Cognitive Psychology - Introduction and History of Cognitive Psychology

Professional Etiquette, Demographics, and Ethics in Cognitive Science

• Guidelines for Professional Conduct:

  • Unlearn internalized systemic biases including ableism, classism, racism, misogyny, transphobia, anti-fat attitudes, addiction stigma, and religious bigotry.

  • Practice using inclusive language, correctly pronounce individuals' names, and respect personal pronouns.

• Demographic Realities and Systemic Disparities:

  • According to $2021$ census data for England and Wales, $82.0\%$ of the population is White.

  • Non-White populations represent the global majority, making up $85\%$ to $92\%$ of the world's population (only $8\%$ to $15\%$ of the global population is White).

  • Systemic barriers contribute to an attainment gap in higher education, resulting in the underrepresentation of non-White students.

  • Transgender and Intersex Demographics: $0.5\%$ of the population identifies as transgender (almost half experience regular hate crimes or incidents), and $1.7\%$ of individuals are born intersex.

  • LGBT+ Demographics: Over $10\%$ of young people in the United Kingdom identify as LGBT+.

  • Eating and Exercise Disorders: Up to $60\%$ of individuals under age $25$ experience eating or exercise issues, affecting $78\%$ of young women and $43\%$ of young men.

  • Disability: $23\%$ of the working-age population in Britain lives with a disability.

  • Mental Health Statistics:

  • Suicidal ideation is widespread across populations; men are $3\times$ to $4\times$ more likely to die by suicide than other demographic groups.

  • A $2009$ American Psychological Association (APA) survey revealed that $87\%$ of psychology graduate students reported experiencing anxiety, and $68\%$ reported symptoms of depression.

  • Among clinical psychologists, $62.7\%$ report having experienced a mental health condition during their lifetime.

• Accountability and Harm Reduction:

  • Acknowledge that exposure to systemic bias affects everyone; focus on reflection and corrective action rather than defensiveness.

  • Prioritize the real impact and harm caused to others over personal intentions or feelings.

  • Stand up against injustice, refrain from tolerating harassment, share learning resources, and seek trusted academic support early when struggling.

Course Structure, Assessment Criteria, and Pedagogical Methods

• Curriculum Objectives:

  • Develop a foundational understanding of the human mind, brain, cognitive mechanisms, and cognitive neuroscience.

  • Transition from high school rote learning to university-level critical engagement with primary research literature.

  • Prioritize deep conceptual comprehension over superficial memorization:     $\text{Conceptual Comprehension} \gg \text{Fact Memorization}$

• Module Organization:

  • Main Lectures: Cover foundational concepts with mandatory live attendance ($\ge 50\%$ requirement) and dedicated Q&A sessions.

  • Method Lectures: Combine interactive methodological instruction with independent evaluation of primary research papers and informal peer discussion seminars.

  • Virtual Learning Environment (Canvas): Houses weekly essential reading assignments, supplementary papers, video resources, and software tools.

• Assessment Framework:

  • Evaluated via $90$ Multiple Choice Questions (MCQs) covering material from lectures, toolkits, and essential readings.

  • Designed to test deep conceptual integration and understanding across overlapping resources.

  • Graded on a Pass/Fail scheme focused on constructing core competency for advanced modules.

• Active Learning and Smart Reading Protocol:

  • Avoid passive word-by-word reading of scientific literature.

  • Step 1: Formulate specific inquiry questions before reading a text.

  • Step 2: Skim section headers and technical keywords to identify unfamiliar topics.

  • Step 3: Review chapter summaries to locate conceptual gaps.

  • Step 4: Complete end-of-chapter exercises and explain key terms aloud to verify comprehension.

  • Step 5: Utilize specialized academic software, such as reference management tools (e.g., Mendeley) and structured document formatting templates.

Foundations of Cognitive Psychology and the Mind

• Functional Definition of the Mind:

  • The mind is the control system responsible for creating and executing cognitive operations, including perception, attention, memory, emotion, language, decision-making, thinking, planning, and reasoning.

  • The mind functions as a goal-directed system that constructs internal representations of the physical world to guide action.

  • Theoretical framework: The mind operates as a prediction machine, simulation engine, or internal "proxy" representing external reality.

• Dual Levels of Cognitive Processing:

  • High-Level Processing (Top-Down): Consciously controlled, deliberative, and goal-driven cognitive operations.

  • Low-Level Processing (Bottom-Up): Automatic, stimulus-driven, and subconscious processing streams.

• The Core Methodological Problem in Cognitive Science:

  • The mind cannot be observed directly in any biological or psychological context.

