Human Growth and Development
A comprehensive, exam-focused study guide covering every tested topic
Exam Overview
What the Exam Tests
The CLEP Human Growth and Development exam covers material typically taught in a one-semester college course in child psychology, educational psychology, or developmental psychology. It emphasizes development from conception through death, testing knowledge of theories, research methods, and developmental processes across the lifespan.
Content Area Breakdown
- Research Methods & Theories — 8–12%
- Biological Development — 8–12%
- Perceptual & Motor Development — 4–6%
- Cognitive Development — 16–20%
- Language & Communication — 6–8%
- Social & Emotional Development — 20–24%
- Personality Development — 6–8%
- Intelligence — 4–6%
- Atypical Development — 6–8%
- Cultural & Environmental Factors — 6–8%
Research Methods & Theories
8–12%Research Designs
- Cross-sectional — compare different age groups at one point in time; fast and cheap; problem: cohort effects (different generations grew up differently)
- Longitudinal — follow the same group over time; more valid for developmental change; problems: slow, expensive, attrition (dropout), practice effects
- Cross-sequential (cohort-sequential) — combines both; follows multiple cohorts over time; controls for cohort effects while being more efficient than pure longitudinal
- Microgenetic — intensive observation over a short period when change is expected; captures the process of change as it happens
Data Collection Methods
- Naturalistic observation — watch behavior in real settings; high ecological validity; no control over variables
- Structured observation — observe in a controlled lab setting; standardized but less natural
- Self-report / interview — participants describe their own behavior; subject to social desirability bias and memory distortion
- Case study — in-depth study of one individual; rich data but cannot generalize
- Survey — large samples quickly; surface-level data
- Physiological measures — heart rate, brain imaging (fMRI, EEG); objective but expensive
- Habituation paradigm — used with infants; decreased looking time to a repeated stimulus signals learning/memory
Major Theoretical Perspectives
- Psychoanalytic/Psychodynamic (Freud, Erikson) — unconscious drives and early experiences shape development; stage-based
- Behavioral / Social Learning (Watson, Skinner, Bandura) — development shaped by environment, conditioning, and observation
- Cognitive-Developmental (Piaget) — children actively construct knowledge through stages; qualitative changes in thinking
- Information Processing — development as improving memory capacity, attention, speed of processing; no discrete stages
- Ethological / Evolutionary (Lorenz, Bowlby) — behavior shaped by evolution; critical/sensitive periods; attachment as adaptive
- Ecological Systems (Bronfenbrenner) — development shaped by nested environmental systems
- Sociocultural (Vygotsky) — cognitive development driven by social interaction and cultural tools
- Bioecological — integrates biological maturation with ecological context
Key Debates in Developmental Psychology
- Nature vs. nurture — how much is genetic vs. environmental? Modern view: interaction (gene-environment interplay)
- Continuity vs. discontinuity — gradual quantitative change vs. distinct qualitative stages
- Critical vs. sensitive periods — critical = must occur in window (e.g., language in deaf children); sensitive = optimal window but learning can still occur later
- Active vs. passive — do children shape their own development, or are they shaped by forces around them?
- Stability vs. change — do early characteristics persist, or can development change course?
