Place these eight landmark events in the history of CBT in the correct chronological order.

Match each first-wave figure to their primary contribution to the foundations of behaviour therapy.

Match each second-wave figure to their primary contribution to the cognitive revolution in therapy.

Ivan Pavlov never worked as a psychotherapist, yet he is considered a founding figure of CBT. Which of the following best explains why his work was so foundational?

A: He developed the first phobia treatment protocol using paired exposure

B: He demonstrated that neutral stimuli can acquire the power to elicit fear responses through repeated pairing with aversive events — providing the mechanistic account of how phobias and conditioned anxiety are acquired

C: He argued that psychological disorders are learned habits, coining the term "behaviour therapy"

D: He used operant conditioning to modify disordered behaviour in psychiatric patients

Correct: He demonstrated that neutral stimuli can acquire the power to elicit fear responses through repeated pairing with aversive events — providing the mechanistic account of how phobias and conditioned anxiety are acquired

Pavlov's work on conditioned reflexes — conducted primarily with dogs in digestive physiology research — provided the basic learning mechanism that behaviour therapists would later argue underlies fear disorders. If a dog could learn to salivate to a bell (a neutral stimulus) through repeated pairing with food, then a person could plausibly learn to fear a dog, a bridge, or a social situation through pairing with aversive experiences. This mechanistic account of fear acquisition was the theoretical cornerstone on which Watson, Jones, Mowrer, and Wolpe all built. The clinical application came from others; the mechanism came from Pavlov.

Edward Thorndike's Law of Effect (1898) is considered a direct conceptual ancestor of operant conditioning and behaviour modification. What does the Law of Effect state?

A: Behaviour is determined by its antecedent stimuli — organisms respond to whatever cues precede their response

B: Of several responses to the same situation, those followed by satisfying consequences are more likely to recur; those followed by discomfort are less likely to recur

C: Repeated exposure to a stimulus without consequence leads to a progressive reduction in response — the habituation effect

D: Emotional responses cannot be modified once acquired through early conditioning

Correct: Of several responses to the same situation, those followed by satisfying consequences are more likely to recur; those followed by discomfort are less likely to recur

Thorndike's Law of Effect, derived from his "puzzle box" experiments with cats, states that the consequences of behaviour determine whether it is repeated. Behaviours followed by satisfying states are "stamped in"; those followed by annoying states are "stamped out." This was the first systematic account of how consequences shape behaviour, directly prefiguring Skinner's reinforcement principles and underpinning the entire clinical field of behaviour modification — token economies, contingency management, and behavioural activation all apply the Law of Effect.

John Watson's 1913 paper "Psychology as the Behaviourist Views It" is called the Behaviourist Manifesto. What was its central claim?

A: Behaviour can only be understood by reference to the unconscious — Watson's goal was to make psychoanalysis more scientifically rigorous

B: Psychology should be the science of observable behaviour, abandoning introspection and consciousness as its subject matter — making it methodologically equivalent to other natural sciences

C: Emotion and cognition are more important than overt behaviour in explaining mental disorders

D: Conditioning experiments with animals cannot be generalised to human psychological problems

Correct: Psychology should be the science of observable behaviour, abandoning introspection and consciousness as its subject matter — making it methodologically equivalent to other natural sciences

Watson argued that the study of consciousness through introspection had rendered psychology unscientific — its data were private and unreplicable. If psychology was to become a genuine science it must limit itself to observable, measurable behaviour. This was a radical methodological and philosophical claim: it redefined the discipline's subject matter entirely. Watson's behaviourism set the agenda for the next four decades of experimental psychology, creating the scientific culture from which behaviour therapy emerged in the 1950s.

Mary Cover Jones is sometimes called the "mother of behaviour therapy." What did she demonstrate in her 1924 study with a child known as Peter?

A: That children's phobias cannot be treated using conditioning principles alone

B: That conditioned fear responses in children are permanent and immune to modification

C: That a conditioned fear (Peter's phobia of rabbits) could be systematically removed through counter-conditioning — gradually pairing the feared stimulus with pleasurable experiences (food) until the fear response was replaced by a positive one

D: That operant reinforcement of courageous behaviour was more effective than counter-conditioning for fear reduction

Correct: That a conditioned fear (Peter's phobia of rabbits) could be systematically removed through counter-conditioning — gradually pairing the feared stimulus with pleasurable experiences (food) until the fear response was replaced by a positive one

Working under Watson's mentorship, Jones tested several methods to treat children's fears and found counter-conditioning most effective. She gradually brought a caged rabbit closer to Peter while he was eating — pairing the feared stimulus with pleasure — until Peter could handle the rabbit without distress. This was the direct therapeutic application of Pavlov's conditioning principles to a clinical problem, and a direct reversal of Watson's Little Albert demonstration. Jones went on to a distinguished research career in child development, and her 1924 paper is now recognised as the first scientific demonstration of behaviour therapy. Wolpe acknowledged her work as a precursor to systematic desensitisation thirty years later.

George W. Humphrey's 1933 work formalised an important learning phenomenon that underpins modern exposure therapy. What is that phenomenon?

