AP Psychology 2024/2025 Exam Preparation Notes

Hypothesis: A tentative explanation that must be falsifiable; it can be supported or rejected.

Operational Definition: A clear, precise, quantifiable definition of variables to enable replication and ensure reliable data collection.

Qualitative data: Descriptive information (e.g., eye color).

Quantitative data: Numerical information, ideal for statistical analysis.

Population: The entire group the research applies to.

Sample: The specific group chosen for the study.

Research Designs

Correlation: Examines the relationship between two variables.
Advantages: Useful when experiments are unethical.
Disadvantages: Correlation does not equal causation.
Directionality Problem: Uncertainty about which variable influences the other (e.g., does depression cause low self-esteem or vice versa?).
Third Variable Problem: A different variable could be responsible for the observed relationship.
Types: Positive Correlation: Both variables increase or decrease together.
Negative Correlation: As one variable increases, the other decreases.

The correlation strength is measured between -1 and 1.

Experiments: Manipulates variables to assess cause and effect.
Advantages: Establishes cause and effect.
Disadvantages: Can be unethical or too artificial.
Independent Variable (IV): Variable manipulated by the researcher.
Experimental Group: Receives treatment; can include multiple experimental groups.
Control Group: Receives placebo; there is only one per experiment.
Dependent Variable (DV): What is measured; it depends on the IV.

Placebo Effect: Observed effects that occur due to the belief in the treatment's efficacy.

Blinding:
Double-Blind: Neither participants nor experimenters know the assignments.
Single-Blind: Only the participants are unaware of assignments.

Confounds: Errors or flaws introduced unintentionally in the study.

Random Assignment: Enhances representation in groups, allowing cause and effect claims.

Other Study Types

Naturalistic Observation: Observes behavior in natural settings.
Advantages: High external validity.
Disadvantages: No cause-and-effect conclusions.

Case Study: In-depth study of one individual.
Advantages: Extensive information.
Disadvantages: Limited external validity.

Meta-Analysis: Combines findings from multiple studies for larger sample size and effect analysis.

Statistics

Descriptive Statistics: Show data distributions.
Measures of Central Tendency:
Mean: Average (uses in normal distribution).
Median: Middle value (used in skewed distributions).
Mode: Most frequent value.

Examples of skewness:
Negative skew: Mean is less than median; mode is higher.
Positive skew: Mean is greater than median; mode is lower.

Measure of Variation:
Range: Difference between smallest and largest values.
Standard Deviation: Average distance of scores from the mean.

Inferential Statistics: Assess significance.
Statistical Significance: Results are unlikely due to chance; indicated by p<.05 and lower values indicate stronger significance.
Effect Size: Indicates practical significance; higher values suggest more substantial impacts.

Ethical Guidelines (IRB Approval Required)

Confidentiality: Participant information must remain private.

Informed Consent: Participants must agree willingly to partake in studies.

Informed Assent: Required consent from minors and their guardians.

Debriefing: Participants must learn the true purpose of the study post-experiment, especially if deceived.

No Harm Rule: Participants should not suffer mental or physical harm.

Additional Vocabulary

Surveys: Often produce correlation data but are subject to self-report bias due to social desirability and wording effects.

Random Sampling: Method for selecting participants, giving everyone a chance to participate.

Representative Sample: Mimics the population’s demographics.

Convenience Sample: Participants chosen for their availability, which may lead to bias.

Cultural Norms: The behaviors of a group that may influence research outcomes.

Bias Identifications:
Confirmation Bias: Filtering only supporting information for pre-existing beliefs.
Hindsight Bias: “I knew it all along” effect.
Overconfidence: Overestimating knowledge or abilities.
Hawthorne Effect: Behaviors change when participants know they are being observed.

Research Requirements

Research must undergo peer review and utilize adequate sample sizes.

Important Distinction:
Random Sample = Generalizability
Random Assignment = Cause/Effect

Biological Basis Pillar

NT = Neurotransmitter, AP = Action Potential, NS = Nervous System

Heredity vs Environment

Evolutionary Psychology: Studies how evolution through natural selection affects behavior.

Heredity (Nature): How genetics impact behavior.

Environment (Nurture): How external situations guide behavior. The consensus in psychology is that both aspects play a role.

Twin/Adoption Studies:
Genetics: Identical twins show higher disease similarity.
Environment: Identical twins in different environments display discrepancies.

Nervous System

Central Nervous System: Comprised of the brain and spinal cord.

Peripheral Nervous System: Includes everything else; relays information to the central nervous system.
Somatic Nervous System: Coordinates voluntary movements via sensory and motor functions.
Autonomic Nervous System: Regulates involuntary functions (heart, lungs, etc.). Includes:

Sympathetic Nervous System: Activates fight or flight responses.
Parasympathetic Nervous System: Manages rest and digest activities.

Neurons and Neural Firing

Neuron: The basic cell of the nervous system.
Dendrites: Receive incoming neurotransmitters.
Axon: Pathway for action potentials.
Myelin Sheath: Insulates and speeds up action potentials along the axon.
Synapse: The gap between neurons.

Types of Neurons:
Sensory Neurons: Receive signals from the environment.
Motor Neurons: Send signals to induce movement from the brain.
Interneurons: Involved in reflex arcs, bypassing the brain for quicker responses (e.g., touching something hot).

Glia Cells: Provide support and nutrients to neurons.