Bronfenbrenner's Ecological Systems Theory
- Microsystem — immediate settings child directly experiences (family, school, peers, neighborhood)
- Mesosystem — interactions between microsystems (e.g., parent-teacher relationship)
- Exosystem — systems that affect child indirectly (parent's workplace, local government policies)
- Macrosystem — broader cultural values, laws, customs, and ideology
- Chronosystem — the dimension of time; historical events and life transitions affect development
Biological Development
8–12%Genetics & Heredity
- Chromosomes — humans have 46 (23 pairs); sex chromosomes: XX (female), XY (male)
- Genes — segments of DNA that code for proteins; dominant vs. recessive inheritance
- Genotype — actual genetic makeup; phenotype — observable characteristics (genotype + environment)
- Polygenic traits — most human traits (height, intelligence, personality) are influenced by many genes
- Heritability — proportion of variance in a trait attributable to genetic differences; does NOT mean % of trait caused by genes in any individual
- Epigenetics — environmental factors that turn genes on or off without changing DNA sequence; explains gene-environment interaction
- Twin studies — identical (MZ) twins share 100% of genes; fraternal (DZ) share ~50%; comparing concordance rates separates genetic from environmental influence
Prenatal Development
- Germinal period (0–2 weeks) — fertilization, cell division, implantation in uterine wall
- Embryonic period (2–8 weeks) — major organs and structures form; most vulnerable to teratogens; heart begins beating around week 4
- Fetal period (8 weeks – birth) — growth and refinement; brain development continues; viability at ~22–24 weeks
- Teratogens — agents that cause birth defects; effect depends on timing, dose, and genetic vulnerability
- Alcohol — most common behavioral teratogen; fetal alcohol spectrum disorder (FASD); no safe amount established
- Other teratogens: tobacco (low birth weight, premature), rubella (heart/eye defects), cocaine, radiation, certain medications
Neonatal Period & Infancy
- Reflexes — automatic responses present at birth: rooting (turns toward touch on cheek), sucking, Moro/startle (spreads arms to sudden movement), Babinski (toe fan), palmar grasp, stepping
- States of arousal — regular sleep, irregular sleep, drowsy, alert, fussing, crying; newborns sleep 16–18 hours/day
- Brain development — at birth, brain is 25% of adult weight; synaptic overproduction (blooming) followed by pruning; myelination continues into early adulthood
- SIDS (Sudden Infant Death Syndrome) — risk reduced by "back to sleep" (supine position), firm mattress, no smoking
Physical Growth Across the Lifespan
- Cephalocaudal — head-to-tail; head develops before lower body
- Proximodistal — center-to-periphery; trunk develops before limbs
- Puberty — maturation of primary and secondary sex characteristics; average onset: girls 8–13, boys 9–14; driven by HPG axis (hypothalamus-pituitary-gonad); secular trend toward earlier onset
- Early vs. late maturation — early maturing girls at risk for depression and eating disorders; early maturing boys initially advantaged socially
- Menopause — cessation of menstruation (~51 years); decline in estrogen; hot flashes, bone density loss
- Aging — skin changes, muscle loss (sarcopenia), bone loss (osteoporosis), reduced immune function, slower reaction time; brain shrinks modestly; fluid intelligence declines but crystallized intelligence maintained
Perceptual & Motor Development
4–6%Perceptual Development in Infancy
- Vision — least developed sense at birth; acuity ~20/400 (legal blindness); prefer faces, high contrast, curved lines; adult-level acuity by ~6–12 months
- Hearing — most developed sense at birth; can hear in womb from ~25 weeks; prefer mother's voice and native language; categorical perception of phonemes
- Smell & taste — functional at birth; prefer sweet, reject bitter/sour; recognize mother's smell within days
- Touch — well-developed at birth; pain perception present; essential for bonding
- Intermodal (cross-modal) perception — ability to integrate information across senses; present from birth; infants recognize by touch objects seen before
- Visual cliff (Gibson & Walk) — apparatus with apparent drop-off; infants 6+ months hesitate, showing depth perception; even younger infants show heart rate changes
- Size/shape constancy — understanding objects stay same size/shape despite changing retinal image; develops in first months
Motor Development
- Gross motor — large muscle control; sequence: roll → sit → crawl → stand → walk (~12 months) → run; universal sequence but timing varies
- Fine motor — small muscle control; palmar grasp → pincer grasp (thumb + forefinger, ~9 months) → drawing → writing
- Dynamic systems theory (Thelen) — motor development emerges from interaction of neurological maturation, body proportions, and environmental opportunities; not a simple unfolding of a genetic program
- Experience-expectant — brain development that requires typical environmental input (light for visual system); universal
- Experience-dependent — brain development driven by specific individual experiences; accounts for individual differences
Perceptual Changes in Adulthood & Aging
- Vision — presbyopia (difficulty focusing on close objects) begins ~40s; cataracts; glaucoma; macular degeneration; reduced dark adaptation
- Hearing — presbycusis (age-related hearing loss); high-frequency sounds lost first; affects speech comprehension; most common sensory impairment in older adults
- Touch/pain — reduced sensitivity; slower pain response; importance for fall risk
- Reaction time — slows with age (neural slowing); affects driving and daily tasks
Cognitive Development
16–20%Piaget's Theory
Children actively construct knowledge through interaction with the environment. Development proceeds through four qualitatively distinct stages; all children pass through in the same order.
