Atkinson & Hilgard's Introduction to Psychology - Vocabulary Review

Comprehensive review of 200 key vocabulary terms and foundational concepts across all major chapters of Atkinson & Hilgard's Introduction to Psychology (16th Edition).

Psychology

The scientific study of behavior and mental processes.

Prosopagnosia

A condition resulting from damage to a specific region on the right side of the brain in which a person is unable to recognize familiar faces while performing other tasks normally.

Fundamental Attribution Error

The pervasive tendency when explaining other people's behavior to overestimate the causal effect of personality or dispositional traits and underestimate the influence of situational factors.

Childhood Amnesia

The phenomenon wherein most adults cannot accurately recall personal memories or events from the first three years of life.

Law of Effect

A fundamental principle of learning theory stating that any behavior followed by a reward or reinforcing consequence is strengthened.

Overjustification Effect

The phenomenon where explaining one's own behavior with excessive emphasis on salient situational causes, such as external rewards, undermines intrinsic interest.

Nature-Nurture Debate

The ongoing psychological and philosophical debate over whether human capabilities are inborn (nature) or acquired through experience and interaction with the world (nurture).

Tabula Rasa

The view proposed by John Locke that human beings enter the world as a 'blank slate' on which experience writes knowledge and understanding.

Associationist Psychology

An early psychological perspective proposing that the mind fills with ideas that enter via the senses and become connected through principles such as similarity and contrast.

Introspection

The method of observing and recording the nature of one's own perceptions, thoughts, and conscious feelings under controlled experimental conditions.

Structuralism

An early school of psychology originated by E. B. Titchener focused on analyzing complex conscious experiences into their basic mental elements and structures.

Functionalism

An early psychological approach associated with William James that emphasizes understanding how the fluid mind works to enable an organism to adapt to its environment.

Behaviorism

A school of psychology founded by John B. Watson that restricts psychological inquiry to public, observable behavior and rejects the study of consciousness.

Gestalt Psychology

A school of psychology founded by Max Wertheimer, Kurt Koffka, and Wolfgang Köhler asserting that perceptual experiences depend on patterns of stimuli and that the whole is different from the sum of its parts.

Psychoanalysis

A theory of personality and method of psychotherapy originated by Sigmund Freud, which places unconscious impulses, wishes, and childhood conflicts at the center of human behavior.

The Unconscious (Freudian)

The reservoir in the mind containing thoughts, attitudes, impulses, wishes, and emotions that are driven out of conscious awareness but continue to influence thoughts and actions.

Free Association

A therapeutic method in which the patient is instructed to say whatever comes to mind without censorship to bring unconscious wishes and memories into conscious awareness.

Information-Processing Model

A cognitive framework that conceptualizes human beings as processors of information, using computer simulations and flow of data as analogies for mental processes.

Biological Perspective

A contemporary approach that seeks to explain overt behavior and mental processes in terms of underlying neurobiological, electrical, and chemical events in the body.

Behavioral Perspective

An approach in psychology that focuses strictly on observable environmental stimuli and behavioral responses, explaining actions through conditioning and reinforcement.

Cognitive Perspective

A contemporary approach concerned with mental processes such as perceiving, remembering, reasoning, deciding, and problem-solving, and their relationship to behavior.

Subjectivist Perspective

An approach contending that human behavior is a function of the perceived, actively constructed world rather than the objective world.

Naïve Realism

The cognitive tendency of individuals to take their constructed, subjective realities to be faithful, direct renderings of an objective world.

Reductionism

The scientific effort to reduce psychological concepts and principles to their underlying biological and physiological counterparts.

Cognitive Neuroscience

An interdisciplinary approach combining cognitive psychology and neuroscience to study how mental activities are executed in the brain.

Evolutionary Psychology

A field that investigates how human psychological mechanisms have evolved over millions of years through natural selection to enhance ancestral survival and reproductive success.

Cultural Psychology

An interdisciplinary study of how an individual's culture, including traditions, language, and worldview, shapes mental representations and psychological and neural processes.

Behavioral Epigenetics

The study of the biological mechanisms through which personal traits and behaviors adapt to shifts in environmental experiences across a lifespan through changes in gene expression.

Neuroplasticity

The capacity of the nervous system and brain structures to change and reorganize in response to environmental experiences and learning.

Phenotypic Plasticity

The biological property referring to the capacity of experiences to change gene expression at cellular levels throughout the body and brain.

Independent Variable

In an experiment, the variable precisely created, manipulated, and controlled by the investigator, representing the hypothesized cause.

