What Are AP Psychology Terms and Definitions?
AP Psychology terms refer to the core concepts, processes, and theories that structure the entire course. These ideas are embedded within each unit’s essential knowledge, from neural communication and memory systems to social influence and psychological disorders. The College Board expects students to do more than recognize these terms. On the exam, they appear in multiple-choice scenarios and free-response prompts that require accurate explanation and application.
A strong definition helps you understand what a concept includes, how it functions, and how it connects to related ideas. Rather than isolated vocabulary, these terms form the conceptual framework of AP Psychology. When you understand them clearly, you are better equipped to interpret questions and construct precise answers.
Why Learning AP Psychology Vocabulary Is Critical for Exam Success?
Knowing the definition of a term is only the starting point. What determines your score on the AP Psychology exam is whether you can recognize that term in context and apply it correctly under pressure. Vocabulary knowledge directly affects how confidently and accurately you move through both sections of the test.
A strong grasp of key terms helps you:
- Identify the concept being tested in scenario-based multiple-choice questions
- Distinguish between closely related ideas that often appear together
- Use precise terminology in free-response answers
- Avoid losing points due to vague or partially correct explanations
On the multiple-choice section, many questions describe research findings, behaviors, or real-life situations without explicitly naming the concept. You have to recognize the term based on understanding, not memorization. On the free-response section, scoring depends on whether you apply the correct term accurately and explain it clearly within the context provided.
AP Psychology Vocabulary List by Unit
The AP Psychology exam is organized into 5 units, each built around a set of core concepts defined in the current College Board framework. To make studying more manageable, the vocabulary below is grouped by unit so you can focus on the terms that correspond to what you are learning in class. While this is not an exhaustive dictionary of every possible term, it covers the foundational vocabulary you are expected to understand, define, and apply on the exam.
If you are reviewing a specific unit, pairing these key terms with a structured AP Psychology study guide can help you see how concepts connect across topics and prepare more strategically for unit tests and the final exam.
Unit 1: Biological Bases of Behavior
Unit 1 examines how biological systems shape behavior and mental processes. You will explore neural communication, brain structure and function, genetics, sleep, and sensation. This scientific foundation supports everything else you study in AP Psychology and represents 15-25% of the exam.
| Term | Definition |
|---|---|
| Heredity | The genetic transmission of traits from parents to offspring that influence physical characteristics, behavior patterns, and psychological processes across generations. |
| Behavior Genetics | The scientific study of how genetic factors and environmental influences interact to shape individual differences in behavior and mental processes. |
| Neuron | A specialized nerve cell that transmits information throughout the body using electrical impulses and chemical signals within the nervous system. |
| Action Potential | A brief electrical impulse that travels down a neuron’s axon, enabling communication between neurons within complex neural networks. |
| Synapse | The junction between two neurons where neurotransmitters are released to transmit signals across a small synaptic gap. |
| Neurotransmitter | A chemical messenger that carries signals across a synapse from one neuron to another, influencing neural communication and behavior. |
| Agonist | A substance that increases or mimics the effects of a neurotransmitter by binding to specific receptor sites in the brain. |
| Antagonist | A substance that blocks or reduces the effects of a neurotransmitter by preventing it from binding to receptor sites. |
| Central Nervous System (CNS) | The brain and spinal cord, responsible for processing sensory information and coordinating behavior throughout the entire body. |
| Peripheral Nervous System (PNS) | The network of nerves outside the brain and spinal cord that connects the central nervous system to the rest of the body. |
| Sympathetic Nervous System | The division of the autonomic nervous system that activates the body’s fight or flight response during stressful situations. |
| Parasympathetic Nervous System | The division of the autonomic nervous system that restores the body to a calm and balanced state after stress. |
| Cerebral Cortex | The outer layer of the brain responsible for higher-level thinking, perception, language processing, and voluntary movement. |
| Limbic System | A group of interconnected brain structures involved in emotion, motivation, memory formation, and emotional responses. |
| Hypothalamus | A small brain structure that maintains homeostasis and links the nervous system to the endocrine system. |
| Endocrine System | A network of glands that secrete hormones into the bloodstream to regulate growth, metabolism, and other long-term bodily processes. |
| Hormone | A chemical messenger released by endocrine glands that travels through the bloodstream to regulate target organs and bodily functions. |
| Circadian Rhythm | The body’s internal biological clock that regulates sleep-wake cycles and other daily physiological rhythms. |
| REM Sleep | A stage of sleep characterized by rapid eye movement, vivid dreaming, and increased brain activity. |
| Absolute Threshold | The minimum level of stimulus intensity required to detect a stimulus fifty percent of the time. |
Unit 2: Cognition
Unit 2 focuses on how we process, store, retrieve, and interpret information. You will study perception, memory systems, thinking processes, and intelligence. This unit represents 15-25% of the AP exam and plays a major role in both multiple-choice and free-response questions.