- Key processes: schemas (mental frameworks), assimilation (fit new info into existing schema), accommodation (modify schema for new info), equilibration (drive to balance assimilation and accommodation)
- Sensorimotor (0–2) — learns through senses and action; object permanence develops (~8–12 months); deferred imitation by end of stage
- Preoperational (2–7) — symbolic/representational thinking; language explosion; egocentrism (can't take another's perspective — three-mountains task); animism; centration; irreversibility; lack of conservation
- Concrete operational (7–11) — logical thinking about concrete objects; achieves conservation (liquid, mass, number); decentration; reversibility; classification; seriation
- Formal operational (12+) — abstract, hypothetical, systematic thinking; propositional logic; imaginary audience and personal fable (adolescent egocentrism — Elkind)
Vygotsky's Sociocultural Theory
- Zone of Proximal Development (ZPD) — the gap between what a child can do independently and what they can do with guidance from a more skilled person
- Scaffolding — temporary support adjusted to the child's current level; gradually withdrawn as competence grows
- Private speech — children talking to themselves while working; not a sign of immaturity but a cognitive tool; internalizes into inner speech
- Cultural tools — language, writing, number systems; transmit knowledge across generations and shape thinking
- More Knowledgeable Other (MKO) — anyone (adult or peer) who has greater skill in the task
Information Processing Approach
- Views cognitive development as improvements in attention, memory, processing speed, and executive function — no discrete stages
- Working memory — limited capacity short-term store; expands with age through better strategies and automaticity
- Memory strategies: rehearsal (repeating), organization (categorizing), elaboration (connecting to prior knowledge); develop through middle childhood
- Metacognition — thinking about one's own thinking; improves dramatically from ages 5–12; predicts academic success
- Executive function — inhibition, cognitive flexibility, working memory updating; centered in prefrontal cortex; develops through adolescence into early adulthood
- Fuzzy trace theory (Brainerd & Reyna) — memory stored as both verbatim traces (exact) and gist traces (general meaning); gist more resistant to forgetting
Theory of Mind
- Understanding that others have mental states (beliefs, desires, intentions) that differ from one's own
- False belief task (Wimmer & Perner; Sally-Anne task) — child must predict where a character will look for an object moved while they were absent; typically passed at ~4 years
- Children with autism spectrum disorder often struggle with theory of mind tasks
- Linked to language development and social interaction experience
Cognitive Development in Adulthood & Aging
- Fluid intelligence — ability to reason and solve novel problems; peaks in mid-20s, declines gradually with age
- Crystallized intelligence — accumulated knowledge and verbal ability; maintained or increases through middle age, declines only in very late life
- Postformal thought (Labouvie-Vief) — adult thinking that acknowledges ambiguity, contradiction, and context; goes beyond Piaget's formal operations
- Wisdom — rich factual and procedural knowledge about life; expert knowledge system; does not necessarily decline with age
- Normal aging memory changes: slowed processing speed, reduced working memory, episodic memory most affected; semantic and procedural memory relatively preserved
- Dementia vs. normal aging — normal aging: slower but accurate; dementia: impaired daily functioning, significant episodic memory loss, confusion
- Alzheimer's disease — most common dementia; amyloid plaques and neurofibrillary tangles; begins in hippocampus; progressive
Language & Communication
6–8%Language Development Milestones
- Prenatal — fetus responds to mother's voice; learns prosodic patterns of native language
- 0–2 months — cooing (vowel-like sounds)
- 6–8 months — babbling (consonant-vowel repetition: "bababa"); all infants babble similarly, including deaf infants (initially)
- 8–10 months — babbling narrows to native language sounds; joint attention develops
- 10–13 months — first words (holophrases — single word carries sentence meaning)
- 18 months — vocabulary spurt / word explosion (~50 words); fast mapping (learning word after one exposure)
- 18–24 months — two-word telegraphic speech ("want milk," "daddy go")
- 2–3 years — sentences; overregularization errors ("goed," "mouses") — shows rule learning, not imitation
