Biological Bases, Sensation, and Perception
The neural and sensory foundations of behavior form the biological basis of psychology. These cards cover the nervous system, brain structures, and the principles that translate physical stimuli into conscious experience.
The Nervous System and Brain Structure
Understanding neurons and neural pathways helps explain how the brain processes information. The neuron is the basic cell of the nervous system, with dendrites that receive signals, a cell body that integrates them, and an axon that conducts electrical impulses. Neurotransmitters released at synapses allow neurons to communicate with each other.
Neurotransmitters regulate different functions. Dopamine controls reward and movement. Serotonin influences mood and sleep. GABA provides inhibition and anxiety regulation. Glutamate enables excitation and memory. Acetylcholine supports memory and muscle movement. Endorphins provide pain relief and euphoria.
The central nervous system (brain and spinal cord) works together with the peripheral nervous system (all nerves outside the CNS). The PNS divides into somatic nerves (voluntary control) and autonomic nerves (involuntary control). The autonomic system further splits into sympathetic (fight-or-flight) and parasympathetic (rest-and-digest) branches.
Key Brain Structures and Their Functions
The medulla controls breathing and heart rate. The pons manages sleep and arousal. The cerebellum coordinates balance, coordination, and procedural memory. The thalamus relays sensory information. The hypothalamus regulates hunger, thirst, temperature, and hormones. The amygdala processes fear and emotion. The hippocampus forms new memories.
The cerebral cortex is divided into four lobes with specific functions. The frontal lobe handles executive function, motor control, and Broca's language area. The parietal lobe processes sensory information and spatial awareness. The temporal lobe contains the auditory cortex, Wernicke's language area, and memory regions. The occipital lobe contains the visual cortex.
Phineas Gage was an 1848 railway worker whose iron rod passed through his frontal lobe. His dramatic personality changes (increased impulsivity and reduced self-control) provided early evidence that the frontal lobe mediates personality and decision-making.
Neural Plasticity and Sensory Processing
Plasticity is the brain's ability to reorganize itself by forming new neural connections. This ability is strongest in childhood but continues throughout life. Neurogenesis (new neuron formation) occurs in the hippocampus even in adulthood. Recovery from stroke often demonstrates the brain's remarkable ability to rewire itself.
The absolute threshold is the minimum stimulus intensity detected 50 percent of the time. The difference threshold (just noticeable difference) is the minimum change detectable 50 percent of the time. Weber's law states that the difference threshold is a constant proportion of the original stimulus.
Signal detection theory explains that detection depends on both the stimulus and the observer's motivation, fatigue, and expectations. This explains why radiologists may miss tumors or why soldiers may fire at shadows in low visibility.
Vision and Hearing
Rods and cones are the two types of light-sensitive cells in the eye. Rods (about 120 million) work in dim light but do not detect color. Cones (about 6 million) concentrate in the fovea, require bright light, and enable color vision. The blind spot is where the optic nerve exits the retina and contains no light-sensing cells.
Trichromatic theory proposes three cone types (red, green, blue) that combine to create all colors. Opponent-process theory suggests cells fire one way for red versus green (and blue versus yellow). Both theories operate: trichromatic processing happens at the retina, and opponent-process happens downstream in the visual system.
For hearing, place theory states that pitch is determined by which part of the basilar membrane vibrates most (explains high pitches). Frequency theory states that pitch is determined by the rate of neural firing (explains low pitches). The volley principle extends frequency theory by showing that combined neural firing can code even higher frequencies.
Perception and Organization
Gestalt principles explain how perception organizes information into meaningful patterns. The whole is greater than the sum of its parts. Figure-ground, proximity, similarity, continuity, closure, and connectedness are all ways the brain groups visual information. Gestalt psychologists like Wertheimer, Köhler, and Koffka showed that perception is organized, not built piece by piece.
Depth cues allow the brain to perceive three-dimensional space. Binocular cues include retinal disparity (the difference between the two eyes' images) and convergence (the inward turning of eyes for nearby objects). Monocular cues work with just one eye: relative size, interposition, linear perspective, texture gradient, and relative motion.
Perceptual constancy allows objects to appear unchanged despite changes in sensory input. Size, shape, color, and brightness constancy mean a door appears rectangular even when its retinal image becomes trapezoidal as it swings open.