| Term | Definition |
|---|---|
| Perception | The process of organizing and interpreting sensory information to recognize meaningful objects and events in the environment. |
| Signal Detection Theory | A theory explaining how individuals determine whether a stimulus is present amid background noise based on sensitivity and decision criteria. |
| Selective Attention | The process of focusing conscious awareness on a specific stimulus while ignoring competing sensory information. |
| Encoding | The process of converting sensory input into a form that can be stored in memory. |
| Storage | The retention of encoded information over time within the memory system. |
| Retrieval | The process of accessing stored information from memory for use in thinking or behavior. |
| Working Memory | A limited capacity system that temporarily holds and manipulates information for tasks such as reasoning and comprehension. |
| Long Term Memory | The relatively permanent and limitless storehouse of information including knowledge, skills, and experiences. |
| Explicit Memory | Memory of facts and experiences that can be consciously recalled and described verbally. |
| Implicit Memory | Memory that influences behavior without conscious awareness, including skills and conditioned associations. |
| Schema | A mental framework that organizes and interprets information based on prior knowledge and experience. |
| Assimilation | The process of incorporating new information into existing cognitive schemas without changing those schemas. |
| Accommodation | The process of adjusting existing schemas to incorporate new information that does not fit the previous understanding. |
| Algorithm | A methodical step-by-step procedure that guarantees a solution to a problem. |
| Heuristic | A mental shortcut that simplifies problem-solving but may increase the likelihood of errors. |
| Confirmation Bias | The tendency to search for, interpret, and remember information that supports preexisting beliefs. |
| Hindsight Bias | The tendency to believe after learning an outcome that one would have predicted it beforehand. |
| Divergent Thinking | A creative thinking process that generates multiple possible solutions to a problem. |
| Intelligence | The ability to learn from experience, solve problems, and adapt effectively to new situations. |
| Standardization | The process of establishing uniform procedures for administering and scoring a psychological test. |
Unit 3: Development and Learning
Unit 3 examines how people grow and change across the lifespan and how learning shapes behavior. You will study physical, cognitive, and social development as well as the principles of conditioning and observational learning. This unit accounts for 15-25% of the AP exam.
