Difficulty: Introductory to Intermediate | Prerequisites: Basic understanding of perception (see Perception study notes)
This topic brings together three areas that share a common thread: the ways the brain takes shortcuts. Classical conditioning is a shortcut in learning (associating one stimulus with another). Heuristics are shortcuts in thinking (defaulting to the familiar). And the repressed-memory debate asks whether the brain's shortcut of burying traumatic material is real or reconstructed. Understanding these together gives you a stronger grip on how automatic, unconscious processes shape behaviour.
Classical conditioning is learning by association: a neutral stimulus gets paired with one that naturally triggers a response, until the neutral stimulus alone produces that response. The repressed-memory debate asks whether traumatic memories can be genuinely pushed into the unconscious and later recovered, or whether such "recovered" memories are reconstructions. The familiarity heuristic and mental set show how the brain defaults to what it already knows, which speeds up decision-making but introduces systematic errors.
Classical conditioning
A learning process in which a neutral stimulus becomes associated with a stimulus that naturally produces a response, so that the neutral stimulus eventually triggers that response on its own. Think of it as learning by pairing: hear a bell enough times before food arrives, and the bell alone makes you salivate.
Unconditioned stimulus (UCS)
A stimulus that naturally and automatically triggers a response without any prior learning. In Lauren's example, the coffee and doughnut are the UCS because they naturally cause her stomach to respond.
Unconditioned response (UCR)
The natural, unlearned reaction to the unconditioned stimulus. Lauren's stomach growling at the sight and smell of food is the UCR.
Conditioned stimulus (CS)
A previously neutral stimulus that, after being paired with the UCS, comes to trigger a response on its own. The doorbell becomes the CS for Lauren: it was neutral until it was repeatedly paired with the arrival of coffee.
Conditioned response (CR)
The learned response to the conditioned stimulus. Lauren's stomach growling when the doorbell rings (even when no coffee is coming) is the CR.
Extinction (in conditioning)
The gradual weakening and eventual disappearance of a conditioned response when the conditioned stimulus is repeatedly presented without the unconditioned stimulus. In simple terms, if the doorbell keeps ringing but no coffee ever arrives, the stomach eventually stops growling at the sound.
Repressed memory
A controversial concept referring to memories of traumatic events that are supposedly pushed into the unconscious mind and later recovered. The debate centres on whether these are genuine memories that were hidden or false memories constructed during the recovery process.
Familiarity heuristic
A mental shortcut in which familiar items, ideas, or people are judged as superior to unfamiliar ones, simply because they are recognised. Think of it as the brain defaulting to "I know this, so it must be better."
Mental set
The tendency to approach a problem using strategies that have worked in the past, even when those strategies are no longer appropriate. In simple terms, you get stuck in a groove of thinking and fail to consider alternatives.
Neuropsychology
The study of how biological structures and functions of the brain and nervous system affect behaviour. It sits at the intersection of neuroscience and clinical psychology.
Ivan Pavlov (1927) discovered classical conditioning while studying digestion in dogs. He observed that dogs began salivating not just when food was presented, but at the sight of the experimenter or the sound of footsteps, before any food appeared.
The key mechanism: two stimuli are repeatedly paired until the neutral one alone triggers the response.
UCS (food) naturally produces UCR (salivation)
A neutral stimulus (bell/footsteps) is paired with the UCS
After repeated pairings, the neutral stimulus becomes the CS and produces the CR (salivation without food)
Lauren's doorbell example maps the same way:
UCS: coffee and doughnut
UCR: stomach growling at the food
CS: the doorbell (originally neutral, now associated with coffee arriving)
CR: stomach growling at the doorbell, even on non-Monday mornings
To "unlearn" a conditioned response, the CS must be presented repeatedly without the UCS. This is extinction. For Lauren, this would mean hearing the doorbell many times without coffee following. Gradual reduction of the substance can also help.
Neuropsychology has become essential to the study of mental disorders, helping psychologists understand how the nervous system controls behaviour.
At a fundamental level, humans are biological beings. Research in neuroscience draws on diverse fields including computer science and zoology (Beatty, 2000; Posner and DiGirolamo, 2000; Gazzaniga, Ivry, and Mangun, 2002; Cartwright, 2006).
The lecture references a case study of misdiagnosed children whose illness was eventually identified as an autoimmune disease (confirmed 2007) in which the immune system attacks the brain. This illustrates how biological processes can produce psychiatric symptoms and how initial neurological assessments can be wrong.
Psychoanalytic theory holds that traumatic memories can be pushed into the unconscious (repressed) and later recovered.
The debate: are recovered memories genuine recollections of real events, or are they false memories constructed during therapy or under suggestion?
Emotional influences on memory are well established: strong emotions can enhance some aspects of a memory while distorting others.
The unconscious does influence behaviour (a core psychoanalytic claim), but the mechanism by which it does so, and whether full memories can be stored and retrieved intact from the unconscious, remains contested.
The familiarity heuristic leads people to judge familiar options as better or more trustworthy than unfamiliar ones, simply because they recognise them.
Mental set locks people into previously successful problem-solving strategies, even when those strategies no longer fit the current problem.
Together, these produce errors in social conflict resolution: people default to familiar approaches and favour people or ideas they already know, which can prevent them from seeing new solutions or fairly evaluating unfamiliar perspectives.