- 3–5 years — complex grammar; 1,000+ words; asks "why"; can tell simple stories
- School age — metalinguistic awareness; reading; understanding ambiguity, humor, idioms
Theories of Language Acquisition
- Behaviorist (Skinner) — language learned through imitation and reinforcement; cannot explain creativity, overregularization, or the speed of acquisition
- Nativist (Chomsky) — Language Acquisition Device (LAD); innate universal grammar; explains universal milestones and critical period
- Interactionist — language emerges from interaction of biological readiness and social experience; Child-Directed Speech (CDS / "motherese") facilitates learning
- Social-pragmatic (Tomasello) — joint attention and intention-reading drive word learning; shared intentionality is uniquely human
Critical Period & Bilingualism
- Critical period hypothesis — there is an optimal window (birth to puberty) for native-like language acquisition; evidence from deaf children given sign language after age 5 and "wild children" (Genie)
- Bilingualism — no cognitive disadvantage; executive function advantages (better inhibitory control); code-switching is normal and not a sign of confusion
- Language and thought — Whorf's linguistic relativity: language influences (not determines) perception and cognition; evidence for weaker version
Language in Adulthood & Aging
- Vocabulary and verbal knowledge continue to grow through middle adulthood
- Older adults experience increased tip-of-the-tongue states; slower word retrieval
- Discourse comprehension relatively preserved; narrative ability maintained
- Hearing loss affects language comprehension in later life
Personality Development
6–8%Freud's Psychosexual Stages
- Oral (0–18 months) — pleasure centered on mouth; feeding; trust in world; fixation → dependency or aggression
- Anal (18 months–3 years) — pleasure in elimination/retention; toilet training; fixation → orderliness or messiness
- Phallic (3–6 years) — pleasure in genitals; Oedipus complex (boys) / Electra complex (girls); identification with same-sex parent; conscience (superego) develops
- Latency (6–puberty) — sexual impulses repressed; focus on skills and peer relationships
- Genital (puberty+) — mature sexual interests; capacity for adult love relationships
Erikson's Psychosocial Stages (full lifespan)
- Trust vs. Mistrust (0–18 months) — consistent caregiving → trust; neglect → mistrust; virtue: hope
- Autonomy vs. Shame & Doubt (18 months–3 years) — independence in toileting/feeding; virtue: will
- Initiative vs. Guilt (3–6 years) — purpose-directed play and exploration; virtue: purpose
- Industry vs. Inferiority (6–12 years) — mastery of academic/social skills; virtue: competence
- Identity vs. Role Confusion (adolescence) — cohesive sense of self; virtue: fidelity
- Intimacy vs. Isolation (young adulthood) — deep relationships; virtue: love
- Generativity vs. Stagnation (middle adulthood) — contributing to society/next generation; virtue: care
- Integrity vs. Despair (late adulthood) — life review; virtue: wisdom
Trait Approaches & Stability
- Big Five (OCEAN) — Openness, Conscientiousness, Extraversion, Agreeableness, Neuroticism; most empirically supported trait model; moderately heritable
- Personality stability — rank-order stability increases with age; mean-level changes: agreeableness and conscientiousness increase; neuroticism decreases through adulthood ("maturity principle")
- Person-situation debate (Mischel) — situational factors are powerful; behavior is less consistent across situations than trait theories predict
- Reciprocal interaction — personality shapes environments people choose, which in turn reinforce personality (niche-picking)
Self-Concept Development
- Rouge test (mirror self-recognition) — self-awareness emerges ~18–24 months; also seen in great apes
- Early childhood — concrete, observable self-descriptions ("I am fast," "I have brown hair"); all-or-nothing thinking
- Middle childhood — trait-like, comparative self-descriptions; social comparison becomes important; self-esteem differentiates by domain
- Adolescence — abstract, psychological self-descriptions; identity exploration; imaginary audience (feeling observed) and personal fable (sense of uniqueness/invulnerability — Elkind)
- Adulthood — stable self-concept; possible selves (images of what one might become); life review in late adulthood
Intelligence
4–6%Theories of Intelligence
- Spearman — general intelligence (g factor) underlies all cognitive abilities; specific abilities (s) are secondary