| Term | Meaning |
|---|---|
| Neuron | The basic cell of the nervous system. Dendrites receive signals, the cell body integrates them, the axon conducts the action potential, and axon terminals release neurotransmitters into the synaptic cleft to communicate with the next neuron. |
| Action Potential | The electrical impulse traveling down an axon, generated when the neuron reaches its threshold. Follows the all-or-none principle: either fires completely or not at all. Speed increases with myelination. |
| Neurotransmitters and Functions | Dopamine (reward, movement; low in Parkinson's, dysregulated in schizophrenia). Serotonin (mood, sleep; low in depression). GABA (primary inhibitory; low levels linked to anxiety). Glutamate (excitatory, memory). Acetylcholine (memory, muscle movement; low in Alzheimer's). Endorphins (pain relief, euphoria). |
| Central vs. Peripheral Nervous System | CNS: brain and spinal cord. PNS: all nerves outside CNS. PNS divides into somatic (voluntary) and autonomic (involuntary), which further divides into sympathetic ('fight-or-flight') and parasympathetic ('rest-and-digest') branches. |
| Brain Structures | Medulla (breathing, heart rate), pons (sleep, arousal), cerebellum (balance, coordination, procedural memory), thalamus (sensory relay), hypothalamus (hunger, thirst, temperature, hormones), amygdala (fear, emotion), hippocampus (memory formation). |
| Cerebral Cortex Lobes | Frontal (executive function, motor cortex, Broca's area), parietal (somatosensory cortex, spatial processing), temporal (auditory cortex, Wernicke's area, memory), occipital (visual cortex). Left hemisphere: language and logic in most right-handers; right: spatial and emotional processing. |
| Phineas Gage | 1848 railway foreman who survived an iron rod passing through his frontal lobe. Dramatic personality changes (impulsivity, loss of inhibition) provided early evidence that the frontal lobe mediates personality, decision-making, and emotional regulation. |
| Plasticity | The brain's ability to reorganize itself by forming new neural connections. Particularly strong in childhood but continues throughout life (e.g., stroke recovery, learning new skills). Neurogenesis, new neuron formation, occurs in the hippocampus. |
| Absolute Threshold vs. Difference Threshold | Absolute threshold: minimum stimulus intensity detected 50% of the time. Difference threshold (just noticeable difference, JND): minimum change detectable 50% of the time. Weber's law: the JND is a constant proportion of the original stimulus. |
| Signal Detection Theory | Detection depends on both the stimulus and the observer's response bias (motivation, fatigue, expectation). Outcomes: hit, miss, false alarm, correct rejection. Explains why radiologists may miss tumors or why soldiers may fire at shadows. |
| Rods vs. Cones | Rods (~120 million): peripheral, operate in dim light, no color. Cones (~6 million): concentrated in the fovea, require bright light, enable color vision. Blind spot: where the optic nerve exits the retina, no photoreceptors. |
| Trichromatic Theory vs. Opponent-Process Theory | Trichromatic (Young-Helmholtz): three cone types (red, green, blue) combine to produce all colors. Opponent-process (Hering): cells fire one way for red and the opposite for green (similarly blue/yellow, black/white). Both operate; trichromatic at the retina, opponent-process downstream. |
| Place Theory vs. Frequency Theory | Place theory: pitch is determined by which part of the basilar membrane vibrates most (works for high pitches). Frequency theory: pitch is determined by the rate of neural firing (works for low pitches). Volley principle extends frequency theory via combined neural firing. |
| Gestalt Principles | The whole is greater than the sum of its parts. Figure-ground, proximity, similarity, continuity, closure, and connectedness. Developed by Wertheimer, Köhler, and Koffka; showed that perception is organized, not built piece by piece. |
| Depth Cues | Binocular: retinal disparity (difference between the two eyes' images) and convergence (inward turning of eyes for nearby objects). Monocular: relative size, interposition, linear perspective, texture gradient, relative motion. |
| Perceptual Constancy | Perceiving objects as unchanged despite changes in sensory input. Size, shape, color, and brightness constancy allow a door to appear rectangular even when its retinal image becomes trapezoidal as it swings open. |
Learning, Cognition, and Memory
Classical and operant conditioning, memory systems, thinking, and language form the foundation of learning psychology. These cards center on the pioneering psychologists and experiments that established the field.
Classical and Operant Conditioning
Ivan Pavlov was a Russian physiologist whose work with dogs demonstrated classical conditioning. A neutral stimulus (bell) paired with an unconditioned stimulus (food) eventually elicits a conditioned response (salivation). Key terms include unconditioned stimulus (UCS), unconditioned response (UCR), conditioned stimulus (CS), conditioned response (CR), acquisition, extinction, spontaneous recovery, generalization, and discrimination.
John B. Watson, founder of behaviorism, conditioned a 9-month-old infant called Little Albert to fear a white rat by pairing it with a loud noise. The fear generalized to other furry objects. This study showed that emotional responses can be classically conditioned and raised ethical concerns still discussed today.
B.F. Skinner demonstrated that behavior is shaped by its consequences through operant conditioning. Positive reinforcement adds a pleasant stimulus to increase behavior. Negative reinforcement removes an unpleasant stimulus to increase behavior. Positive punishment adds an unpleasant stimulus to decrease behavior. Negative punishment removes a pleasant stimulus to decrease behavior. Skinner's experiments with rats and pigeons in operant conditioning boxes demonstrated these principles clearly.