A: Operant extinction — the gradual weakening of a behaviour when its reinforcing consequence is removed

B: Habituation — the progressive reduction in responding to a stimulus that is repeated without consequence, as the organism learns it is not significant

C: Sensitisation — the increase in responding to a stimulus after it has been repeatedly paired with an aversive event

D: Spontaneous recovery — the return of an extinguished response after a period of rest

Correct: Habituation — the progressive reduction in responding to a stimulus that is repeated without consequence, as the organism learns it is not significant

Humphrey's 1933 work synthesised the evidence on habituation — the simplest form of learning, in which organisms progressively reduce their response to a stimulus that is presented repeatedly without any meaningful consequence. Habituation provided a theoretical account for one mechanism of exposure therapy: repeated, prolonged contact with a feared stimulus in the absence of actual harm should, over time, lead to a reduction in the conditioned fear response. (More recent models — such as Craske's inhibitory learning model — have complicated this picture, but habituation remains a useful framework for understanding why exposure works.)

O.H. Mowrer's two-factor theory (1939) was a breakthrough in explaining the persistence of anxiety disorders. What are the two factors, and why does the theory matter for clinical practice?

A: Factor 1: Genetic predisposition. Factor 2: Environmental stress. Clinical implication: treatment must address both biology and environment

B: Factor 1: Fear is acquired through classical conditioning — a neutral stimulus paired with an aversive event becomes feared. Factor 2: Avoidance behaviour is acquired and maintained through operant conditioning — escaping from the feared stimulus reduces anxiety, which reinforces the avoidance. Clinical implication: blocking avoidance (exposure) is essential to break the maintenance cycle

C: Factor 1: Cognitive distortions. Factor 2: Safety behaviours. Clinical implication: both must be targeted simultaneously in treatment

D: Factor 1: Classical conditioning acquires fear. Factor 2: Cognitive rumination maintains it. Clinical implication: cognitive restructuring is needed after exposure

Correct: Factor 1: Fear is acquired through classical conditioning — a neutral stimulus paired with an aversive event becomes feared. Factor 2: Avoidance behaviour is acquired and maintained through operant conditioning — escaping from the feared stimulus reduces anxiety, which reinforces the avoidance. Clinical implication: blocking avoidance (exposure) is essential to break the maintenance cycle

Mowrer's two-factor theory elegantly explained why anxiety persists even after the original threat is gone. The first factor — classical conditioning — explains acquisition: a once-neutral stimulus (e.g., a dog) becomes feared through pairing with pain. The second factor — operant conditioning — explains maintenance: every time the person avoids the dog, anxiety drops (negative reinforcement), which powerfully reinforces avoidance. Because avoidance prevents extinction, the fear is preserved indefinitely. This framework is why exposure therapy (blocking avoidance) is the gold-standard psychological treatment for anxiety disorders — it targets the maintenance mechanism directly. Mowrer's model remains the dominant theoretical framework underpinning exposure-based treatments.

Skinner's operant conditioning principles were applied clinically in several ways during the first wave of behaviour therapy. Which application best illustrates their direct use in psychiatric settings?

A: Flooding — exposing patients to feared stimuli at full intensity to accelerate extinction

B: Token economies — structured reinforcement systems in inpatient settings where patients earned tokens (exchangeable for privileges) for targeted behaviours such as personal hygiene, social interaction, or attending activities

C: Systematic desensitisation — pairing feared stimuli with relaxation responses in a graduated hierarchy

D: Cognitive restructuring — identifying and modifying irrational beliefs that maintained disordered behaviour

Correct: Token economies — structured reinforcement systems in inpatient settings where patients earned tokens (exchangeable for privileges) for targeted behaviours such as personal hygiene, social interaction, or attending activities

Token economies, developed in the 1960s (most notably by Ayllon and Azrin), were the direct clinical application of Skinner's operant principles to psychiatric wards. Specific target behaviours were defined; tokens were delivered contingently upon those behaviours; and tokens could be exchanged for reinforcers (privileges, items). The approach produced significant improvements in chronic psychiatric patients' self-care and social behaviour, and demonstrated that even severely disturbed behaviour was sensitive to its consequences. Token economy principles survive today in contingency management programmes for substance use disorders.

True or False: Hans Eysenck is credited with coining the term "behaviour therapy" and using it to describe a scientifically grounded alternative to psychoanalytic treatment.

Answer: True

Eysenck used the term "behaviour therapy" in his 1952 paper and in subsequent work to describe the application of learning theory principles to the treatment of neurotic disorders. He argued that neurotic disorders were maladaptive conditioned responses — habits — rather than symptoms of underlying unconscious conflicts, and that they could therefore be treated by the direct application of conditioning and learning principles. Arnold Lazarus had also used the term independently in South Africa in 1958. Eysenck's championing of the term, his founding of the journal Behaviour Research and Therapy (1963), and his challenge to psychotherapy's effectiveness were pivotal in establishing behaviour therapy as a recognised clinical and research field.

Eysenck's 1952 paper "The Effects of Psychotherapy: An Evaluation" was one of the most controversial papers in clinical psychology. What did it claim, and why was this so significant?