- Thurstone — 7 primary mental abilities (verbal comprehension, word fluency, numerical ability, spatial visualization, associative memory, perceptual speed, reasoning); no general g
- Cattell-Horn — fluid intelligence (Gf: reasoning with novel problems) vs. crystallized intelligence (Gc: accumulated knowledge); diverge in aging
- Gardner's multiple intelligences — 8+ intelligences: linguistic, logical-mathematical, spatial, musical, bodily-kinesthetic, interpersonal, intrapersonal, naturalist; valued for educational implications; criticized as lacking empirical support for independence
- Sternberg's triarchic theory — analytical (academic problem-solving), creative (novel situations), practical (everyday adaptation); only analytical measured by standard IQ tests
IQ Testing
- Binet & Simon — first practical intelligence test (1905); mental age concept; designed to identify children needing special education
- Stanford-Binet — American adaptation; IQ = (mental age / chronological age) × 100; modern version uses deviation IQ
- Deviation IQ — score relative to same-age peers; mean = 100, SD = 15; ~68% score between 85–115
- Wechsler scales (WPPSI, WISC, WAIS) — most widely used; verbal and performance subtests; yields Full Scale IQ plus index scores
- Reliability — IQ tests are highly reliable (consistent); validity — predict academic and occupational success moderately well
- Flynn effect — IQ scores have risen ~3 points per decade across the 20th century; likely due to improved nutrition, education, test familiarity; has leveled off in some countries
Nature, Nurture, and Group Differences
- Heritability of IQ is moderate in childhood (~50%) and increases to ~70–80% in adulthood
- Adoption studies — children adopted into high-SES homes show significant IQ gains
- Group differences in IQ scores — substantial overlap between groups; differences explained by environmental factors (SES, education access, stereotype threat, test bias) not genetics
- Stereotype threat (Steele) — awareness of negative stereotype impairs test performance; accounts for part of observed group differences
- Intellectual disability — IQ below ~70 with deficits in adaptive behavior; causes: Down syndrome (trisomy 21), Fragile X, PKU, fetal alcohol syndrome, environmental deprivation
- Giftedness — IQ above ~130; Terman's longitudinal study showed gifted children generally healthy and well-adjusted
Atypical Development
6–8%Neurodevelopmental Disorders
- Autism Spectrum Disorder (ASD) — deficits in social communication and interaction; restricted, repetitive behaviors and interests; wide range of severity; 4:1 male:female ratio; onset in early childhood; genetic basis strong; no link to vaccines
- ADHD — inattention and/or hyperactivity-impulsivity; most common neurodevelopmental disorder; boys diagnosed more; persists into adulthood in ~60%; responds to stimulant medication (methylphenidate) and behavioral intervention
- Specific learning disabilities — dyslexia (reading), dyscalculia (math), dysgraphia (writing); average or above-average intelligence; neurological basis; require differentiated instruction
- Intellectual disability — IQ below ~70 + adaptive behavior deficits; mild (most common), moderate, severe, profound; Down syndrome = most common chromosomal cause
Internalizing & Externalizing Problems
- Internalizing — directed inward: anxiety disorders, depression, somatic complaints, social withdrawal; more common in girls
- Externalizing — directed outward: aggression, conduct disorder, oppositional defiant disorder; more common in boys
- Childhood depression — often manifests as irritability rather than sadness; frequently co-occurs with anxiety; underdiagnosed
- Conduct disorder — persistent pattern of violating others' rights and social norms; risk factor for antisocial personality disorder in adulthood; associated with low empathy, harsh parenting, peer deviance
- Childhood anxiety — separation anxiety disorder, generalized anxiety, selective mutism, specific phobias; often first emerge in early to middle childhood
Risk, Resilience & Protective Factors
- Risk factors — poverty, maltreatment, parental mental illness, prenatal substance exposure, neighborhood violence, poor schools
- Resilience — positive adaptation despite significant adversity; not a fixed trait but a process
- Protective factors — secure attachment to at least one caring adult, easy temperament, high intelligence, strong self-efficacy, supportive school environment, community resources