Schedules of reinforcement determine how often behavior is rewarded. Continuous reinforcement (rewarding every response) produces fast learning but fast extinction. Partial reinforcement is more resistant to extinction. Fixed-ratio schedules reward a set number of responses. Variable-ratio schedules are the most resistant to extinction (like gambling). Fixed-interval and variable-interval schedules vary the timing of rewards. Variable schedules produce steady, persistent responding.
Observational Learning and Memory
Albert Bandura demonstrated observational learning with the Bobo doll experiment (1961). Children who observed adults acting aggressively toward a doll later imitated that aggression. This showed that learning can occur without direct reinforcement, through modeling and observing vicarious consequences. Bandura introduced social learning theory and self-efficacy concepts.
Hermann Ebbinghaus (1885) memorized nonsense syllables and plotted his retention over time. Forgetting is rapid at first, then levels off (the forgetting curve). This foundational work proved that spaced repetition reduces the slope of forgetting and improves long-term retention.
Memory Systems
The Atkinson-Shiffrin model describes three memory stages. Sensory memory is brief and modality-specific (iconic for vision, echoic for sound). Short-term/working memory holds about seven items for 20-30 seconds without rehearsal. Long-term memory has unlimited capacity and can be potentially permanent.
Working memory (Baddeley) is the active component of short-term memory. The central executive directs the phonological loop (verbal rehearsal) and the visuospatial sketchpad (visual and spatial information). The episodic buffer integrates information with long-term memory.
Explicit memory (declarative) includes episodic memory (personal events) and semantic memory (facts and general knowledge). Implicit memory (non-declarative) includes procedural memory (skills and habits), classically conditioned responses, and priming. Explicit memory depends on the hippocampus. Implicit memory depends on the cerebellum and basal ganglia.
Elizabeth Loftus demonstrated the reconstructive nature of memory through her work on the misinformation effect. Post-event information like leading questions can alter eyewitness recollections. Her "Lost in the Mall" study showed that false childhood memories can be implanted. This has major implications for legal testimony and the reliability of memory.
Retrieval and Thinking
The serial position effect shows that first items (primacy effect) and last items (recency effect) in a list are best recalled. Middle items are worst recalled. This demonstrates the distinction between short-term and long-term memory.
Proactive interference occurs when old information disrupts recall of new (calling a new partner by an ex's name). Retroactive interference occurs when new information disrupts recall of old (learning Spanish makes French harder to recall).
Wolfgang Köhler studied chimpanzees solving problems through sudden insight rather than trial and error. They stacked boxes to reach bananas. This challenged strict behaviorism by demonstrating cognitive processes in animal learning.
Kahneman and Tversky identified heuristics that shape thinking. The availability heuristic judges probability by how easily examples come to mind (fearing shark attacks after news coverage). The representativeness heuristic judges by similarity to a prototype while ignoring base rates.
Confirmation bias means seeking and remembering information that confirms existing beliefs. Cognitive dissonance (Festinger) is psychological discomfort when behavior and attitudes conflict. This discomfort motivates attitude change to reduce tension.
Language and Linguistic Relativity
Benjamin Whorf proposed the hypothesis of linguistic relativity: the language you speak shapes how you think. The strong version (language determines thought) is disputed. The weak version (language influences thought) has modest empirical support, particularly in color perception and spatial reasoning.
| Term | Meaning |
|---|---|
| Ivan Pavlov, Classical Conditioning | Russian physiologist whose work with dogs demonstrated that a neutral stimulus (bell) paired with an unconditioned stimulus (food) eventually elicits a conditioned response (salivation). Core terms: UCS, UCR, CS, CR, acquisition, extinction, spontaneous recovery, generalization, discrimination. |
| John B. Watson, Little Albert | Founder of behaviorism. Conditioned 9-month-old Little Albert to fear a white rat by pairing it with a loud noise; the fear generalized to other furry objects. Showed that emotional responses can be classically conditioned, raised ethical concerns still discussed today. |
| B.F. Skinner, Operant Conditioning | Behavior is shaped by its consequences. Positive reinforcement adds a pleasant stimulus; negative reinforcement removes an unpleasant one (both increase behavior). Positive punishment adds unpleasant; negative punishment removes pleasant (both decrease behavior). Skinner box demonstrated these with rats and pigeons. |
| Schedules of Reinforcement | Continuous: every response reinforced; fastest acquisition but fastest extinction. Partial: resistant to extinction. Fixed-ratio, variable-ratio (most resistant to extinction, e.g., gambling), fixed-interval, variable-interval. Variable schedules produce steady, persistent responding. |
| Albert Bandura, Observational Learning | Demonstrated with the Bobo doll experiment (1961) that children learn aggression by observing adult models. Introduced social learning theory and self-efficacy. Learning can occur without direct reinforcement, via modeling and vicarious consequences. |
