Introduction to Psychology

Definition and Goals

Psychology is the scientific study of behavior and mental processes. The field aims to understand individuals and groups by establishing general principles and researching specific cases.

• Describe behavior: Observe and detail what people do.

• Explain behavior: Understand the causes of behavior.

• Predict behavior: Anticipate future actions based on knowledge.

• Control/Influence behavior: Apply psychological principles ethically to influence behavior.

Major Perspectives in Psychology

Psychology uses multiple perspectives to explain behavior and mental processes:

Psychology Research

Types of Research Methods

• Experiment: Determines cause and effect by manipulating variables.

• Correlational Study: Measures the relationship between variables (does not prove causation).

• Case Study: In-depth analysis of a single person or group.

• Naturalistic Observation: Observing behavior in its natural environment without interference.

• Survey: Collects self-reported data from participants.

Key Research Terms

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

• Dependent Variable (DV): The measured outcome.

• Control Group: Group not exposed to the IV; used for comparison.

• Experimental Group: Group exposed to the IV.

• Random Assignment: Randomly placing participants in groups to reduce bias.

• Placebo Effect: Changes in behavior due to expectations, not the treatment itself.

• Double-Blind Study: Neither participants nor researchers know group assignments, reducing bias.

Correlation

• Positive Correlation (+): Both variables increase together.

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

• Zero Correlation: No relationship between variables.

Important: Correlation does not imply causation.

Biological Psychology

The Brain and Nervous System

• Central Nervous System (CNS): Consists of the brain and spinal cord.

• Peripheral Nervous System (PNS): Connects CNS to the rest of the body.

Major Brain Structures

• Frontal Lobe: Planning, personality, decision making, motor movement.

• Parietal Lobe: Touch and body sensations.

• Temporal Lobe: Hearing, memory, language.

• Occipital Lobe: Vision.

• Cerebellum: Balance and coordination.

• Brainstem: Breathing, heart rate, survival functions.

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

Consciousness and Sleep

States of Consciousness

• Conscious awareness

• Sleep

• Dreams

• Hypnosis

• Meditation

• Psychoactive drugs

Sleep Stages

• NREM Sleep: Includes Stage 1, Stage 2, and Stage 3 (deep sleep).

• REM Sleep: Characterized by dreaming, high brain activity, and memory consolidation.

Sensation and Perception

Definitions

• Sensation: Detecting physical stimuli from the environment.

• Perception: Interpreting and organizing sensory information.

Pathways

• Vision: Cornea → Pupil → Lens → Retina → Optic Nerve → Brain

• Hearing: Outer Ear → Middle Ear → Cochlea → Auditory Nerve

Perceptual Principles

• Figure-Ground

• Depth Perception

• Perceptual Constancy

• Gestalt Principles

Learning

Classical Conditioning (Pavlov)

• Unconditioned Stimulus (US): Naturally triggers a response.

• Unconditioned Response (UR): Natural reaction to the US.

• Conditioned Stimulus (CS): Previously neutral, now triggers response after association.

• Conditioned Response (CR): Learned response to the CS.

Example: Bell (CS) + Food (US) → Salivation (UR/CR)

Operant Conditioning (Skinner)

Behavior is shaped by consequences.

• Reinforcement: Increases behavior

  • Positive Reinforcement: Add something pleasant

  • Negative Reinforcement: Remove something unpleasant

• Punishment: Decreases behavior

  • Positive Punishment: Add unpleasant consequence

  • Negative Punishment: Remove pleasant consequence

Observational Learning (Bandura)

• Learning by watching others (modeling).

Memory

Three Stages of Memory

• Encoding: Processing information into memory.

• Storage: Maintaining information over time.

• Retrieval: Accessing stored information.

Types of Memory

• Explicit Memory: Facts and events (conscious recall).

• Implicit Memory: Skills and habits (unconscious recall).

Forgetting

• Interference

• Decay

• Retrieval Failure

Cognition and Intelligence

Intelligence Tests

• IQ measures cognitive ability; average IQ = 100.

Gardner's Multiple Intelligences

• Linguistic

• Logical-Mathematical

• Musical

• Spatial

• Bodily-Kinesthetic

• Interpersonal

• Intrapersonal

• Naturalistic

Emotional Intelligence (EQ)

• Recognize emotions

• Understand emotions

• Manage emotions

Developmental Psychology

Piaget's Cognitive Stages

Erikson's Psychosocial Stages

• Trust vs. Mistrust

• Autonomy vs. Shame

• Initiative vs. Guilt

• Industry vs. Inferiority

• Identity vs. Role Confusion

Emotion and Motivation

Maslow's Hierarchy of Needs

1. Physiological Needs

2. Safety

3. Love/Belonging

4. Esteem

5. Self-Actualization

Theories of Emotion

• James-Lange: Body reacts first, then emotion is experienced.

• Cannon-Bard: Emotion and physiological response occur simultaneously.

• Schachter-Singer (Two-Factor): Emotion = physiological arousal + cognitive label.

Personality

Freud's Psychoanalytic Theory

• Id: Instinctual drives, pleasure principle.

• Ego: Reality principle, mediates between id and superego.

• Superego: Moral standards.

Defense Mechanisms

• Repression

• Denial

• Projection

• Displacement

• Regression

• Rationalization

Humanistic Theories

• Carl Rogers: Unconditional Positive Regard

• Maslow: Self-Actualization

Trait Theory: The Big Five (OCEAN)

• Openness

• Conscientiousness

• Extraversion

• Agreeableness

• Neuroticism

Psychological Disorders

Anxiety Disorders

• Generalized Anxiety Disorder (GAD)

• Panic Disorder

• Phobias

• Obsessive-Compulsive Disorder (OCD)

• Post-Traumatic Stress Disorder (PTSD)

Mood Disorders

• Major Depression

• Bipolar Disorder

Schizophrenia

• Hallucinations

• Delusions

• Disorganized thinking

Treatment

Psychotherapy

• Talk therapy

• Cognitive Behavioral Therapy (CBT): Changes unhealthy thoughts and behaviors.

• Humanistic Therapy: Client-centered approach.

• Psychodynamic Therapy: Explores unconscious conflicts.

Biomedical Treatments

• Antidepressants

• Antianxiety medications

• Antipsychotics

• Mood Stabilizers

Social Psychology

Key Concepts

• Conformity: Changing behavior to fit a group.

• Obedience: Following authority.

• Groupthink: Poor decisions due to group pressure.

• Social Facilitation: Performing better around others.

• Bystander Effect: Less likely to help when others are present.

• Attribution: Explaining behavior.

• Fundamental Attribution Error: Overestimating personality while underestimating the situation.

Important Researchers