Ch. 1: The Science of Psychology

Main Goals of Psychology

Psychology is the scientific study of behavior and mental processes. The main goals are:

• Describe: Observe and describe behaviors and mental processes as they occur.

• Explain: Understand and explain why these behaviors and processes occur.

• Predict: Anticipate future behaviors based on observed patterns.

• Control: Use knowledge to influence or control behaviors in beneficial ways.

Psychological Perspectives

• Biological: Focuses on the brain, nervous system, and genetics.

• Behavioral: Emphasizes observable behaviors and the effects of learning.

• Cognitive: Studies mental processes like thinking, memory, and problem-solving.

• Humanistic: Highlights personal growth and self-actualization.

• Psychodynamic: Examines unconscious drives and early childhood experiences.

• Sociocultural: Considers social and cultural influences on behavior.

• Evolutionary: Explores how natural selection influences behavior.

Psychological Professionals

• Psychologists: Hold doctoral degrees; may specialize in research, clinical, counseling, or academic roles.

• Psychiatrists: Medical doctors who can prescribe medication and treat psychological disorders.

• Other Professionals: Includes psychiatric social workers, counselors, and therapists.

Criteria for Critical Thinking

• Ask questions and be willing to wonder.

• Define terms clearly.

• Examine evidence and analyze assumptions.

• Avoid emotional reasoning and oversimplification.

• Consider alternative explanations.

Ethical Practices in Research

• Obtain informed consent from participants.

• Ensure confidentiality and privacy.

• Minimize harm and maximize benefits.

• Debrief participants after the study.

Subjects, Samples, and Populations

• Population: The entire group of interest.

• Sample: A subset of the population selected for study.

• Subjects: Individuals who participate in the research.

Dependent and Independent Variables

• Independent Variable (IV): The variable manipulated by the researcher.

• Dependent Variable (DV): The variable measured to assess the effect of the IV.

• Example: In a study on sleep and memory, hours of sleep (IV) and test scores (DV).

Experimental and Control Groups

• Experimental Group: Receives the treatment or manipulation.

• Control Group: Does not receive the treatment; serves as a baseline.

Research Designs and Methods

• Descriptive: Observational, case studies, surveys.

• Correlational: Examines relationships between variables.

• Experimental: Manipulates variables to determine cause and effect.

The Scientific Method

• Formulate a question.

• Develop a hypothesis.

• Test the hypothesis through research.

• Analyze data and draw conclusions.

• Report findings.

Correlations and Types

• Positive Correlation: Both variables increase or decrease together.

• Negative Correlation: One variable increases as the other decreases.

• Zero Correlation: No relationship between variables.

• Correlation Coefficient: Ranges from -1.0 to +1.0; closer to ±1 indicates stronger relationship.

Additional info: Correlation does not imply causation.

Ch. 2: The Biological Perspective

Types of Neurons

• Sensory Neurons (Afferent): Carry information from sensory receptors to the brain and spinal cord.

• Motor Neurons (Efferent): Transmit commands from the brain to muscles and glands.

• Interneurons: Connect sensory and motor neurons within the central nervous system.

Components of Neurons

• Dendrites: Receive signals from other neurons.

• Cell Body (Soma): Contains the nucleus and maintains cell health.

• Axon: Transmits electrical impulses away from the cell body.

• Myelin Sheath: Insulates axons, speeding up signal transmission.

• Axon Terminals: Release neurotransmitters to communicate with other cells.

The Human Nervous System

• Central Nervous System (CNS): Brain and spinal cord; processes information.

• Peripheral Nervous System (PNS): All nerves outside the CNS; includes somatic and autonomic systems.

• Somatic Nervous System: Controls voluntary movements.

• Autonomic Nervous System: Regulates involuntary functions (e.g., heart rate, digestion).

• Sympathetic Division: Activates "fight or flight" response.

• Parasympathetic Division: Promotes "rest and digest" functions.

Brain Structures and Functions

• Brain Stem: Controls basic life functions (e.g., breathing, heartbeat).

• Cortex: Involved in higher-order thinking, perception, and voluntary movement.

• Limbic System: Regulates emotions, motivation, and memory (includes amygdala, hippocampus).

Brain Scans/Imaging Methods

• EEG (Electroencephalogram): Measures electrical activity in the brain.

• CT (Computed Tomography): Uses X-rays to create brain images.

• MRI (Magnetic Resonance Imaging): Uses magnetic fields for detailed brain images.