| Ebbinghaus Forgetting Curve | Hermann Ebbinghaus (1885) memorized nonsense syllables and plotted retention over time. Forgetting is rapid at first, then levels off. Foundational evidence for spaced repetition: relearning at spaced intervals reduces the slope of forgetting. |
| Atkinson-Shiffrin Model | Three-stage model of memory: sensory memory (brief, modality-specific: iconic visual, echoic auditory), short-term/working memory (~7±2 items, ~20-30 seconds without rehearsal), and long-term memory (unlimited capacity, potentially permanent). |
| Working Memory (Baddeley) | Active component of short-term memory. Central executive directs two subsystems: the phonological loop (verbal rehearsal) and the visuospatial sketchpad (visual/spatial information). Episodic buffer integrates information with long-term memory. |
| Types of Long-Term Memory | Explicit (declarative): episodic (personal events) and semantic (facts, general knowledge). Implicit (non-declarative): procedural (skills, habits), classically conditioned responses, and priming. Explicit depends on hippocampus; implicit on cerebellum and basal ganglia. |
| Elizabeth Loftus, Misinformation Effect | Her work demonstrated the reconstructive nature of memory. Post-event information (such as leading questions) can alter eyewitness recollections. 'Lost in the Mall' study showed that false childhood memories can be implanted. Major implications for legal testimony. |
| Serial Position Effect | In a list, the first items (primacy effect, transferred to long-term memory) and last items (recency effect, still in short-term memory) are best recalled; middle items are worst. Demonstrates the distinction between STM and LTM. |
| Types of Interference | Proactive interference: old information disrupts recall of new (calling a new partner by an ex's name). Retroactive interference: new information disrupts recall of old (learning Spanish makes French harder to recall). |
| Wolfgang Köhler, Insight Learning | Studied chimpanzees solving problems (stacking boxes to reach bananas) through sudden insight rather than trial and error. Challenged strict behaviorism by demonstrating cognitive processes in animal learning. |
| Availability vs. Representativeness Heuristics | Kahneman and Tversky. Availability: judging probability by how easily examples come to mind (fearing shark attacks after seeing news coverage). Representativeness: judging by similarity to a prototype (ignoring base rates). |
| Confirmation Bias and Cognitive Dissonance | Confirmation bias: seeking and remembering information that confirms existing beliefs. Cognitive dissonance (Festinger): psychological discomfort when behavior and attitudes conflict, motivating attitude change to reduce tension. |
| Benjamin Whorf, Linguistic Relativity | The hypothesis that the language you speak shapes how you think. Strong version (language determines thought) is disputed; weak version (language influences thought) has modest empirical support, particularly in color perception and spatial reasoning. |
Development, Personality, and Social Psychology
How humans change over the lifespan, how personality is theorized and measured, and how social contexts shape behavior are central to understanding psychology.
Cognitive and Moral Development
Jean Piaget proposed four stages of cognitive development. The sensorimotor stage (ages 0-2) involves learning object permanence. The preoperational stage (ages 2-7) is marked by egocentrism and lack of conservation. The concrete operational stage (ages 7-11) brings conservation and logical thinking about concrete events. The formal operational stage (ages 12 and up) enables abstract and hypothetical reasoning.
Erik Erikson described eight stages of psychosocial development across the lifespan. Each stage presents a psychosocial crisis. Trust versus mistrust occurs in infancy. Autonomy versus shame and doubt occurs in early childhood. Initiative versus guilt occurs in preschool. Industry versus inferiority occurs in school age. Identity versus role confusion occurs in adolescence. Intimacy versus isolation occurs in young adulthood. Generativity versus stagnation occurs in middle adulthood. Integrity versus despair occurs in old age.
Lawrence Kohlberg proposed three levels of moral development with six stages. The preconventional level involves obedience to avoid punishment and then acting for self-interest. The conventional level involves gaining interpersonal accord and then following law-and-order principles. The postconventional level involves understanding social contracts and applying universal ethical principles. Carol Gilligan critiqued Kohlberg for ignoring female moral reasoning that emphasizes care and relationships.
Social Development and Attachment
Lev Vygotsky emphasized sociocultural theory, showing that development occurs through social interaction. The zone of proximal development is the gap between what a child can do alone and what they can do with guidance. Scaffolding is temporary support from more knowledgeable others that is gradually removed.
Mary Ainsworth used the Strange Situation experiment to identify attachment styles. Secure attachment means the infant uses the mother as a base, shows distress at separation, and is comforted at reunion. Insecure-avoidant attachment involves little distress or comfort-seeking. Insecure-resistant/ambivalent attachment involves inconsistent responses. Disorganized attachment appears later and involves confused behaviors. These patterns predict later relationships.
Harry Harlow conducted rhesus monkey experiments showing that infants preferred a cloth mother providing contact comfort to a wire mother providing food. This challenged the behaviorist view that attachment was purely about reinforcement through feeding.
