Definition of Psychology

  • Psychology: The study of behavior and mental processes.

Historical Development of Psychology

  • Traced back to the philosophy of Empiricism emphasizing sensory perception and evidence in forming ideas.
  • Key philosophers: Socrates, Plato, Aristotle, Francis Bacon, Rene Descartes, and John Locke.
  • Major psychological movements:
    • Structuralism (Wilhelm Wundt & Edward Titchener): Study consciousness through introspection.
    • Functionalism (William James): How structures function in life, influenced by Darwin's evolution theory.
    • Psychoanalysis (Freud): Role of the unconscious in behavior.
    • Behaviorism (Watson, Pavlov, Skinner): Focus on observable behavior.
    • Gestalt Psychology: Focus on perception and understanding of the whole.

Approaches to Studying Behavior and Mental Processes

  • Biological: Examines physiological bases.
  • Evolutionary: Sheds light on adaptive fitness.
  • Psychoanalytic: Focuses on unconscious influences.
  • Behavioral: Observes learned behaviors.
  • Cognitive: Examines mental processes.
  • Humanistic: Emphasizes individual potential (Maslow, Rogers).
  • Social: Culture's impact on behavior (Bandura).

Subfields in Psychology

  • Cognitive, biological, personality, developmental, quantitative, clinical, counseling, psychiatry, community, educational, school, social, and industrial.

Methods and Testing

  • Research Types:
    • Applied Research: Practical applications; compares methods.
    • Basic Research: Fundamental questions, no immediate application.
  • Validity Types:
    • Face Validity: Surface-level accuracy.
    • Content Validity: Completeness of measure.
    • Criterion-Related Validity:
    • Concurrent Validity: Measure of present status.
    • Predictive Validity: Measure of future performance.
    • Construct Validity: Correlation with existing measures.
  • Reliability Types:
    • Split-Half Reliability: Test divided into two for performance correlation.
    • Equivalent-Forms Reliability: Correlation between different test forms.
    • Test-Retest Reliability: Repeat test to correlate scores.
  • Importance of operational definitions for replicability.

Research Designs

  • Laboratory Experiments: Controlled environment.
  • Field Experiments: Natural setting.
  • Other methods: naturalistic observation, surveys, case studies, and standardized testing (e.g., SAT).
  • Study Types: Longitudinal vs. cross-sectional.

Variables in Experiments

  • Independent vs. Dependent Variables: What changes vs. what is measured.
  • Experimental vs. Control Groups: Varied conditions.
  • Hawthorne Effect: Participants' performance changes due to observation.
  • Counterbalancing: Subjects serve as their own control.

Flaws in Experimental Design

  • Confounding Variables: Extraneous factors influencing results.
  • Random Variables: Random influences.
  • Placebo Effect: Improvement when receiving a placebo.
  • Experimental Bias: Researcher expectations influencing outcomes.
  • Double Blind Design: Both participant and researcher are unaware of group assignments.

Importance of Sampling

  • Samples: Represent larger populations to generalize results.
  • Types:
    • Random Selection: Increases representativeness.
    • Stratified Sampling: Ensures criteria representation.
  • Correlation Coefficient: Relationship strength between variables (-1 to 1).

Descriptive Statistics

  • Used to summarize data:
    • Mean, Median, Mode.
    • Frequency Distribution: Summary table of occurrences.
    • Skewed Distributions: Positive (high outliers) vs. negative (low outliers).
    • Measures of Variability: Range, variance, standard deviation, and z-scores.
  • Statistical Significance: Likelihood that results occurred by chance.

Inferential Statistics

  • Purpose: Apply findings from sample to the population.
  • Sampling Error: Differences between sample and population.

Ethical Responsibilities

  • Animal Research: Must have clear scientific purpose, humane treatment, and legal acquisition.
  • Human Research:
    • Voluntary participation, informed consent, protection from harm, confidentiality, debriefing, and ethics committee review.

Biology and Behavior

  • Neural Messages: Travel from dendrites to axon terminals; myelin sheath aids transmission.
  • Neurotransmitters: Chemicals like dopamine, serotonin used in signaling.
  • Peripheral Nervous System: Somatic (voluntary control) and autonomic (automatic functions) nervous systems.
  • Brain Structure:
    • Cerebral Cortex: Controls cognitive abilities; divided into lobes (frontal, parietal, occipital, temporal).
    • Hindbrain: Basic autonomic functions (medulla, pons, cerebellum).
    • Midbrain: Coordination of movement.
    • Forebrain: Higher functions and emotion regulation.

Brain Imaging Techniques

  • EEG, CAT Scan, MRI/fMRI, PET Scan: Different methods to visualize brain activity.

Brain Flexibility

  • Brain Plasticity: Adaptation after injury.

Hormones

  • Endocrine System: Interconnected with the nervous system, regulates bodily functions through hormone secretion.

Sensation

  • Transduction: Process of converting stimuli into neural impulses.
  • Sensory Structures: Eye (lens, cornea) and ear (cochlea, auditory nerve) anatomy and function.
  • Perception Theories:
    • Top-Down vs. Bottom-Up Processing: Fill in gaps vs. build perception from parts.
    • Gestalt Principles: Understanding whole objects.

Consciousness

  • Stages of Consciousness: Levels from unconscious to conscious processing.
  • Sleep Stages: Various phases including REM.

Learning Theories

  • Classical Conditioning: Pavlov’s dog experiment exemplifying learning through association.
  • Operant Conditioning: Skinner’s reinforcement schedules.

Memory

  • Memory Systems: Sensory, short-term, long-term.
  • Memory Influences: Encoding processes and their importance.

Intelligence

  • IQ Tests: Measurement challenges including validity and reliability.

Motivation and Emotion

  • Theories explaining human behavior (Maslow’s hierarchy, drive-reduction).

Developmental Psychology

  • Stages of development from prenatal to adulthood, incorporating theories (Freud, Erikson, Piaget).

Personality Theories

  • Freud’s Psychodynamic, Trait theories, Behaviorism, Social-Cognitive perspectives.

Abnormal Psychology

  • Psychological disorders and their classification.
  • Treatment methods: behavioral, cognitive, psychoanalytic, humanistic therapies.

Social Psychology

  • Understanding behaviors related to social dynamics, prejudice, and conformity.
  • Factors influencing group behavior, idolizing, and groupthink.