| Term | Definition |
|---|---|
| Longitudinal Study | A research method that follows the same group of participants over an extended period to observe developmental changes. |
| Cross Sectional Study | A research method that compares participants of different ages at one point in time to examine developmental differences. |
| Maturation | The biological growth processes that enable orderly changes in behavior are relatively uninfluenced by experience. |
| Attachment | An emotional bond between individuals, typically between an infant and caregiver, that influences later relationships. |
| Temperament | A person’s characteristic emotional reactivity and intensity are observable from early childhood. |
| Authoritative Parenting | A parenting style characterized by high responsiveness and high expectations that promotes independence and self-regulation. |
| Gender Identity | A person’s internal sense of being male, female, or another gender, regardless of biological sex. |
| Sexual Orientation | An enduring pattern of emotional, romantic, or sexual attraction toward others. |
| Classical Conditioning | A learning process in which a neutral stimulus becomes associated with a meaningful stimulus and acquires the ability to trigger a response. |
| Unconditioned Stimulus | A stimulus that naturally and automatically triggers a response without prior learning. |
| Conditioned Stimulus | A previously neutral stimulus that, after association with an unconditioned stimulus, triggers a conditioned response. |
| Operant Conditioning | A learning process in which behavior is strengthened or weakened by consequences such as reinforcement or punishment. |
| Reinforcement | Any consequence that strengthens or increases the likelihood of a behavior occurring again. |
| Positive Reinforcement | The addition of a desirable stimulus after a behavior increases the likelihood that the behavior will recur. |
| Negative Reinforcement | The removal of an aversive stimulus following a behavior increases the likelihood that the behavior will recur. |
| Punishment | Any consequence that decreases the likelihood of a behavior occurring again. |
| Observational Learning | Learning that occurs through observing and imitating others' behavior. |
| Modeling | The process of imitating a specific behavior demonstrated by another individual. |
| Cognitive Development | The growth of thinking, reasoning, and problem-solving abilities across the lifespan. |
| Social Development | The development of interpersonal skills, relationships, and social understanding throughout the lifespan. |
Unit 4: Social Psychology and Personality
Unit 4 explores how individuals think about, influence, and relate to others, as well as how personality develops and is studied. You will examine attribution, attitudes, group behavior, major personality theories, motivation, and emotion. This unit accounts for 15-25% of the AP exam.
| Term | Definition |
|---|---|
| Attribution Theory | A theory explaining how individuals interpret and explain the causes of their own and others’ behaviors. |
| Fundamental Attribution Error | The tendency to overestimate dispositional factors and underestimate situational influences when explaining others’ behavior. |
| Self-Serving Bias | The tendency to attribute personal successes to internal factors and failures to external circumstances. |
| Attitude | A learned predisposition to respond favorably or unfavorably toward a particular object, person, or idea. |
| Cognitive Dissonance | Psychological discomfort experienced when holding two conflicting beliefs or when behavior conflicts with attitudes. |
| Persuasion | The process of influencing attitudes or behaviors through communication and argument. |
| Conformity | Adjusting behavior or thinking to align with group norms or expectations. |
| Obedience | Compliance with orders or commands from an authority figure. |
| Social Facilitation | Improved performance on simple tasks when in the presence of others. |
| Social Loafing | The tendency for individuals to exert less effort when working in a group than alone. |
| Groupthink | The desire for harmony within a group results in poor decision-making and suppression of dissent. |
| Prejudice | An unjustifiable negative attitude toward a group and its members. |
| Discrimination | Unjustified negative behavior toward members of a particular group. |
| Trait Theory | A personality theory focusing on identifying and measuring stable personality characteristics. |
| Psychodynamic Theory | A personality theory emphasizing unconscious motives and childhood experiences in shaping behavior. |
| Humanistic Theory | A personality theory emphasizing personal growth, self-actualization, and free will. |
| Social Cognitive Theory | A personality theory emphasizing reciprocal interactions among behavior, personal factors, and environment. |
| Intrinsic Motivation | Engaging in behavior for internal satisfaction rather than external rewards. |
| Extrinsic Motivation | Engaging in behavior to obtain external rewards or avoid punishment. |
| Emotion | A complex psychological state involving physiological arousal, expressive behavior, and conscious experience. |
Unit 5: Mental and Physical Health
Unit 5 examines how psychologists understand, diagnose, and treat mental disorders while also promoting physical and psychological well-being. You will study major categories of disorders, diagnostic standards, and both historical and modern treatment approaches. This unit represents 15-25% of the AP exam.