Personality Theories
Sigmund Freud proposed that personality has three structures: the id (pleasure principle), the ego (reality principle), and the superego (morality). He described five psychosexual stages: oral, anal, phallic, latency, and genital. Defense mechanisms like repression, denial, projection, rationalization, and sublimation protect against anxiety. Freud's theory is largely unsupported empirically but historically dominant in psychology.
Carl Rogers emphasized free will and self-actualization in humanistic psychology. Unconditional positive regard from others supports congruence between real and ideal self. Client-centered therapy focuses on empathy, genuineness, and acceptance. Rogers influenced modern counseling practices significantly.
Abraham Maslow proposed a five-level hierarchy of needs. Physiological needs are at the base, followed by safety, love and belonging, esteem, and self-actualization. Lower needs must be substantially met before higher ones become primary motivators. Maslow later added self-transcendence. This theory is influential despite limited empirical testing.
The Big Five (OCEAN) model is the dominant trait framework. Openness involves imagination and curiosity. Conscientiousness involves organization and discipline. Extraversion involves sociability. Agreeableness involves compassion and cooperation. Neuroticism involves emotional instability. This model is stable across cultures and predictive of life outcomes.
Social Influence
Solomon Asch conducted line-judging experiments in the 1950s. Approximately 37 percent of responses conformed to an obviously wrong group consensus. Conformity increased with group size (up to about 5), unanimity, and public responding. This demonstrated normative social influence.
Stanley Milgram studied obedience by having participants administer what they believed were dangerous shocks to a confederate when ordered by an authority figure. Sixty-five percent went to the maximum 450 volts. This highlighted the power of situational factors and legitimate authority. His work prompted major revisions in research ethics.
Philip Zimbardo conducted the Stanford Prison Experiment in 1971. College students assigned to guard and prisoner roles showed rapid escalation of abusive behavior. The study was terminated after six days due to severe psychological effects. While it illustrated the power of roles, later replications and methodological critiques have tempered interpretations.
Attribution and Attitudes
The fundamental attribution error is the tendency to attribute others' behavior to disposition (personality) while attributing our own behavior to situation. A driver who cuts you off is "a jerk." When you cut someone off, you were "late for a meeting." This bias is more common in individualistic cultures.
Cognitive dissonance (Festinger) creates discomfort from inconsistent attitudes and behaviors. A classic 1959 study showed that participants paid only one dollar (not twenty dollars) to lie about a boring task later rated the task as more interesting. They shifted attitudes to reduce dissonance.
The bystander effect or diffusion of responsibility means the presence of others reduces the likelihood of any one person helping. Darley and Latané identified five stages of helping following the Kitty Genovese case. Pluralistic ignorance and diffusion of responsibility are key mechanisms.
| Term | Meaning |
|---|---|
| Jean Piaget, Cognitive Development | Four stages: sensorimotor (0-2, object permanence), preoperational (2-7, egocentrism, lack of conservation), concrete operational (7-11, conservation and logical thinking about concrete events), formal operational (12+, abstract and hypothetical reasoning). |
| Erik Erikson, Psychosocial Development | Eight stages across the lifespan, each a psychosocial crisis. Trust vs. mistrust (infancy), autonomy vs. shame, initiative vs. guilt, industry vs. inferiority, identity vs. role confusion (adolescence), intimacy vs. isolation, generativity vs. stagnation, integrity vs. despair. |
| Lawrence Kohlberg, Moral Development | Three levels, six stages. Preconventional (obey to avoid punishment, then for self-interest), conventional (interpersonal accord, then law-and-order), postconventional (social contract, then universal ethical principles). Critiqued by Carol Gilligan for ignoring female moral reasoning. |
| Lev Vygotsky, Sociocultural Theory | Development occurs through social interaction. Zone of proximal development: the gap between what a child can do alone and with guidance. Scaffolding: temporary support from more knowledgeable others that is gradually removed. |
| Mary Ainsworth, Attachment Styles | Strange Situation experiment identified secure (uses mother as a base, distressed at separation, comforted at reunion), insecure-avoidant, insecure-resistant/ambivalent, and later disorganized attachment. Patterns predict later relationships. |
| Harry Harlow, Contact Comfort | Rhesus monkey experiments showed infants preferred a cloth 'mother' providing contact comfort to a wire mother providing food. Challenged behaviorist views that attachment was purely about reinforcement via feeding. |
| Sigmund Freud, Psychoanalytic Theory | Personality has three structures: id (pleasure principle), ego (reality principle), superego (morality). Five psychosexual stages (oral, anal, phallic, latency, genital). Defense mechanisms: repression, denial, projection, rationalization, sublimation. Largely unsupported empirically but historically dominant. |
| Carl Rogers, Humanistic Psychology | Emphasized free will and self-actualization. Unconditional positive regard from others supports congruence between real and ideal self. Client-centered therapy focuses on empathy, genuineness, and acceptance. Influenced modern counseling practices. |
