Comprehensive Introduction to University Psychology and Research Methodology

General Psychology Sub-disciplines and Definition

• Definition: Psychology is the scientific study of human experience and behavior. The word originates from the Greek terms "psyche" ($\text{soul, mind}$) and "logos" ($\text{science, customer}$), literally translating to "knowledge of the soul."

• Basic Subjects:

  • Biological Psychology: Focuses on physical processes in the body, primarily the nervous system ($Chapter\,4$).

  • General Psychology: Investigates processes common to all humans, such as perception, thinking, learning, memory, language, emotion, and motivation ($Chapter\,5$).

  • Developmental Psychology: Studies changes in psychological processes throughout the entire lifespan ($Chapter\,6$).

  • Social Psychology: Examines the interaction between individuals and social influences ($Chapter\,7$).

  • Differential and Personality Psychology: Focuses on differences between individuals and within individuals across time ($Chapter\,8$).

• Applied Subjects:

  • Pedagogical Psychology: Education and educational processes.

  • AOW Psychology: Work, Organization, and Economics (Market research, personnel selection).

  • Clinical Psychology: Mental disorders, prevention, and rehabilitation.

  • Health Psychology: Health-promoting measures (stress, nutrition, smoking).

  • Psychological Diagnostics: Skills used across fields to make evidence-based decisions (e.g., testing for dyslexia or career suitability).

Major Psychological Approaches

• Psychodynamic Approach: Behavior is driven by strong internal forces (drives). Founded by Sigmund Freud; emphasizes unconscious processes and the conflict between personal needs and social requirements.

• Behaviorist Approach: Behavior is explained by observable stimuli and responses. Founded by John Watson; ignores mental processes that cannot be directly observed.

• Humanistic Approach: Evolved around $1950$ as an alternative. Views humans as active beings striving for positive development and self-actualization. Major figures: Carl Rogers and Abraham Maslow.

• Cognitive Approach: Focuses on mental processes like attention, perception, and memory. Views humans as information-processing systems. Dominant approach since the "Cognitive Turn."

• Biological-Neuroscientific Approach: Traces psychological phenomena back to biochemical processes ($\text{genes, nervous system, hormones}$).

Goals of Psychology and Ethical Principles

• Psychological Goals:

  1. Describe: Systematically record information (data) objectively.

  2. Explain: Recognize patterns and develop theories based on dispositional ($\text{internal stability}$) and situative ($\text{environment}$) factors.

  3. Predict: Make statements about the probability of future behavior.

  4. Change: Intervention for well-being; requires a "treatment mandate" for ethical validity.

• APA Ethical Principles ($2017$):

  • Beneficence and Non-Harm: Minimize damage to humans and animals.

  • Loyalty and Responsibility: Adhere to professional standards.

  • Integrity: Honesty and truthfulness (rejects fraud/deception).

  • Justice: Ensure all benefit equally from psychological findings.

  • Respect for Rights and Dignity: Privacy, confidentiality, and self-determination.

History of Psychology: Philosophical Roots and Early Schools

• Ebbinghaus Quote: "Psychology has a long past, but only a short history."

• Ancient Conceptions of the Soul:

  • Orphics ($600\,BC$): Dualism; Body as the prison of the immortal soul. Soul cycles through life and death.

  • Plato ($427-347\,BC$): Soul consists of three parts: Appetite ($\text{abdomen}$), Determination ($\text{chest}$), and Reason ($\text{head}$).

  • Aristotle ($384-322\,BC$): Soul and Body are inseparable. Three types of soul: Vegetative ($\text{plants}$), Animal ($\text{senses/movement}$), and Thinking ($\text{humans/logic}$).

• The Four Humors (Galen/Hippocrates):

  • Sanguine: Blood; joyful and excitable.

  • Phlegmatic: Phlegm; slow and weak but friendly.

  • Choleric: Yellow bile; quick to anger and temperamental.

  • Melancholic: Black bile; sad and gloomy.

• Rationalism vs. Empiricism:

  • Descartes (Rationalism): $cogito\,ergo\,sum$ ("I think, therefore I am"). Interaction via the pineal gland. Mechanistic view of the body.

  • Locke (Empiricism): Mind is a $tabula\,rasa$ (blank slate) at birth. Sensation and Reflection are the sources of knowledge.

• Early Scientific Psychology:

  • Johann Friedrich Herbart: Mathematized psychology; treated ideas as forces.

  • Hermann von Helmholtz: Measured nerve conduction speed; studied physiological optics.

  • Gustav Theodor Fechner: Founded Psychophysics; studied the relationship between physical stimulus and subjective sensation.

  • Wilhelm Wundt: Established the first laboratory for experimental psychology in Leipzig ($1879$). Developed introspection.

Psychological Research Methods

• Science vs. Common Sense: Avoiding cognitive biases like the Hindsight Bias (believing one predicted the outcome) and Confirmation Bias (noticing only info that supports existing beliefs).

• The Research Process:

  1. Question $\rightarrow$ 2. Theory/Hypothesis $\rightarrow$ 3. Operationalization $\rightarrow$ 4. Execution $\rightarrow$ 5. Analysis $\rightarrow$ 6. Interpretation $\rightarrow$ 7. Publication.

• Scientific Standards: Formulation of a research problem, realization of the process, ethical orientation, and documentation (replicability).

• Variables and Scales:

  • Nominal: Categories (gender, nationality).

  • Ordinal: Ranks (school grades).

  • Interval: Fixed distances, no natural zero ($\text{Celsius}$).

  • Ratio: Fixed distances with natural zero ($\text{Kelvin, reaction time}$).

