AP Psychology: Comprehensive Lifespan Development

Comprehensive practice flashcards for AP Psychology covering developmental psychology themes, research methodology, prenatal influences, motor and physical milestones, cognitive theories (Piaget and Vygotsky), language acquisition, ecological systems theory, parenting, attachment, Eriksonian psychosocial stages, identity statuses, and gender development.

Developmental Psychology

The scientific study of the systematic changes that occur in human beings over the course of their lives, from conception to death, encompassing physical, cognitive, emotional, and social growth.

Stability vs. Change Debate

A foundational debate in developmental psychology examining whether core personality traits and behaviors remain consistent across the lifespan or fundamentally shift due to experiences, relationships, and choices.

Nature vs. Nurture Debate

The debate concerning whether human development and behavior are primarily determined by biological and genetic inheritance (nature) or environmental experiences and upbringing (nurture).

Epigenetics

The study of how environmental factors and life experiences alter gene expression without altering the underlying DNA sequence.

Continuous Development

The perspective that developmental growth is a smooth, gradual, and cumulative process (the 'Ramp Model') where skills accumulate steadily over time.

Discontinuous Development

The perspective that growth occurs in distinct, qualitatively different, step-like stages (the 'Staircase Model'), where each stage represents a fundamentally new level of ability or thinking.

Cross-Sectional Research

A research design that compares groups of people of different ages simultaneously at a single point in time.

Longitudinal Research

A research design that repeatedly studies and follows the same group of individuals over an extended period of months, years, or decades to track genuine individual change.

Cohort Effect

A research limitation where differences between age groups arise because they grew up in different historical eras and environmental contexts rather than because of chronological age.

Participant Attrition

The loss of participants over time in a longitudinal study due to dropping out, relocating, or passing away, which can skew research findings.

Germinal Stage

The first prenatal stage spanning $0\text{ to }2$ weeks from conception, characterized by rapid zygotic cell division, movement down the fallopian tube, and implantation in the uterine wall alongside early placental formation.

Embryonic Stage

The second prenatal stage occurring from $2\text{ to }8$ weeks, during which all major organ systems (heart, brain, limbs, spinal cord) form, marking the period of greatest vulnerability to teratogens.

Fetal Stage

The final prenatal stage extending from $8$ weeks until birth, characterized by rapid physical growth, refinement of organs, rapid brain maturation, and emerging sensory responsiveness.

Teratogen

Any environmental agent—such as a drug, chemical, virus, or radiation—that can cause harm or abnormal structural and functional development to an embryo or fetus.

Fetal Alcohol Spectrum Disorders (FASD)

A cluster of permanent physical, behavioral, and cognitive abnormalities caused by maternal alcohol consumption during pregnancy, representing the leading preventable cause of intellectual disability.

Cephalocaudal Principle

The developmental pattern stating that physical growth and motor control proceed from head to toe, meaning infants gain control of their heads and upper bodies before their legs and feet.

Proximodistal Principle

The developmental pattern stating that physical growth and motor control proceed from the center of the body outward to the extremities, meaning trunk control develops before limb and finger control.

Gross Motor Skills

Physical abilities involving large muscle groups of the arms, legs, and core used for locomotion and posture, such as rolling, sitting, crawling, and walking.

Fine Motor Skills

Precise, coordinated physical movements involving small muscle groups, particularly the hands and fingers, such as grasping, stacking blocks, and writing.

Pincer Grasp

A fine motor milestone emerging around $8\text{ to }10$ months that involves coordinating the index finger and thumb to pick up small objects.

Rooting Reflex

An involuntary newborn reflex where touching an infant's cheek causes them to automatically turn their head toward the stimulus and open their mouth to locate food.

Moro Reflex

An automatic startle reflex in infants triggered by sudden movement or loud noises, characterized by spreading the arms outward and then pulling them back in.

Babinski Reflex

An infant reflex where stroking the sole of the foot causes the toes to fan outward; it normally disappears by age $2$, with its presence in adulthood indicating potential neurological dysfunction.

Visual Cliff

An experimental apparatus developed by Eleanor Gibson and Richard Walk (1960) featuring a glass-topped drop-off used to demonstrate that crawling infants possess depth perception.