| Abraham Maslow, Hierarchy of Needs | Five-level pyramid: physiological, safety, love/belonging, esteem, self-actualization. Lower needs must be substantially met before higher ones become primary motivators. Later added self-transcendence. Influential despite limited empirical testing. |
| Big Five (OCEAN) | The dominant trait model: Openness (imagination, curiosity), Conscientiousness (organization, discipline), Extraversion (sociability), Agreeableness (compassion, cooperation), Neuroticism (emotional instability). Stable across cultures and predictive of life outcomes. |
| Solomon Asch, Conformity | Line-judging experiments (1950s) showed approximately 37% of responses conformed to an obviously wrong group consensus. Conformity increased with group size (up to ~5), unanimity, and public responding. Demonstrated normative social influence. |
| Stanley Milgram, Obedience | Participants administered what they believed were dangerous shocks to a confederate when ordered by an authority figure. 65% went to the maximum 450 volts. Highlighted the power of situational factors and legitimate authority; ethical concerns led to major revisions in research ethics. |
| Philip Zimbardo, Stanford Prison Experiment | 1971 study assigned college students to 'guards' and 'prisoners' in a mock prison. Terminated after six days due to rapid escalation of abusive behavior by guards and breakdown among prisoners. Illustrated the power of roles, though replications and methodological critiques have tempered interpretations. |
| Fundamental Attribution Error | Tendency to attribute others' behavior to disposition (personality) while attributing our own to situation. A driver who cuts you off is 'a jerk'; when you cut someone off, you were 'late for a meeting.' More common in individualistic cultures. |
| Cognitive Dissonance (Festinger) | Discomfort from inconsistent attitudes and behaviors motivates attitude change. Classic 1959 study: participants paid $1 (not $20) to lie about a boring task later rated the task as more interesting, reducing dissonance by shifting attitudes. |
| Bystander Effect / Diffusion of Responsibility | The presence of others reduces the likelihood of any one person helping. Darley and Latané's studies (following the Kitty Genovese case) showed 5 stages of helping and identified pluralistic ignorance and diffusion of responsibility as key mechanisms. |
Clinical Psychology, Disorders and Therapy
Psychological disorders per the DSM-5-TR framework, their theoretical causes, and evidence-based treatments form modern clinical psychology.
Mood and Anxiety Disorders
Major Depressive Disorder (MDD) requires at least two weeks of depressed mood or anhedonia plus additional symptoms. Sleep disturbance, appetite changes, low energy, worthlessness, poor concentration, and suicidal ideation are key symptoms. Biological factors include low serotonin and norepinephrine. Aaron Beck identified the negative triad: negative views of self, world, and future.
Bipolar Disorder involves alternating episodes of depression and mania. Bipolar I includes full manic episodes with elevated mood, decreased sleep need, grandiosity, racing thoughts, and risky behavior. Bipolar II includes hypomania (less severe). Mood stabilizers like lithium are primary treatments.
Generalized Anxiety Disorder (GAD) involves excessive, uncontrollable worry about multiple domains for at least six months. Physical symptoms include muscle tension, restlessness, and sleep disturbance. CBT and SSRIs or SNRIs treat GAD. This differs from panic disorder, which involves sudden, intense panic attacks.
Specific Disorders
Obsessive-Compulsive Disorder (OCD) involves obsessions (recurrent, intrusive thoughts) and compulsions (repetitive behaviors to reduce anxiety). The DSM-5-TR no longer classifies OCD with anxiety disorders. Exposure and response prevention (ERP) is the frontline behavioral treatment.
Post-Traumatic Stress Disorder (PTSD) follows exposure to actual or threatened death, injury, or sexual violence. Symptoms include intrusion (flashbacks, nightmares), avoidance, negative mood and cognitions, and hyperarousal. Trauma-focused CBT and prolonged exposure therapy are evidence-based treatments.
Schizophrenia is a psychotic disorder with positive symptoms (hallucinations, delusions, disorganized speech), negative symptoms (flat affect, avolition, alogia), and cognitive impairment. The dopamine hypothesis suggests excess mesolimbic dopamine. Antipsychotics are primary treatment. Early intervention improves outcomes significantly.
Dissociative Identity Disorder (DID) involves two or more distinct personality states with associated memory gaps. Previously called multiple personality disorder. The trauma model links DID to severe, prolonged childhood trauma.
Eating and Personality Disorders
Anorexia Nervosa involves restricted food intake, significantly low body weight, intense fear of weight gain, and distorted body image. Bulimia Nervosa involves recurrent binge eating followed by compensatory behaviors (vomiting, laxatives, excessive exercise). Weight is often normal or above in bulimia.
Personality Disorders in the dramatic/erratic cluster (Cluster B) include Antisocial Personality Disorder (disregard for others' rights, often with childhood conduct disorder), Borderline Personality Disorder (instability in relationships, self-image, affect, fear of abandonment), Histrionic Personality Disorder (attention-seeking), and Narcissistic Personality Disorder (grandiosity, lack of empathy).