• PET (Positron Emission Tomography): Shows brain activity using radioactive tracers.

• fMRI (Functional MRI): Measures brain activity by detecting changes in blood flow.

Ch. 3: Sensation and Perception

Depth Perception Cues

• Monocular Cues: Require one eye (e.g., linear perspective, texture gradient).

• Binocular Cues: Require both eyes (e.g., retinal disparity, convergence).

Sensation vs. Perception

• Sensation: The process by which sensory receptors receive stimuli from the environment.

• Perception: The interpretation and organization of sensory information by the brain.

• Example: Hearing a sound (sensation) and recognizing it as music (perception).

Size vs. Shape Constancy

• Size Constancy: Perceiving an object as the same size despite changes in distance.

• Shape Constancy: Recognizing an object as the same shape even when its image on the retina changes.

Top-Down & Bottom-Up Perceptual Processing

• Bottom-Up Processing: Analysis begins with sensory input and builds up to perception.

• Top-Down Processing: Perception is guided by prior knowledge, experience, and expectations.

• Example: Reading messy handwriting using context (top-down) vs. recognizing letters (bottom-up).

Ch. 4: Consciousness

Consciousness (Defined)

• Consciousness: Awareness of oneself and the environment, including thoughts, feelings, and sensations.

Types of Sleep Disorders

• Insomnia: Difficulty falling or staying asleep.

• Sleep Apnea: Breathing interruptions during sleep.

• Narcolepsy: Sudden, uncontrollable sleep attacks.

• Night Terrors: Episodes of intense fear during sleep, often in children.

REM vs. Non-REM Sleep

• REM (Rapid Eye Movement) Sleep: Dreaming occurs; brain activity resembles wakefulness.

• Non-REM Sleep: Includes stages 1–4; restorative functions, less vivid dreams.

Sleep Stages/Brain Waves

• Stage 1: Light sleep; theta waves.

• Stage 2: Sleep spindles; deeper relaxation.

• Stages 3 & 4: Deep sleep; delta waves.

• REM Sleep: Beta-like waves; vivid dreams.

Manifest & Latent Content

• Manifest Content: The literal storyline of a dream.

• Latent Content: The hidden psychological meaning of a dream (Freud).

Drugs/Categories/Effects

• Stimulants: Increase nervous system activity (e.g., caffeine, nicotine, cocaine).

• Depressants: Decrease nervous system activity (e.g., alcohol, barbiturates).

• Narcotics: Relieve pain and induce sleep (e.g., morphine, heroin).

• Hallucinogens: Alter perception and cause hallucinations (e.g., LSD, marijuana).

Substance Use Concepts

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

• Dependence: Physical or psychological need for a substance.

• Withdrawal: Symptoms that occur when stopping use of a substance.

Ch. 5: Learning

Learning (Defined)

• Learning: A relatively permanent change in behavior due to experience.

Learned Helplessness

• When exposure to uncontrollable events leads to passive behavior and a sense of powerlessness.

• Example: Dogs in Seligman's experiments stopped trying to escape shocks after repeated failures.

Reinforcement and Punishment

• Reinforcement: Increases the likelihood of a behavior.

• Punishment: Decreases the likelihood of a behavior.

• Positive: Adding a stimulus.

• Negative: Removing a stimulus.

• Example: Giving candy for good behavior (positive reinforcement); taking away chores for good grades (negative reinforcement).

Schedules of Reinforcement

Observational and Latent Learning

• Observational Learning: Learning by watching others (modeling).

• Latent Learning: Learning that occurs without immediate reinforcement and is not demonstrated until needed.

• Example: Children learning aggressive behaviors by observing adults (Bandura's Bobo doll experiment).

Notable Names in Behaviorism

• Ivan Pavlov: Classical conditioning with dogs.

• John B. Watson: Behaviorism; Little Albert experiment.

• B.F. Skinner: Operant conditioning; Skinner box.

• Albert Bandura: Observational learning; social learning theory.

Classical and Operant Conditioning

• Classical Conditioning: Learning through association; a neutral stimulus becomes associated with a meaningful stimulus.

• Operant Conditioning: Learning through consequences; behaviors are shaped by reinforcement or punishment.

• Example (Classical): Pavlov's dogs salivating to a bell.

• Example (Operant): Rats pressing a lever for food.

Additional info: Classical conditioning involves involuntary responses, while operant conditioning involves voluntary behaviors.