Dependent Variable

In an experiment, the measured variable representing the hypothesized effect, which depends on changes in the independent variable.

Random Assignment

A procedure for assigning participants to experimental and control conditions such that each participant has an equal probability of being placed in any group.

Correlation Coefficient

A descriptive statistic symbolized by $r$, ranging from $-1.00$ to $+1.00$, that estimates the degree and direction of relationship between two variables.

Meta-Analysis

A systematic form of literature review in which investigators use statistical techniques to combine and draw conclusions across a large group of prior studies.

Minimal Risk

The ethical principle that the risks anticipated in a psychological study should be no greater than those ordinarily encountered in daily life.

Informed Consent

An ethical principle requiring that participants be told beforehand of any study features that might affect willingness to participate and enter voluntarily with freedom to withdraw.

Debriefing

The ethical requirement that participants be given an explanation of the study's procedures and reasons for any deception as soon as possible after participation.

Central Nervous System (CNS)

The division of the nervous system that includes all neurons located in the brain and the spinal cord.

Peripheral Nervous System (PNS)

The division of the nervous system consisting of all nerves and neural tissue connecting the brain and spinal cord to the rest of the body.

Somatic System

The subdivision of the peripheral nervous system that carries messages to and from the sense receptors, muscles, and body surface for voluntary and conscious actions.

Autonomic Nervous System (ANS)

The subdivision of the peripheral nervous system that connects with internal organs and glands, regulating automatic and involuntary bodily functions.

Afferent Nerves

Sensory nerve fibers that carry incoming neural signals from the body's receptors to the central nervous system.

Efferent Nerves

Motor nerve fibers that carry outgoing neural commands from the central nervous system to the muscles and glands of the body.

Neuron

A specialized cell that transmits neural impulses or messages to other neurons, glands, and muscles.

Dendrites

Short, branched extensions projecting from the soma of a neuron that receive chemical and neural impulses from adjacent neurons.

Axon

A slender, tubelike extension extending from the neuronal soma that conducts electrochemical impulses away from the cell body toward other neurons.

Terminal Buttons

Small swellings at the end of axon branches containing synaptic vesicles that store and release neurotransmitters into the synaptic gap.

Synapse

The functional junction between the terminal button of a presynaptic neuron and the membrane of a postsynaptic neuron.

Neurotransmitter

A chemical messenger released into the synaptic gap by a terminal button that diffuses across the space to bind to postsynaptic receptors.

Glial Cells

Non-neural support cells in the nervous system that insulate axons, hold neurons in place, supply nutrients, clean up waste, and aid signal transmission.

Action Potential

A rapid traveling electrochemical impulse caused by depolarization that moves from the cell body along the axon to the terminal buttons.

Resting Potential

The electrical potential across a neuron's cell membrane when at rest, typically maintaining the inside at about $-70\,\text{mV}$ relative to the outside.

Excitation Threshold

The critical membrane potential (typically around $-55\,\text{mV}$) above which a neuron's membrane becomes temporarily unstable and fires an action potential.

All-or-None Law

The biological principle that a neuron either fires an action potential at full magnitude or does not fire at all in response to stimulation.

Nodes of Ranvier

Tiny gaps between adjacent myelin sheath segments along an axon where action potentials regenerate during saltatory conduction.

Saltatory Conduction

The rapid transmission of an action potential jumping from one node of Ranvier to the next along a myelinated axon.

Reuptake

The process by which neurotransmitters in the synaptic gap are reabsorbed back into the presynaptic terminal buttons that released them.

Acetylcholine

A neurotransmitter prevalent in the hippocampus and at every motor junction, involved in memory formation and skeletal muscle contraction.

Norepinephrine

A neurotransmitter produced mainly in the brainstem that stimulates alertness and arousal, closely linked to mood elevation.

Dopamine

A neurotransmitter involved in movement, motivation, and reward; excessive levels in certain brain areas relate to schizophrenia and deficits relate to Parkinson's disease.

Serotonin

A neurotransmitter that plays a crucial role in mood regulation, sleep, and appetite, whose deficit is associated with depression.

Glutamate

The primary excitatory neurotransmitter in the central nervous system, which acts on NMDA receptors crucial for learning and synaptic plasticity.

GABA (Gamma-Aminobutyric Acid)

The primary inhibitory neurotransmitter in the brain, whose enhancing effects produce tranquilizing and sedative outcomes.

Medulla

A narrow central core structure in the hindbrain that controls breathing and vital postural reflexes.