Neural Firing: Neuronal firing consists of various stages, starting from resting potential, shifting to depolarization, and reaching action potential thresholds. Upon triggering, action potentials move down the axon until reaching the synapse for neurotransmitter release.

Refractory Period: Time taken for a neuron to reset after firing.

Neurotransmitters: Chemicals released in the synapse, classified as excitatory or inhibitory.
Major transmitters include:

GABA: Inhibitory neurotransmitter.

Glutamate: Excitatory neurotransmitter.

Dopamine: Related to reward and movement; involved in addiction.

Serotonin: Influences mood and sleep; low levels are associated with depression.

Acetylcholine (ACh): Important for memory and movement; deficits are tied to Alzheimer’s.

Norepinephrine: Neurotransmitter for sympathetic nervous system activity; low levels may lead to depressive symptoms.

Endorphins: Natural pain relievers.

Substance P: Involved in pain perception and regulation.

Hormones

Hormones are distinct from neurotransmitters, often regulating longer-term bodily functions:
Oxytocin: Involvement in social bonding and childbirth.
Adrenaline: Key player in fight or flight responses.
Leptin: Signals satiety to stop eating.
Ghrelin: Triggers hunger cues.
Melatonin: Regulates sleep cycles.

Agonists: Drugs that mimic neurotransmitters.

Antagonists: Drugs which block neurotransmitter sites.

Reuptake: Unused neurotransmitters are absorbed back into the neuron.

Psychoactive Drugs

Types:
Depressants: Lower nervous system activity (e.g., alcohol).
Stimulants: Increase nervous system activity (e.g., caffeine, cocaine).
Hallucinogens: Alter perceptions (e.g., LSD, marijuana).
Opioids: Relieve pain (e.g., heroin).

Tolerance: Needing more of a substance to achieve the same effect.

Addiction: Compulsion to engage in substance use to avoid withdrawal symptoms.

Withdrawal: Symptoms experienced upon cessation of substance use.

The Brain

Cerebellum: Coordinates movement, balance, and procedural memory.

Brainstem / Medulla: Controls vital functions such as heartbeat and respiration.

Reticular Activating System: Manages alertness and arousal.

Cerebral Cortex: Outermost layer, responsible for higher-level cognitive functions; consists of:
Limbic System: Includes the amygdala (emotion), hippocampus (memory), and others.

Lobes:
Occipital Lobe: Responsible for vision.

Frontal Lobe: Involved in decision-making, planning, and personality; includes apps prefrontal cortex (high-level decision-making).
Motor Cortex: Located in the back of the frontal lobe, controlling skeletal muscle movement.
Parietal Lobe: Processes touch and sensations.
Temporal Lobe: Responsible for hearing and language recognition.

Brain Plasticity

The brain can change in response to experience or damage (neuroplasticity).

Diseases and Disorders to Know

Multiple Sclerosis: Deterioration of myelin sheath affecting neural transmission.

Myasthenia Gravis: Blockade of acetylcholine affecting muscle control.

Blindsight: Ability to respond to visual stimuli while not consciously seeing due to cortical damage.

Phantom Limb Pain: Pain perceived in a limb that has been amputated, linked to brain plasticity.

Sleep

Consciousness: Awareness of cognitive processes such as being awake or asleep.

Circadian Rhythms: Biological clock regulating bodily functions in a 24-hour cycle.

Types of Sleep:
NREM: Stages of light to deep sleep.
REM: Associated with dreaming and cognitive processing.

Sleep Disorders:
Insomnia: Inability to fall or stay asleep.
Sleep Apnea: Breathing disruptions during sleep.
Narcolepsy: Sudden transitions into REM.

Sensation

Sensation: Received stimulus energy converting into neural impulses.

Perception: Interpretation of sensory input.

Absolute Threshold: Minimum stimulus detected 50% of the time.

Weber’s Law: Perception of differences is proportional to stimulus intensity.

Synesthesia: Interference of different sensory modalities.

Visual System

Lens: Focuses light on the retina containing photoreceptors (rods and cones).

Fovea: Area of sharpest vision.

Color Vision Theories:
Trichromatic Theory: Color perception depends on three types of cones (red, green, blue).
Opponent Process Theory: Accounts for complementary color processing.

Auditory System

Sound Properties:
Wavelength: Determines pitch.
Amplitude: Determines loudness.

Theories of Sound:
Place Theory: Different frequencies stimulate different places on the cochlea.
Frequency Theory: The rate of action potentials corresponds to pitch.

Cognition

Perception: Involves processes of recognition and labeling sensory inputs.

Gestalt Psychology: Proposes that the whole is greater than the sum of its parts.

Thinking and Problem Solving: Involves cognitive strategies, including algorithms and heuristics to arrive at solutions.

Intelligence and Achievement

Theories of Intelligence:
Single Form of Intelligence (g factor): General intelligence affecting all mental abilities.
Multiple Intelligences: Various types of intelligence including verbal, spatial, mathematical etc.

Development

Piaget's Theory of Cognitive Development: Four stages from sensorimotor to formal operational.

Social Psychology

Attribution Theory: Explains the reasoning behind behaviors and how personality is perceived.

Group Dynamics: Studies interactions in groups, including conformity and obedience.

Personality Theories

Trait Theory: Examines enduring personality factors (e.g., Big Five).
Humanistic: Emphasizes individual growth and potential development.

Treatment of Disorders

Different therapeutic perspectives including psychodynamic, biological, and cognitive-behavioral therapies to treat various disorders.