  • Empirical investigation relies exclusively on measuring observable behavior and making valid scientific inferences regarding hidden cognitive processes and internal mechanisms.

Epistemological Roots: Rationalism vs. Empiricism

• Prior to the 19th century, investigation into mental phenomena belonged entirely to philosophy.

• Rationalism (e.g., Plato, René Descartes):

  • Asserts that reason is the fundamental source and arbiter of knowledge.

  • Holds that physical and abstract reality possesses an intrinsically logical structure accessible directly via intellect.

  • Proposes the existence of fundamental a priori truths (such as mathematics, formal logic, and metaphysics) that cannot be denied without logical contradiction.

• Empiricism (e.g., Aristotle, John Locke):

  • Asserts that all knowledge and concepts originate directly from sensory experience.

  • Core philosophical doctrine:     $\text{Intellect}_{\text{contents}} = \text{Sensory Experience}$     (Nothing exists in the intellect that was not first present in the senses, except the intellect itself).

  • Rejects pure rational deduction unless grounded in observable physical phenomena.

Early Experimental Psychology (Late 19th Century)

• Franciscus Donders ($1868$) and the Subtraction Method:

  • Conducted the first recorded cognitive psychology experiment to quantify the duration of mental processing.

  • Subtraction Method Logic: Comparing two tasks that differ by exactly one mental process allows the duration of that isolated process to be calculated.

  • Experimental Setup:

  • Simple Reaction Time ($t_1$): Participant presses a button immediately upon perceiving a single light stimulus.

  • Choice Reaction Time ($t_2$): Participant must decide whether the light appeared on the left or right side and press the corresponding button.

  • Mathematical Formulation:     $t_{\text{decision}} = t_2 - t_1$     $t_{\text{decision}} = \text{Mean}(t_2) - \text{Mean}(t_1)$

  • Established that mental operations are measurable and take a quantifiable amount of time.

• Wilhelm Wundt ($1879$) and Structuralism:   

  

  • Established the first experimental psychology laboratory in $1879$ at the University of Leipzig.

  • Framework of Structuralism: Attempted to explain conscious experience by decomposing it into its basic elementary components, termed sensations.

  • Method of Analytical Introspection: Trained participants described their conscious experiences in response to controlled sensory stimuli.

  • Applied psychophysical instruments including tachistoscopes, chronoscopes, pendulums, and electrical timing apparatuses.

  • Theoretical Goal: Construct a "periodic table of the mind" categorizing all basic sensations and the laws governing their combination.

  • Major Limitation: Method was restricted exclusively to conscious, verbalizable thought processes.

• Hermann Ebbinghaus ($1885$) and Quantitative Memory Measurement:   

  

  • Developed objective, quantitative methods to study memory retention and forgetting, avoiding subjective introspection.

  • Methodology: Memorized lists of non-meaningful, non-integrated nonsense syllables (e.g., three-letter combinations like DAX or QEH) to eliminate prior associations.

  • Relearning / Savings Score: Measured the reduction in time or repetitions required to relearn a list after a retention interval ($t_{\text{interval}}$ ranging from hours to weeks).

  • The Forgetting Curve: Discovered that memory decay occurs rapidly within the first $24\,\text{hours}$ post-learning, after which the rate of loss plateaus.

• William James ($1890$) and Functionalism:   

  

  • Authored Principles of Psychology ($1890$), the foundational textbook in modern psychology.

  • Framework of Functionalism: Shifted focus from structural decomposition to understanding the functional purpose and biological adaptive value of mental processes.

  • Emphasized direct observation of mind and behavior in real-world environments over artificial laboratory introspection.

The Behaviorist Movement and the Rejection of Introspection

• John B. Watson and Behaviorism ($1913$):

  • Critiqued analytical introspection for producing highly variable, subjective results that could not be independently verified or replicated.

  • Published the Behaviorist Manifesto ($1913$), redefining psychology as a purely objective, experimental branch of natural science.

  • Primary Objective: The prediction and control of observable behavior:     $\text{Psychology Goal} = \text{Prediction} + \text{Control of Behavior}$

  • Explicitly eliminated concepts of consciousness, mind, and mental representations from scientific study.

  • Reduced psychological inquiry to external environmental inputs and measurable outputs (the Stimulus-Response / $S \rightarrow R$ framework).   

    

• Ivan Pavlov ($1927$) and Classical Conditioning:   

  

  • Demonstrated environmental control of physiological reflexes in dogs.