Reducing these errors requires deliberate effort: actively seeking out unfamiliar viewpoints, questioning why a familiar solution feels "right," and using structured decision-making frameworks that force consideration of alternatives.
Classical conditioning is the basis of much advertising: a product (neutral stimulus) is paired with something that naturally produces a positive emotional response (attractive imagery, music, humour) until the product alone triggers positive feelings. It is also used therapeutically: systematic desensitisation treats phobias by gradually pairing the feared stimulus with relaxation, weakening the conditioned fear response through extinction.
The familiarity heuristic explains brand loyalty, hiring bias (favouring candidates who resemble existing employees), and resistance to organisational change. Awareness of this bias is the first step toward countering it in professional decision-making.
Students often confuse classical conditioning with operant conditioning. Classical conditioning involves involuntary, automatic responses (salivation, stomach growling). Operant conditioning involves voluntary behaviours shaped by consequences (rewards and punishments).
A common error is thinking extinction means the conditioned response is permanently erased. It is suppressed, not deleted. Spontaneous recovery (the CR returning after a rest period) can occur.
Students sometimes assume repressed memories are either entirely real or entirely fabricated. The evidence is more nuanced: emotional trauma does affect memory, but the specific mechanism of repression and later intact recovery is not well supported.
The familiarity heuristic is often confused with mere exposure effect. They are related but distinct: mere exposure increases liking through repeated contact, while the familiarity heuristic specifically biases judgement of quality or superiority toward recognised items.
Be able to identify UCS, UCR, CS, and CR in a given scenario. The Lauren example is a strong candidate for an exam question.
Know Pavlov's original experiment and be able to describe it in your own words.
Understand extinction and how to "unlearn" a conditioned response. Expect a question asking what you would recommend to reverse a conditioned behaviour.
The repressed-memory debate is a common essay question. Be prepared to argue both sides and cite the role of emotional influences on memory.
Know what the familiarity heuristic is and how mental set compounds its effects in social conflict. Be ready to give a specific example of each.
Fill in the blank: In Lauren's example, the doorbell is the ______ stimulus. (Conditioned.)
True or false: Extinction permanently erases a conditioned response. (False. The response is suppressed and can spontaneously recover.)
Fill in the blank: The ______ heuristic causes people to judge familiar items as superior to unfamiliar ones. (Familiarity.)
True or false: All psychologists agree that repressed memories are genuine recollections of real events. (False. This remains a significant debate in the field.)
Fill in the blank: Pavlov discovered classical conditioning while studying ______ in dogs. (Digestion / salivation.)
Q: Lauren's stomach growls every time the doorbell rings, even when it is not Monday. Identify the type of learning and label the UCS, UCR, CS, and CR.
A: This is classical conditioning. The UCS is the coffee and doughnut (which naturally trigger hunger). The UCR is the stomach growling in response to the food. The CS is the doorbell, which was originally neutral but became associated with the arrival of food through repeated pairing. The CR is the stomach growling in response to the doorbell alone.
Q: What would you recommend to help Lauren "unlearn" her conditioned response?
A: The most effective approach is extinction: presenting the CS (doorbell) repeatedly without the UCS (coffee). Over time, the association weakens and the CR diminishes. Gradually reducing coffee intake can also help break the physiological dependence component.
Q: Do you believe repressed memories are real or unreal? Support your reasoning.
A: The evidence supports a nuanced position. Emotional trauma does affect memory encoding and retrieval, and the unconscious does influence behaviour. However, the specific claim that complete memories can be pushed into the unconscious and later recovered intact is not well supported by controlled research. "Recovered" memories may in some cases be reconstructions influenced by therapeutic suggestion. A strong exam answer acknowledges both the psychoanalytic view and the empirical criticisms.
Q: How can the familiarity heuristic and mental set together lead to errors in resolving social conflicts?
A: The familiarity heuristic causes people to favour familiar solutions and familiar people over unfamiliar alternatives, even when the unfamiliar option may be better. Mental set locks them into problem-solving strategies that worked before, preventing creative or context-appropriate responses. Together, these biases mean a person may keep applying the same approach to a conflict and keep favouring the same allies, missing better resolutions. Deliberate strategies, such as actively seeking unfamiliar perspectives, can reduce these errors.
Classical conditioning links directly to the drug use and addiction material: Lauren's coffee dependence is both a conditioning example and a substance dependence example. It also connects to perception: conditioned associations shape what we expect to perceive, which feeds into the inattentional blindness and expectation bias material from earlier discussions. The familiarity heuristic and mental set connect to broader cognitive psychology and decision-making, topics that recur throughout the course. Neuropsychology underpins all of it, providing the biological substrate for learning, memory, and perception.
Classical conditioning, Pavlov, conditioned stimulus, unconditioned stimulus, conditioned response, unconditioned response, extinction, spontaneous recovery, learning by association, repressed memory, recovered memory, false memory, psychoanalytic theory, unconscious, familiarity heuristic, mental set, cognitive bias, social conflict, neuropsychology, neuroscience, biological bases of behaviour, Becklen and Cervone, Barrett and Wager, systematic desensitisation, mere exposure effect, PSY II, Psychology II, FIU