things exist even if unseen.
Preoperational Stage (2-7 years): Development of symbolic thinking and language but limited understanding (e.g., egocentrism and lack of conservation).
Egocentrism: Inability to see things from others' perspectives.
Conservation: Understanding that quantity remains the same despite changes in arrangement or appearance.
Concrete Operational Stage (7-12 years): Logical thinking develops but limited to concrete situations.
Formal Operational Stage (12 and onwards): Involving abstract and hypothetical reasoning.
New questions like "What if…" emerge during this stage.
Vygotsky's Sociocultural Theory
Lev Vygotsky emphasized the role of social interactions in cognitive development.
Zone of Proximal Development (ZPD): The difference between what a child can do independently and what they can achieve with guidance.
Scaffolding: The support given to help children achieve tasks just beyond their current abilities while gradually withdrawn as competence increases.
Temperament
Concept of temperament includes characteristic styles of interaction and emotional expression.
Based on models such as easy, difficult, and slow-to-warm types.
Jerome Kagan's research assessed reactivity through physiological and behavioral measures.
Attachment Styles
Mary Ainsworth's Strange Situation experiment identified four attachment styles:
Secure Attachment (70%): Mild distress when separated but easily comforted upon return.
Resistant Attachment (15%): No stress when left but showing little engagement with caregivers upon return.
Ambivalent Attachment (15%): Upset and clinging to caregivers but also resistant to comfort.
Disorganized Attachment (4%): Exhibiting conflicting behaviors; linked with psychological risks.
Harlow's Studies on Attachment
Harry and Margaret Harlow studied infant monkeys and found they preferred comfort over food, illustrating the importance of physical affection for attachment.
Erikson's Psychosocial Development Stages
Eight stages characterized by crises to overcome leading to a healthier personality:
Trust vs. Mistrust (0-1 year): Dependence on caregivers, forming foundation for trust.
Autonomy vs. Shame/Doubt (1-3 years): Encouraging exploration fosters independence.
Initiative vs. Guilt (3-6 years): Encouragement vs. criticism impacts confidence in social situations.
Industry vs. Inferiority (6 years-puberty): Self-esteem built through peer comparisons and accomplishments.
Identity vs. Role Confusion (12-18 years): Exploring self-concept leads to stronger identity or confusion.
Intimacy vs. Isolation (18-40 years): Forming meaningful relationships; failure leads to isolation.
Generativity vs. Stagnation (40-65 years): Contributing to society through work or relationships; failure leads to stagnation.
Integrity vs. Despair (65 years onwards): Reflecting on life with a sense of fulfillment versus regret.
Baumrind's Parenting Styles
Diana Baumrind identified four parenting styles based on responsiveness and control:
Authoritarian: High control, low warmth.
Authoritative: High control, high warmth; fosters independence.
Permissive: Low control, high warmth; few demands placed on children.