Autism Spectrum Disorder is a neurodevelopmental disorder with persistent deficits in social communication and interaction. Restricted, repetitive patterns of behavior are also present. Symptoms appear in early development and vary widely in severity. The DSM-5 merged previously separate diagnoses into a single spectrum.
Treatment Approaches
Cognitive-Behavioral Therapy (CBT) is an evidence-based therapy combining cognitive restructuring (identifying and challenging distorted thoughts) with behavioral techniques. Activity scheduling and exposure work alongside cognitive work. CBT is effective for depression, anxiety, PTSD, OCD, and many other conditions. Typical duration is 12-20 weekly sessions.
Aaron Beck developed cognitive therapy for depression. He identified cognitive distortions like all-or-nothing thinking, catastrophizing, and overgeneralization. His negative triad is central to cognitive theories of depression.
Psychoanalytic therapy aims to bring unconscious conflicts into awareness through free association, dream analysis, and interpretation of transference. It is long-term and intensive. Modern psychodynamic therapy is briefer and empirically supported for some conditions.
Biomedical treatments include SSRIs (fluoxetine, sertraline) for depression and anxiety. Benzodiazepines treat short-term anxiety. Antipsychotics include typical drugs (haloperidol) and atypical drugs (risperidone, olanzapine). Mood stabilizers (lithium, valproate) treat bipolar disorder. Electroconvulsive therapy (ECT) helps treatment-resistant depression. Transcranial magnetic stimulation (TMS) helps refractory cases.
Underlying Models
The diathesis-stress model states that psychological disorders result from biological predisposition (diathesis) interacting with environmental stressors. This explains why not everyone with genetic vulnerability develops a disorder and why identical twins can differ.
The biopsychosocial model emphasizes that health and disorders arise from interacting biological, psychological, and social factors. This opposes purely biomedical models. It guides modern integrative treatment planning that considers medication, therapy, family systems, and cultural context.
| Term | Meaning |
|---|---|
| Major Depressive Disorder (MDD) | At least two weeks of depressed mood or anhedonia plus additional symptoms (sleep, appetite, energy, worthlessness, concentration, suicidal ideation). Biological factors include low serotonin and norepinephrine; cognitive factors include Beck's negative triad (negative view of self, world, future). |
| Bipolar Disorder | Alternating episodes of depression and mania (bipolar I) or hypomania (bipolar II). Manic episodes feature elevated mood, decreased need for sleep, grandiosity, racing thoughts, and risky behavior. Often treated with mood stabilizers like lithium. |
| Generalized Anxiety Disorder (GAD) | Excessive, uncontrollable worry about multiple domains for at least six months, with physical symptoms (muscle tension, restlessness, sleep disturbance). Treated with CBT and SSRIs/SNRIs or buspirone. Distinct from panic disorder (sudden, intense panic attacks). |
| Obsessive-Compulsive Disorder (OCD) | Obsessions (recurrent, intrusive thoughts) and/or compulsions (repetitive behaviors performed to reduce anxiety). No longer classified with anxiety disorders in DSM-5-TR. Exposure and response prevention (ERP) is the frontline behavioral treatment. |
| Post-Traumatic Stress Disorder (PTSD) | Follows exposure to actual or threatened death, injury, or sexual violence. Symptoms: intrusion (flashbacks, nightmares), avoidance, negative mood/cognitions, hyperarousal. Trauma-focused CBT and prolonged exposure therapy are evidence-based treatments. |
| Schizophrenia | Psychotic disorder with positive symptoms (hallucinations, delusions, disorganized speech), negative symptoms (flat affect, avolition, alogia), and cognitive impairment. Dopamine hypothesis: excess mesolimbic dopamine. Treated primarily with antipsychotics; early intervention improves outcomes. |
| Dissociative Identity Disorder (DID) | Two or more distinct personality states with associated memory gaps. Previously called multiple personality disorder. Controversial diagnosis; strongly associated with severe, prolonged childhood trauma per the trauma model. |
| Anorexia Nervosa vs. Bulimia Nervosa | Anorexia: restricted food intake, significantly low body weight, intense fear of gaining weight, distorted body image. Bulimia: recurrent binge eating followed by compensatory behaviors (vomiting, laxatives, excessive exercise); weight often normal or above. |
| Personality Disorders (DSM Cluster B) | Dramatic/erratic cluster: antisocial (disregard for others' rights, often childhood conduct disorder), borderline (instability in relationships, self-image, affect; fear of abandonment), histrionic (attention-seeking), narcissistic (grandiosity, lack of empathy). |
| Autism Spectrum Disorder | Neurodevelopmental disorder with persistent deficits in social communication and interaction, plus restricted, repetitive patterns of behavior. Symptoms present in early development, vary widely in severity. DSM-5 merged previously separate diagnoses into a single spectrum. |
| Cognitive-Behavioral Therapy (CBT) | Evidence-based therapy combining cognitive restructuring (identifying and challenging distorted thoughts) with behavioral techniques (activity scheduling, exposure). Effective for depression, anxiety, PTSD, OCD, and many other conditions. Typically 12-20 weekly sessions. |