Pons

A hindbrain structure located above the medulla that controls attentiveness, timing of sleep, and acts as a bridge where nerve tracts cross over.

Reticular Formation

A network of neural circuits traversing the brainstem to the thalamus that regulates arousal, states of consciousness, and sensory filtering.

Cerebellum

A convoluted hindbrain structure attached to the rear of the brainstem that governs motor coordination, timing of movements, and motor learning.

Thalamus

Two egg-shaped groups of nerve cell nuclei in the forebrain that serve as a sensory relay station directing incoming information to the cerebral cortex.

Hypothalamus

A subcortical forebrain structure located below the thalamus that regulates basic drives such as eating, drinking, sexual behavior, and maintains body homeostasis.

Limbic System

A group of interconnected subcortical structures involved in emotion, memory, and modulating instinctive behaviors such as feeding, attacking, fleeing, and mating.

Amygdala

An almond-shaped subcortical structure within the limbic system that is critical in the formation of emotional memories and fear responses.

Hippocampus

A subcortical structure in the limbic system that plays a central role in consolidating new conscious information into permanent long-term memory.

Cerebral Cortex

The convoluted surface layer of the cerebral hemispheres consisting largely of nerve cell bodies (gray matter) that regulates higher intellectual processes.

Corpus Callosum

The thick band of nerve fibers connecting the two cerebral hemispheres, enabling communication and integration between them.

Broca's Area

A region in the left frontal lobe involved in speech production and articulatory motor codes.

Wernicke's Area

A region in the left temporal lobe involved in language comprehension and the storage of auditory word forms and meanings.

Aphasia

A term used to describe language deficits caused by localized brain damage.

Sympathetic Nervous System

The division of the autonomic nervous system that mobilizes the body during emergencies and intense arousal (the fight-or-flight response).

Parasympathetic Nervous System

The division of the autonomic nervous system that conserves energy and restores the body to a normal, calm, resting homeostatic state.

Endocrine System

A network of ductless glands that secretes hormones directly into the bloodstream to regulate distant cellular activities throughout the body.

Pituitary Gland

The 'master gland' of the endocrine system, located directly beneath the hypothalamus, which produces hormones that regulate growth and control other glands.

Natural Selection

The evolutionary process described by Charles Darwin whereby heritable trait variations that contribute most to survival and reproduction are passed to successive generations.

Monozygotic (Identical) Twins

Twins who develop from a single fertilized egg (zygote) that divides, sharing exactly 100 per cent of their genetic makeup.

Dizygotic (Fraternal) Twins

Twins who develop simultaneously from two separate fertilized eggs, sharing on average 50 per cent of their genetic material like ordinary siblings.

Maturation

An innately determined sequence of bodily growth and change that unfolds according to a biological timetable relatively independent of external events.

Critical Period

A crucial developmental window of time during which specific environmental or biological events must occur for development to proceed normally.

Sensitive Period

An optimal developmental period for acquiring a particular psychological capacity, during which lack of exposure restricts reaching full potential.

Schema (Piaget)

An organized mental theory or framework constructed by children through interactions with the environment to understand how the world operates.

Assimilation (Piaget)

The cognitive process of interpreting and understanding a novel object, situation, or event in terms of a pre-existing schema.

Accommodation (Piaget)

The cognitive process of modifying a pre-existing schema to fit new information that does not match current mental structures.

Sensorimotor Stage

Piaget's first stage of cognitive development (birth to age 2), during which infants discover relationships between their sensory impressions and motor actions.

Object Permanence

The cognitive realization that an object continues to exist in the external world even when it is out of sight.

Preoperational Stage

Piaget's second stage of cognitive development (ages 2 to 7), during which children use symbols and language but lack reversible mental operations.

Conservation

The cognitive understanding that the amount, mass, volume, or number of a substance remains the same despite transformations in its physical appearance.

Egocentrism

A characteristic of preoperational thought in which children are unaware of perspectives other than their own and assume everyone perceives things as they do.

Concrete Operational Stage

Piaget's third stage of cognitive development (ages 7 to 11), during which children master conservation and perform logical mental operations on tangible objects.

Formal Operational Stage

Piaget's fourth stage of cognitive development (beginning around age 11 or 12), marked by the ability to think logically about abstract propositions and test hypotheses systematically.

Private Speech

In Vygotsky's theory, the self-directed audible speech used by children to give themselves guidance, instructions, and direction during problem-solving.

Metacognition

The cognitive process of reflecting on and monitoring one's own internal thinking processes and knowledge states.