Critical Period

A strict, biologically defined developmental window during which specific environmental experiences must occur for an ability (such as binocular vision) to develop normally.

Sensitive Period

A broader, flexible window of development during which the brain is especially receptive to certain learning experiences (such as language acquisition from birth to age $7$), though learning can still occur later with greater difficulty.

Imprinting

A rapid, instinctive, and irreversible bonding process observed in certain non-human animals (demonstrated by Konrad Lorenz with goslings) that occurs with the first moving object encountered during a critical period after birth.

Adolescent Growth Spurt

A rapid increase in height and weight during adolescence driven by growth hormone and sex hormones (estrogen and testosterone), occurring between ages $10\text{--}14$ in females and $12\text{--}16$ in males.

Puberty

The biological maturation process triggered by the hypothalamus signaling the pituitary gland to release hormones activating the gonads, culminating in the capacity for sexual reproduction.

Primary Sex Characteristics

Internal and external reproductive structures directly required for sexual reproduction, such as ovaries, testes, uterus, and penis.

Secondary Sex Characteristics

Non-reproductive physical indicators of sexual maturity that emerge during puberty, such as breast development, voice deepening, body hair, and changes in body contours.

Menarche

The occurrence of a female's first menstrual period, signaling reproductive maturity during puberty.

Spermarche

The first occurrence of sperm production and ejaculation in adolescent males, marking a milestone of reproductive maturity.

Menopause

The biological cessation of menstruation and reproductive capability in females, typically occurring between ages $45\text{ and }55$ as estrogen and progesterone levels decline.

Andropause

The gradual decline in testosterone levels in males beginning around age $30$, resulting in changes in muscle mass, energy, and mood while maintaining reproductive capacity.

Sarcopenia

The age-related, progressive loss of skeletal muscle mass and strength that occurs in adulthood.

Presbyopia

The age-related decline in visual accommodation, typically beginning in the mid-$40\text{s}$, that impairs the eye's ability to focus on close objects.

Presbycusis

The gradual, age-related loss of hearing acuity across adulthood, particularly affecting the perception of high-frequency sounds.

Schema

A mental framework or organizational structure that the brain uses to categorize, store, and interpret information about the world.

Assimilation

The cognitive process of incorporating new information and experiences into preexisting schemas without altering the schemas themselves.

Accommodation

The cognitive process of modifying or creating new schemas when new information cannot fit into existing mental frameworks.

Sensorimotor Stage

Piaget's first cognitive developmental stage (ages $0\text{ to }2$), during which infants explore and make sense of their environment primarily through sensory impressions and motor actions.

Object Permanence

The cognitive understanding, typically mastered between $8\text{ and }12$ months, that objects continue to exist even when they can no longer be seen, heard, or touched.

Preoperational Stage

Piaget's second cognitive developmental stage (ages $2\text{ to }7$), marked by rapid language expansion, pretend play, and symbolic representation, alongside logical limitations such as egocentrism and lack of conservation.

Conservation

The cognitive understanding that core physical properties of an object (such as volume, mass, or number) remain identical despite superficial transformations in its outward shape or appearance.

Reversibility

The cognitive ability to mentally undo a sequence of actions or reverse an operation back to its original state.

Animism

A characteristic of preoperational thought where children believe inanimate objects possess lifelike qualities, feelings, consciousness, and intentions.

Egocentrism

The inability of young children in the preoperational stage to perceive situations or the physical world from perspectives other than their own (illustrated by the Three Mountains Task).

Theory of Mind

The developmental ability, typically developing around ages $4\text{--}5$ and assessed via the false-belief task, to understand that others hold independent beliefs, desires, and perspectives different from one's own.

Concrete Operational Stage

Piaget's third cognitive stage (ages $7\text{ to }11$), during which children develop logical, systematic thinking regarding tangible, concrete objects and master conservation, reversibility, and hierarchical classification.

Formal Operational Stage

Piaget's final cognitive stage (beginning around age $12$), characterized by the capacity for abstract reasoning, hypothetical thinking, and systematic, scientific hypothesis testing.