• Descriptive Statistics:

  • Mean ($M$): $\frac{\sum x_i}{N}$.

  • Median: Middle value in sorted data.

  • Variance ($Var$): $\frac{\sum (x_i - M)^2}{N}$.

  • Standard Deviation ($SD$): $\sqrt{Var}$.

  • Correlation Coefficient ($r$): Measures linear relationship ($-1$ to $1$).

Biological Psychology: Neurons and the Nervous System

• Neuron Types: Sensory (to ZNS), Interneurons (integration), Motoneurons (to muscles).

• Neuronal Communication:

  • Resting Potential: Approximately $-70\,mV$; maintained by $\text{Na+ / K+}$ pump.

  • Action Potential: Threshold is $-55\,mV$; rise to peak of $+50\,mV$ due to $Na+$ influx ($\text{depolarization}$). Followed by $K+$ efflux ($\text{repolarization}$).

  • Synapse: Chemical transmission via neurotransmitters (Glutamate [excitatory], GABA [inhibitory], Dopamine [reward], Serotonin [mood]).

• Brain Structure:

  • Medulla Oblongata: Life-sustaining functions (breathing, heart rate).

  • Cerebellum: Motor coordination.

  • Balken (Corpus Callosum): Connects the two hemispheres.

  • Lobes: Frontal (planning/personality), Parietal (senses/space), Temporal (hearing/memory), Occipital (sight).

• Visual System: Light hits the Cornea $\rightarrow$ Lens $\rightarrow$ Retina. Rods ($\text{brightness/night}$), Cones ($\text{color/day}$). Fovea is the center of sharpest vision. Signal path: Optic nerve $\rightarrow$ Chiasma Opticum $\rightarrow$ CGL $\rightarrow$ V1.

General Psychology: Perception and Learning

• Signal Detection Theory: Separation of sensitivity and response bias (Hits, Misses, False Alarms, Correct Rejections).

• Attention: Exogenous (external pull) vs. Endogenous (internal goal-directed). Inattentional Blindness (e.g., Gorillas in counting tasks).

• Classical Conditioning (Pavlov): $UCS \rightarrow UCR$. Pair $UCS$ with $Neutral\,Stimulus$. Result: $CS \rightarrow CR$.

• Operant Conditioning:

  • Law of Effect (Thorndike): Behavior with satisfying consequences is repeated.

  • Skinner Box: Positive/Negative Reinforcement (increases behavior) and Positive/Negative Punishment (decreases behavior).

• Observational Learning (Bandura): Bobo-Doll study; children imitate models, influenced by reinforcement given to the model.

Memory Systems

• Multi-Store Model (Atkinson & Shiffrin): Sensory Memory ($\text{iconic/echoic}$) $\rightarrow$ Short-term Memory ($\text{limited capacity}$) $\rightarrow$ Long-term Memory.

• Working Memory (Baddeley): Phonological Loop, Visuo-spatial Sketchpad, Central Executive, and Episodic Buffer.

• Long-term Memory Channels:

  • Explicit (Declarative): Semantic (facts) and Episodic (events).

  • Implicit (Non-declarative): Procedural (skills), Conditioning, Priming.

• Memory Effects:

  • Serial Position Effect: Primacy effect (early items) and Recency effect (late items) are remembered best.

  • Ebbinghaus Forgetting Curve: Massive loss in the first hour, then slow decline.

Developmental Psychology

• Prenatal Development: Germinal (0-2 weeks), Embryonic (3-8 weeks - organogenesis), Fetal (9 weeks - birth - growth). Sensitivity to Teratogens (alcohol, drugs).

• Piaget's Stages:

  1. Sensumotoric ($0-2\,y$): Object permanence.

  2. Pre-operational ($2-7\,y$): Realism/Animism.

  3. Concrete Operational ($7-11\,y$): Conservation/Logic.

  4. Formal Operational ($11+ \,y$): Abstract thinking.

• Kohlberg's Morality:

  • Pre-conventional: Punishment/Reward.

  • Conventional: Social norms/Laws.

  • Post-conventional: Universal ethics.

• Attachment Theory (Ainsworth): Avoidant ($A$), Secure ($B$), Ambivalent ($C$), Desorganized ($D$). Tested via the "Strange Situation" test.

Social Psychology

• Social Influence: Informational ($\text{crisis/expert}$) vs. Normative ($\text{acceptance}$). Asch's Line Study (Conformity).

• Milgram Experiment: $65\%$ of subjects administered lethal shocks of $450\,V$ due to obedience to authority.

• Groups: Minimal Group Paradigm (Tajfel) shows ingroup favoritism even with arbitrary categorization. Ingroup vs. Outgroup.

• Pro-social Behavior: Explained by Kin Selection ($\text{evolution}$), Social Exchange Theory ($\text{Cost-Benefit}$), and Empathy-Altruism Hypothesis.

• Bystander Effect: Responsibility diffusion and pluralistic ignorance lead to less help as the number of witnesses increases.

Differential Psychology: Personality and Assessment

• Big Five (OCEAN): Openness, Conscientiousness, Extraversion, Agreeableness, Neuroticism ($standardized\,on\,NEO-PI-R$).

• Psychodynamics: Ego, Id ($\text{Lust principle}$), Superego ($\text{Moral level}$).

• Humanism: Maslow's Hierarchy of Needs ending in Self-Actualization.

• Locus of Control (Rotter): Internal (I control life) vs. External (life is luck/others).

• Diagnostics: L-Data (Life records), Q-Data (Questionnaires), T-Data (Tests). IAT measures implicit bias via reaction times. Projective tests like Rorschach (inkblots) are of low diagnostic value today compared to objective tests.