- Child maltreatment — physical, sexual, emotional abuse and neglect; consequences: insecure attachment, aggression, depression, PTSD, cognitive delays; neglect is most common and often most damaging form
- Kauai longitudinal study (Werner & Smith) — followed high-risk children from birth; ~1/3 became competent, caring adults despite adversity — emphasized resilience and protective factors
Cultural & Environmental Factors
6–8%Parenting Styles
Baumrind's parenting styles — two dimensions: demandingness (control) and responsiveness (warmth):
- Authoritative — high demandingness + high responsiveness; firm limits with warmth and explanation; best outcomes across cultures for social competence, self-esteem, academic achievement
- Authoritarian — high demandingness + low responsiveness; strict rules, little warmth, obedience expected; associated with obedient but lower self-esteem children; more normative in collectivist cultures
- Permissive (indulgent) — low demandingness + high responsiveness; warm but few limits; associated with impulsivity, low persistence
- Uninvolved (neglectful) — low demandingness + low responsiveness; worst outcomes; associated with all domains of poor adjustment
Family Structure & Context
- Birth order — firstborns often higher achievers; later-borns often more sociable and open to experience; large family size associated with lower IQ scores (resource dilution)
- Divorce — short-term disruption common; long-term outcomes depend more on quality of post-divorce parenting and co-parenting than on divorce itself; high parental conflict most damaging
- Single-parent families — higher poverty risk; outcomes mediated by economic resources, social support, and parenting quality
- Nonparental care / childcare — quality and stability matter more than type; high-quality early childcare associated with cognitive gains; NICHD study showed hours matter for behavioral outcomes
- Siblings — provide socialization opportunities; sibling conflict teaches negotiation; older sibling tutoring benefits both parties
Socioeconomic Status & Poverty
- SES is one of the strongest predictors of developmental outcomes — cognitive, health, social
- Mechanisms: reduced access to books/stimulation, poorer nutrition, higher stress, less stable housing, lower-quality schools, fewer enrichment activities
- Cumulative risk — multiple simultaneous risk factors are far more damaging than any single risk factor alone
- Language gap (Hart & Risley) — children from low-SES families hear 30 million fewer words by age 3 than high-SES peers; predicts later vocabulary and reading achievement
- Intervention programs — Head Start, Perry Preschool Project, Abecedarian Project; high-quality early intervention shows lasting academic and social benefits; ROI strongest for earliest interventions
Culture, Ethnicity & Gender
- Culture shapes developmental norms, goals, and pathways — e.g., age of independence, sleeping arrangements, educational expectations
- Individualism vs. collectivism — affects self-concept, parenting, moral reasoning, and definitions of academic success
- Gender development — gender identity stable by ~3 years; gender stereotypes and preferences emerge by age 2–3; socialization and cognitive factors both contribute
- Gender schema theory (Bem) — children use gender as an organizing schema for understanding the world; influences what they attend to and remember
- Media and technology — screen time effects on attention, sleep, and social development; social media linked to body image concerns and depression in adolescent girls
Key Theorists
Key Terms
Video Resources
Modern States – Human Growth & Development
Full free CLEP-aligned course covering the complete lifespan. Best single free resource.
FREE CLEP COURSECrashCourse Psychology (PBS)
40-episode YouTube series — covers developmental psychology topics in depth with clear visuals.
YOUTUBE SERIESKhan Academy – Human Development
Free videos on prenatal development, infancy, childhood, and adolescence.
FREEMr. Sinn – AP Psychology
Clear, exam-focused YouTube videos on developmental psychology aligned with CLEP content.
YOUTUBEPowerhouse Prep – Free Practice Tests
Free CLEP Human Growth & Development practice tests and targeted study guides.
FREE PRACTICECLEP HGD Study Videos on YouTube
Search YouTube for targeted exam reviews, mnemonics, and stage breakdowns specific to this exam.
YOUTUBEPractice Exam — 200 Questions
Click any question to reveal the answer and explanation.
Social & Emotional Development
20–24%Emotional Development in Infancy
Temperament
Attachment
Peer Relationships & Play
Adolescent Social Development
Social Development in Adulthood