  • Conditioning Sequence:

  • Before Conditioning: Unconditioned Stimulus ($US$, food) triggers Unconditioned Response ($UR$, salivation). Neutral Stimulus ($NS$, bell) produces no salivation.

  • During Conditioning: $NS$ (bell) is repeatedly paired with $US$ (food), evoking $UR$ (salivation).

  • After Conditioning: $NS$ becomes Conditioned Stimulus ($CS$, bell), evoking Conditioned Response ($CR$, salivation) independently.

• B.F. Skinner ($1938$) and Operant Conditioning:

  • Became the dominant paradigm in psychology from the $1930\text{s}$ through the $1950\text{s}$.

  • Formulated the principle that behavior is shaped and maintained by its consequences:

  • Reinforcement (Positive/Negative): Increases the probability of a response.

  • Punishment: Decreases the probability of a response.

  • Applied operant mechanics to habit formation, clinical behavioral therapy, and learning theory.

• Ethical Consequences of Behaviorist Dogma:

  • Rejecting internal emotional states and mental processes led to viewing research subjects purely as physical reactive systems.

  • Fostered ethically objectionable research practices, including fear-conditioning infants (e.g., the Little Albert experiment), extreme animal deprivation, and involuntary electroshock conditioning.

  • Historically fueled by military funding and applications during World War I and World War II.

The Cognitive Revolution and Re-emergence of Mental Processing

• Early Challenges to Behaviorism:

  • Edward Tolman ($1948$) - Cognitive Maps:     

    

  • Placed rats in a maze to locate a food box. When the main path was blocked, rats automatically navigated alternative turns based on an internal spatial representation (a cognitive map) rather than relying on conditioned motor habit chains.

  • Colin Cherry ($1953$) - Selective Attention:

  • Demonstrated that individuals filtering auditory information during dichotic listening tasks select input based on internal processing mechanisms.

• The Skinner-Chomsky Debate ($1957 - 1959$):

  • B.F. Skinner published Verbal Behavior ($1957$), proposing that language acquisition occurs entirely through operant conditioning (imitation, association, and reinforcement).

  • Noam Chomsky published a critical review ($1959$), demonstrating that operant conditioning cannot account for language:

  • Children regularly produce novel expressions they have never heard or been reinforced for (e.g., "I hate you, Mum").

  • Children pass through stages of systemic overregularization grammar errors despite receiving no reinforcement for incorrect syntax.

  • Conclusion: Language is governed by an innate biological mental framework (Universal Grammar).

• Paradigmatic Shift:

  • Psychologists realized that fully explaining complex behavior requires investigating internal cognitive operations inferred from observable performance.

Information Processing Models and Cognitive Paradigms

• The Information Processing Paradigm:

  • Developed during the $1950\text{s}$ alongside digital computer architecture (e.g., the DSIR ACE Pilot Model in $1950$).

  • Views cognitive activity as a series of distinct computational stages processing mental representations.

  • Standard Flow Structure:     $\text{Perception} \longrightarrow \text{Attention} \rightleftharpoons \text{Memory Unit} \longrightarrow \text{Decision} \longrightarrow \text{Action Planning} \longrightarrow \text{Motor Response}$

• Core Pillars of Cognitive Information Processing:

  1. Mental Representations: Internal symbolic structures encoding external reality (e.g., the concept of a "car" containing multi-modal visual, motor, tactile, and emotional feature dimensions).

  2. Transformations of Representations: Dynamic operations that recode, retrieve, and manipulate internal structures depending on contextual goal requirements.

• Development of Artificial Intelligence:

  • Allen Newell and Herbert Simon ($1955$) created the Logic Theorist, the first artificial intelligence program.

  • Utilized human-like heuristic search and logical reasoning to prove complex mathematical theorems, establishing that machines could execute cognitive problem-solving.

• Cognitive Capacity Limits and Working Memory:

  • George Miller ($1956$) identified strict processing limitations in human working memory, bounded by:     $\text{Memory Capacity} = 7 \pm 2 \text{ units (bits)}$

  • Recoding / Chunking Mechanism: To navigate capacity constraints, human cognition actively recodes primitive sensory bits into larger, abstract conceptual chunks.

  • Concept of Working Memory operating as a Central Processing Unit (CPU).

• Structural Comparison: Brain vs. Computer:

  • Functional Utility: The computer metaphor provides a framework for breaking down complex mental operations into modular subprocesses.

  • Fundamental Disconnect:

  • Digital computers process information via serial, binary logic circuits.

  • Biological brains operate via massive, non-linear, parallel neural networks working on fundamentally different physical and biochemical principles.