| Term | Definition |
|---|---|
| Psychological Disorder | A pattern of thoughts, feelings, or behaviors that causes significant distress or impairment in functioning. |
| DSM 5 TR | The Diagnostic and Statistical Manual of Mental Disorders used by clinicians to classify and diagnose psychological disorders. |
| Neurodevelopmental Disorder | A disorder with onset in childhood, characterized by developmental deficits that impair personal, social, or academic functioning. |
| Schizophrenia | A severe psychological disorder characterized by disorganized thinking, disturbed perceptions, and inappropriate emotions or actions. |
| Delusion | A false belief firmly held despite contradictory evidence and not explained by cultural norms. |
| Hallucination | A sensory experience without external stimulation, such as hearing voices that are not present. |
| Bipolar Disorder | A mood disorder characterized by alternating periods of mania and depression that impair functioning. |
| Major Depressive Disorder | A mood disorder involving persistent feelings of sadness, loss of interest, and impaired daily functioning. |
| Anxiety Disorder | A group of disorders characterized by excessive fear, worry, and related behavioral disturbances. |
| Obsessive Compulsive Disorder | A disorder involving intrusive thoughts and repetitive behaviors performed to reduce anxiety. |
| Posttraumatic Stress Disorder | A disorder that develops after exposure to a traumatic event and involves persistent distressing memories or reactions. |
| Dissociative Disorder | A disorder involving disruptions in memory, identity, or consciousness. |
| Eating Disorder | A disorder characterized by abnormal eating behaviors that negatively affect physical or mental health. |
| Personality Disorder | A disorder involving enduring maladaptive patterns of behavior, cognition, and inner experience. |
| Biomedical Therapy | Treatment for psychological disorders involving medication or medical procedures that alter brain functioning. |
| Psychotherapy | Treatment involving psychological techniques used to improve mental health and coping skills. |
| Cognitive Behavioral Therapy | A psychotherapy approach that changes maladaptive thinking patterns to influence behavior and emotional regulation. |
| Humanistic Therapy | A therapeutic approach emphasizing personal growth, self-awareness, and acceptance. |
| Positive Psychology | The scientific study of strengths, well-being, and factors that enable individuals and communities to thrive. |
| Stress | The physiological and psychological response to perceived challenges or threats. |
Most Important AP Psychology Terms and Definitions to Memorize
While every unit includes essential vocabulary, certain concepts recur across multiple-choice questions and free-response prompts. These terms are foundational, frequently tested, and often embedded in real-world scenarios. If you are prioritizing your review, focus on mastering these first.
| Neuron | Operant Conditioning | Heuristic | Intelligence |
| Neurotransmitter | Positive Reinforcement | Confirmation Bias | Schizophrenia |
| Sympathetic Nervous System | Schema | Fundamental Attribution Error | Major Depressive Disorder |
| Heredity | Working Memory | Confirmity | Cognitive Behavioral Therapy |
| Classical Conditioning | Long-Term Memory | Cognitive Dissonance | Stress |
These terms show up frequently because they anchor larger concepts within each unit. Besides, it is equally important to distinguish commonly confused pairs such as positive versus negative reinforcement, assimilation versus accommodation, and heuristic versus algorithm. Many lost points on the AP exam come from mixing up similar concepts rather than misunderstanding them entirely.
If you know these 20 terms deeply and can apply them in context, you will be prepared for a substantial portion of the exam. For additional support, an AP Psychology prep course can provide structured practice, flashcards, and targeted question sets to reinforce these concepts and improve application skills.
How to Study AP Psychology Terms Effectively
Memorizing definitions once and hoping they stick is not an effective strategy for AP Psychology. The exam tests whether you can recognize and apply terms in context, often within complex scenarios. To truly master vocabulary, you need study methods that build recall, precision, and application.
Here are research-backed strategies that work:
- Use active recall instead of rereading: Cover the definition and try to explain the term out loud or in writing before checking yourself.
- Apply spaced repetition: Review terms over several weeks instead of cramming them the night before a test.
- Practice with real scenarios: Take a term and create your own example or apply it to a practice multiple-choice or free-response question.
- Distinguish similar concepts deliberately: Study commonly confused pairs side by side to clearly explain the differences.
- Simulate exam timing: Test yourself under time pressure to strengthen retrieval speed and confidence.
Vocabulary mastery in AP Psychology is not about memorizing isolated definitions. It is about recognizing a concept in context, selecting the correct term quickly, and explaining it accurately. The more you practice applying terms rather than just reviewing them, the stronger your performance will be on exam day.
If you’re ready to move beyond memorization, structured practice makes the difference. Use AP Psychology flashcards to strengthen recall, work through unit-based QBanks to apply terms in context, and review detailed study guides to connect concepts across units.