| Aaron Beck, Cognitive Therapy | Developed cognitive therapy for depression. Identified cognitive distortions like all-or-nothing thinking, catastrophizing, and overgeneralization. His negative triad (negative views of self, world, future) is central to cognitive theories of depression. |
| Psychoanalytic Therapy | Freudian technique aimed at bringing unconscious conflicts into awareness through free association, dream analysis, and interpretation of transference. Long-term and intensive; modern psychodynamic therapy is briefer and empirically supported for some conditions. |
| Biomedical Treatments | SSRIs (fluoxetine, sertraline) for depression and anxiety. Benzodiazepines (short-term anxiety). Antipsychotics (typical: haloperidol; atypical: risperidone, olanzapine). Mood stabilizers (lithium, valproate) for bipolar. ECT for treatment-resistant depression. TMS (transcranial magnetic stimulation) for refractory cases. |
| Diathesis-Stress Model | Psychological disorders result from the interaction of a biological predisposition (diathesis) and environmental stressors. Explains why not everyone with a genetic vulnerability develops a disorder and why identical twins can be discordant. |
| Biopsychosocial Model | Health and disorders arise from interacting biological, psychological, and social factors. Opposed to purely biomedical models. Guides modern integrative treatment planning that considers medication, therapy, family systems, and cultural context. |
How to Study ap psychology Effectively
Mastering AP Psychology requires the right study approach, not just more hours. Research in cognitive science shows three techniques produce the best learning outcomes: active recall (testing yourself rather than re-reading), spaced repetition (reviewing at scientifically-optimized intervals), and interleaving (mixing related topics rather than studying one in isolation).
Why Active Recall Beats Passive Review
FluentFlash is built around all three principles. When you study AP Psychology with our FSRS algorithm, every term is scheduled for review at exactly the moment you are about to forget it. This maximizes retention while minimizing study time.
The most common mistake students make is relying on passive review methods. Re-reading your notes, highlighting textbook passages, or watching lecture videos feels productive. However, studies show these methods produce only 10 to 20 percent of the retention that active recall achieves. Flashcards force your brain to retrieve information, which strengthens memory pathways far more than recognition alone.
Pair active recall with spaced repetition scheduling, and you can learn in 20 minutes a day what would take hours of passive review.
Building Your Study Plan
A practical study plan for AP Psychology starts with creating 15 to 25 flashcards covering the highest-priority concepts. Review them daily for the first week using FSRS scheduling. As cards become easier, intervals automatically expand from minutes to days to weeks. You will always be working on material at the edge of your knowledge.
After 2 to 3 weeks of consistent practice, AP Psychology concepts become automatic rather than effortful to recall. This builds the fluency needed for both multiple-choice and free-response sections of the exam.
- Generate flashcards using FluentFlash AI or create them manually from your notes
- Study 15 to 20 new cards per day, plus scheduled reviews
- Use multiple study modes (flip, multiple choice, written) to strengthen recall
- Track your progress and identify weak topics for focused review
- Review consistently: daily practice beats marathon sessions
- 1
Generate flashcards using FluentFlash AI or create them manually from your notes
- 2
Study 15-20 new cards per day, plus scheduled reviews
- 3
Use multiple study modes (flip, multiple choice, written) to strengthen recall
- 4
Track your progress and identify weak topics for focused review
- 5
Review consistently, daily practice beats marathon sessions
Why Flashcards Work Better Than Other Study Methods for ap psychology
Flashcards are one of the most research-backed study tools for any subject, including AP Psychology. The reason comes down to how memory works.
The Testing Effect
When you read a textbook passage, your brain stores that information in short-term memory. Without retrieval practice, it fades within hours. Flashcards force retrieval, which is the mechanism that transfers information from short-term to long-term memory.
The testing effect, documented in hundreds of peer-reviewed studies, shows that students who study with flashcards consistently outperform those who re-read by 30 to 60 percent on delayed tests. This is not because flashcards contain more information. It is because retrieval strengthens neural pathways in ways that passive exposure cannot.
Every time you successfully recall an AP Psychology concept from a flashcard, you make that concept easier to recall next time. The neural pathway strengthens with each retrieval attempt.
FSRS Spaced Repetition Amplifies Results
FluentFlash amplifies this effect with the FSRS algorithm, a modern spaced repetition system. It schedules reviews at mathematically-optimal intervals based on your actual performance. Cards you find easy get pushed further into the future. Cards you struggle with come back sooner.
Over time, this builds remarkable retention with minimal time investment. Students using FSRS-based systems typically retain 85 to 95 percent of material after 30 days. This compares to roughly 20 percent retention from passive review alone. The difference is not just significant, it is transformative for exam preparation.