Zone of Proximal Development (ZPD)

Lev Vygotsky's concept representing the gap between what a learner can achieve independently and what they can accomplish when guided by a more knowledgeable other.

Scaffolding

Temporary instructional support tailored to a learner's current competence level within their ZPD, which is gradually withdrawn as independent mastery develops.

Piaget vs. Vygotsky

The comparison between Piaget's theory of biological maturation through universal discontinuous stages with children as solo explorers and Vygotsky's sociocultural view of learning as a continuous social process where language shapes thought.

Crystallized Intelligence

An individual's accumulated factual knowledge, verbal comprehension, and expertise gained through education and life experience, which remains stable or improves across adulthood.

Fluid Intelligence

The capacity to reason abstractly, process information rapidly, and solve novel problems independently of acquired knowledge, which typically peaks in early adulthood and declines with age.

Dementia

A progressive neurological disorder characterized by abnormal cognitive decline in memory, problem-solving, and language sufficient to impair daily functioning (with Alzheimer's disease causing $60\text{--}80\%$ of cases).

Phonemes

The smallest distinctive units of sound in a spoken language (English contains approximately $44$ phonemes) that distinguish one word from another.

Morphemes

The smallest units of language that carry meaning, including stand-alone words (free morphemes) and prefixes/suffixes like '-ing' and '-ed' (bound morphemes).

Semantics

The subfield of linguistics that studies the meaning of words, phrases, and sentences in context.

Syntax

The structural rules governing word order and the arrangement of words into grammatically meaningful phrases and sentences.

Generativity (Linguistic)

The unique characteristic of human language that allows speakers to produce and understand an infinite number of novel sentences from a finite set of words and rules.

Cooing

The initial vocal stage of language development ($0\text{ to }4$ months) involving soft, repetitive vowel-like sounds ('ooh', 'aah') produced in social response to caregivers.

Babbling

The second stage of language development ($4\text{ to }10$ months) characterized by rhythmic consonant-vowel combinations ('ba-ba-ba'); exhibited vocally by hearing infants and manually via signs by deaf infants.

Holophrase

A single-word utterance used during the one-word stage ($10\text{ to }18$ months) that conveys the meaning of an entire sentence depending on context and intonation.

Telegraphic Speech

Two- or three-word speech patterns emerging around $18\text{ to }24$ months consisting primarily of high-content nouns and verbs arranged in correct syntactic order ('want cookie').

Overgeneralization

A grammatical speech error (such as saying 'goed' or 'foots') where a child incorrectly applies a standard grammatical rule to an irregular word, demonstrating active rule acquisition.

Sapir-Whorf Hypothesis

The linguistic relativity theory stating that the structural properties and vocabulary of a language influence or constrain the cognitive perceptions and thought patterns of its speakers.

Ecological Systems Theory

Urie Bronfenbrenner's model proposing that human development is shaped by multiple nested, interlocking environmental systems ranging from immediate face-to-face contacts to broad cultural blueprints.

Microsystem

The innermost layer of Bronfenbrenner's ecological model comprising the direct, immediate settings and relationships an individual interacts with face-to-face daily (family, peers, school).

Mesosystem

The second layer of Bronfenbrenner's model consisting of the interconnections and relationships between two or more settings in an individual's microsystem (e.g., parent-teacher communication).

Exosystem

The environmental settings in Bronfenbrenner's model that do not directly involve the developing individual but indirectly influence them (e.g., parental workplace policies, local community budgets).

Macrosystem

The outermost, overarching layer of Bronfenbrenner's model encompassing cultural values, laws, economic structures, and social ideologies that shape all inner systems.

Chronosystem

The temporal dimension of Bronfenbrenner's ecological framework capturing how life transitions, developmental timing, and historical events impact individual development over time.

Authoritarian Parenting

A parenting style characterized by high demands and strict rules coupled with low emotional warmth, where absolute obedience is expected without explanation.

Authoritative Parenting

A parenting style defined by high behavioral standards alongside high emotional warmth and open communication, associated with the most positive developmental outcomes in Western cultures.

