Psychology I – Complete Master Review: Core Concepts, Methods, and Approaches

Introducing Psychological Science

Definition and Scope

Psychology is the scientific study of behavior and mental processes. It is grounded in empirical research, critical thinking, and the application of the scientific method to understand individuals and groups.

• Empiricism: Knowledge comes from observation and experience.

• Core Approaches: Biological, psychological, and social/environmental factors all influence behavior.

• Major Philosophical Ideas: Rationalism, empiricism, determinism, and materialism shape psychological inquiry.

Reading and Evaluating Scientific Research

The Scientific Method

The scientific method is a systematic process for investigating phenomena, acquiring new knowledge, or correcting and integrating previous knowledge.

• Steps: Theory → Hypothesis → Test Hypothesis (reject/confirm) → Revise Theory → Generate New Hypothesis

• Hypothesis: A testable prediction about processes that can be observed and measured.

• Falsifiability: Hypotheses must be precise enough to be disproven.

• Replication: Repeating studies to confirm findings and ensure reliability.

Critical Thinking

• Involves skepticism, curiosity, and the evaluation of evidence.

• Key steps: Be curious, examine evidence, avoid emotional thinking, consider alternative viewpoints.

• Application: Why is this relevant? Can we critically evaluate this evidence?

Biological Psychology

The Nervous System

The nervous system is a complex network of neurons that conveys electrochemical information throughout the body.

• Central Nervous System (CNS): Brain and spinal cord; center for processing and integrating information.

• Peripheral Nervous System (PNS): Nerves outside the CNS; includes the somatic (voluntary movement) and autonomic (involuntary functions) systems.

• Autonomic Nervous System: Divided into sympathetic (arousal, stress) and parasympathetic (rest, digestion) divisions.

Neurons and Neural Communication

• Neurons: Specialized cells that transmit information via electrochemical signals.

• Types: Sensory neurons (receive information), motor neurons (send signals to muscles), interneurons (connect neurons).

• Structure: Soma (cell body), dendrites (receive signals), axon (sends signals), myelin sheath (insulates axon).

• Action Potential: Rapid change in voltage across a neuron’s membrane; follows the sequence of depolarization and repolarization.

• Synapse: Gap between neurons where neurotransmitters are released.

Neurotransmission and Drug Effects

• Neurotransmitters: Chemical messengers (e.g., dopamine, serotonin, GABA) that influence neural activity.

• Agonists: Drugs that enhance neurotransmitter activity.

• Antagonists: Drugs that block neurotransmitter activity.

Sensation and Perception

Psychophysics

Psychophysics studies the relationship between physical stimuli and perception.

• Sensation: Detection of external stimuli by sense organs.

• Perception: Interpretation and organization of sensory information.

• Key Figures: Ernst Weber (Weber’s Law), Gustav Fechner, Stanley Stevens (Stevens’ Power Law).

Principles of Perception

• Gestalt Principles: Figure-ground, proximity, similarity, continuity, closure.

• Bottom-up Processing: Building perception from sensory input.

• Top-down Processing: Using prior knowledge to interpret sensory information.

• Signal Detection Theory: Perception depends on stimulus intensity, background noise, and decision criteria.

Types of Sensory Stimuli

• Vision: Light waves detected by photoreceptors in the retina.

• Hearing: Sound waves detected by hair cells in the cochlea.

• Taste: Chemicals detected by taste buds.

• Smell: Chemicals detected by olfactory receptors.

• Touch: Pressure, temperature, pain detected by skin receptors.

Central Tendency, Descriptive & Inferential Statistics

Descriptive Statistics

• Frequency: How often a score occurs; shown in frequency distributions.

• Measures of Central Tendency: Mean (arithmetic average), median (middle score), mode (most frequent score).

• Skewed Distributions: Mean, median, and mode are not the same.

Inferential Statistics & Hypothesis Testing

• Inferential Statistics: Used to determine whether results are likely due to chance.

• Statistical Significance: Commonly defined as $p < 0.05$.

• Hypothesis Testing: Researchers use inferential statistics to accept or reject hypotheses.

Brain Structures and Functions

Major Brain Regions

• Hindbrain: Controls basic functions (respiration, heart rate, sleep).

• Pons: Sleep, wake cycle, connects hindbrain and forebrain.

• Medulla: Breathing, heart rate, swallowing.

• Cerebellum: Coordination, balance, timing of movements.

• Forebrain: Higher cognitive functions; includes cerebral cortex, thalamus, limbic system.

• Thalamus: Relay station for sensory information.

• Limbic System: Emotion, motivation, memory (includes amygdala, hippocampus).

• Basal Ganglia: Movement and reward processing.

Genetics and Behavior

Genetic Foundations

• Genes: Segments of DNA that code for proteins and influence traits.

• Genotype: Genetic makeup of an organism.

• Phenotype: Observable characteristics resulting from genotype and environment.

• Heritability: Proportion of variation in traits due to genetic factors.

Evolutionary Psychology

Natural Selection and Behavior

• Explains behavior as a result of adaptation to environmental pressures.

• Traits that increase survival and reproduction are more likely to be passed on.

History, Core Ideas, Approaches, and Major Psychologists

Early Schools of Psychology

• Structuralism: Wilhelm Wundt, Edward Titchener; focus on breaking down mental processes.

• Functionalism: William James; influenced by Darwin, focus on function of behavior.

• Behaviorism: John B. Watson, B.F. Skinner; focus on observable behavior and learning.

• Psychoanalysis: Sigmund Freud; focus on unconscious mind and early experiences.

• Humanistic: Carl Rogers, Abraham Maslow; focus on personal growth and self-actualization.

• Cognitive: Focus on thinking, memory, problem solving.

• Gestalt: Focus on perception and holistic processing.

Major Approaches in Psychology

• Biological: Genes, brain, neurotransmitters.

• Cognitive: Memory, learning, thinking.

• Behavioral: Observable behavior, reinforcement, punishment.

• Psychoanalytic: Unconscious motives, childhood experiences.

• Humanistic: Self-concept, personal growth.

• Evolutionary: Survival value, adaptation.

• Socio-cultural: Influence of culture, social norms.

Learning

Classical Conditioning

• Ivan Pavlov: Learning by association; pairing a neutral stimulus with a reflexive response.

Operant Conditioning

• B.F. Skinner: Learning through consequences.

• Reinforcement: Increases behavior (positive: adding pleasant, negative: removing unpleasant).

• Punishment: Decreases behavior (positive: adding unpleasant, negative: removing pleasant).

Types of Psychologists

• Clinical

• Counseling

• Developmental

• Experimental

• Biological/Neuropsychological

• Industrial-organizational

Additional info:

• Some content inferred and expanded for clarity and completeness, including definitions, examples, and context for major theories and approaches.