Permissive Parenting

A parenting style characterized by high emotional warmth and responsiveness but low control, few boundaries, and minimal expectations.

Secure Attachment

An attachment classification from Ainsworth's Strange Situation in which an infant uses the caregiver as a secure base, exhibits distress upon separation, and is easily comforted upon reunion.

Insecure-Avoidant Attachment

An attachment classification characterized by an infant's apparent indifference toward the caregiver, displaying minimal distress during separation and avoiding contact upon reunion.

Insecure-Anxious (Ambivalent) Attachment

An attachment classification where an infant shows intense distress upon separation and responds to reunion with ambivalent behaviors, simultaneously seeking closeness and pushing the caregiver away.

Disorganized Attachment

An attachment pattern where an infant displays confused, contradictory, or fearful responses upon the caregiver's return, often linked to neglectful or frightening caregiving.

Contact Comfort

Harry Harlow's experimental finding with infant rhesus monkeys establishing that attachment bonds are fundamentally driven by physical warmth and soft tactile comfort rather than nourishment.

Separation Anxiety

A developmentally normal distress reaction peaking between $8\text{ and }14$ months when an infant is separated from primary attachment figures.

Parallel Play

A stage of early childhood play in which children play side by side with similar materials without directly interacting or coordinating their activities.

Imaginary Audience

A form of adolescent egocentrism identified by David Elkind involving the distorted belief that others are constantly observing, monitoring, and evaluating one's appearance and actions.

Personal Fable

A facet of adolescent egocentrism characterized by the belief that one's personal experiences and feelings are completely unique and that one is invulnerable to harm.

Social Clock

Bernice Neugarten's concept describing culturally defined social norms and expected timetables for achieving major life milestones such as marriage, parenthood, and retirement.

Emerging Adulthood

A transitional developmental period proposed by Jeffrey Arnett spanning roughly ages $18\text{ to }25$, characterized by identity exploration, instability, and self-focus prior to assuming adult roles.

Psychosocial Stages of Development

Erik Erikson's eight-stage lifespan theory positing that psychological development continues across the entire life course, with each stage defined by a central crisis or conflict.

Trust vs. Mistrust

Erikson's first psychosocial stage (birth to $18$ months), where responsive caregiving fosters basic trust in the world, while neglect or inconsistency creates underlying mistrust.

Autonomy vs. Shame & Doubt

Erikson's second stage ($18$ months to $3$ years), centered on toddlers establishing personal control and independent choices versus experiencing self-doubt and shame from overcontrol.

Initiative vs. Guilt

Erikson's third stage ($3\text{ to }5$ years), where children develop purpose by planning play and initiating tasks, while excessive criticism leads to guilt over wanting things.

Industry vs. Inferiority

Erikson's fourth stage ($6\text{ to }12$ years), in which children cultivate feelings of competence and mastery through academic and social skills, or feel inferior if they feel incapable compared to peers.

Identity vs. Role Confusion

Erikson's fifth stage ($12\text{ to }18$ years), where adolescents explore values, roles, and beliefs to form a coherent personal identity, with failure resulting in role confusion.

Intimacy vs. Isolation

Erikson's sixth stage ($18\text{ to }40$ years), focused on developing committed, loving relationships with others without losing one's own identity.

Generativity vs. Stagnation

Erikson's seventh stage ($40\text{ to }65$ years), centered on contributing to future generations through parenting, teaching, work, or mentorship versus feeling unproductive and self-absorbed.

Integrity vs. Despair

Erikson's eighth stage ($65+$ years), where older adults look back on life with a sense of fulfillment and acceptance versus experiencing regret and despair that time has run out.

Adverse Childhood Experiences (ACEs)

Potentially traumatic events occurring before age $18$—including abuse, neglect, and household dysfunction—linked to lasting neurobiological alterations and lifelong health and relational vulnerabilities.

Identity Achievement

James Marcia's identity status characterized by high exploration and high commitment, where an individual has actively explored alternatives and made autonomous commitments.

Identity Diffusion

James Marcia's identity status characterized by low exploration and low commitment, where an individual has not explored options and avoids committing to values or goals.