A: It demonstrated that behaviour therapy was significantly more effective than psychoanalysis for neurotic disorders — triggering the replacement of analysis by behavioural methods

B: It claimed that neurotic patients who received psychoanalysis or eclectic psychotherapy recovered no faster than those who received no formal treatment, suggesting psychotherapy's effectiveness was questionable — galvanising the search for evidence-based alternatives

C: It presented the first randomised controlled trial comparing psychotherapy to medication, finding no difference between treatments

D: It argued that conditioning-based treatments were no more effective than placebo, but that psychotherapy was superior

Correct: It claimed that neurotic patients who received psychoanalysis or eclectic psychotherapy recovered no faster than those who received no formal treatment, suggesting psychotherapy's effectiveness was questionable — galvanising the search for evidence-based alternatives

Eysenck surveyed 24 studies and concluded that approximately two-thirds of neurotic patients improved whether or not they received psychotherapy — suggesting the therapy was no more effective than spontaneous remission. The paper's methodology has been widely and rightly criticised (non-random samples, inconsistent outcome criteria, mixing of therapist quality), but its impact was transformative. It created an urgent clinical and scientific problem: if the dominant therapeutic approach could not demonstrate its effectiveness, what should replace it? Behaviour therapists answered that call, positioning their approaches as scientifically testable alternatives. The paper also launched the psychotherapy outcome research field and the expectation that therapies should be tested in controlled trials.

Joseph Wolpe's systematic desensitisation was built on his concept of "reciprocal inhibition." What does this principle state?

A: Fear responses are reciprocally related to their antecedent stimuli — the stronger the stimulus, the stronger the fear response, in linear proportion

B: A response that is physiologically incompatible with anxiety (such as deep muscle relaxation) can inhibit the anxiety response when the two are paired together — gradually weakening the conditioned connection between the stimulus and fear

C: Classical conditioning and operant conditioning reciprocally inhibit each other — conditioning-based fear can be extinguished by removing operant reinforcement

D: Therapist empathy inhibits patient anxiety — the therapeutic relationship provides safety cues that override conditioned fear responses

Correct: A response that is physiologically incompatible with anxiety (such as deep muscle relaxation) can inhibit the anxiety response when the two are paired together — gradually weakening the conditioned connection between the stimulus and fear

Wolpe, drawing on Sherrington's neurophysiology and Hull's learning theory, proposed that if a response incompatible with anxiety could be elicited in the presence of the anxiety-provoking stimulus, the anxiety would be inhibited. He found deep muscular relaxation (derived from Jacobson) to be the most clinically useful incompatible response. Patients were first trained in progressive relaxation, then asked to imagine items from an anxiety hierarchy — starting with the least feared — while maintaining relaxation. The relaxation inhibited the anxiety response, gradually decoupling stimulus from fear. Systematic desensitisation became the dominant treatment for phobias and was the first behaviour therapy method to be rigorously evaluated in controlled studies.

Arnold Lazarus is credited with broadening behaviour therapy beyond classical and operant conditioning. What is BASIC ID, and why was it significant?

A: BASIC ID stands for Behaviour, Affect, Sensation, Imagery, Cognition, Interpersonal, Drugs/Biology — a multimodal framework asserting that comprehensive treatment must assess and address all seven modalities, not just overt behaviour

B: BASIC ID is a diagnostic checklist for measuring severity across the anxiety disorders spectrum — useful for treatment matching

C: BASIC ID stands for Beck's Associative Schema and Imagery Cognitive Inventory Diagnostic framework — developed collaboratively with Beck

D: It is an acronym for the five core components of systematic desensitisation — Breathing, Anxiety hierarchy, Stimulus exposure, Imaginal rehearsal, Counter-conditioning, In vivo exposure, Discharge

Correct: BASIC ID stands for Behaviour, Affect, Sensation, Imagery, Cognition, Interpersonal, Drugs/Biology — a multimodal framework asserting that comprehensive treatment must assess and address all seven modalities, not just overt behaviour

Lazarus argued that pure behaviour therapy — focused only on observable behaviour — was too narrow to address the full range of human psychological problems. His multimodal therapy (formalised in the 1970s) proposed that human experience and disorder could be comprehensively mapped across seven interactive modalities: Behaviour (what a person does), Affect (emotions), Sensation (physical sensations), Imagery (mental images and memories), Cognition (thoughts, beliefs, attitudes), Interpersonal (relationship patterns), and Drugs/Biology (physiological and substance factors). Treatment should target whichever modalities are relevant — a "technical eclecticism" that anticipated the personalised, formulation-driven approach that characterises modern CBT. Lazarus also independently coined the term "behaviour therapy" in a 1958 South African publication.

Albert Bandura's Bobo doll experiments (1961–1963) challenged a core assumption of radical behaviourism. What did they demonstrate?

A: That children learn aggressive behaviour only through direct operant reinforcement of their own aggressive acts

B: That children acquire behaviours through observation alone — without performing the behaviour or receiving reinforcement themselves — challenging the requirement for direct conditioning in all learning

C: That media exposure to violence reduces aggression through catharsis — the "discharge" of violent impulses

D: That cognitive distortions about violence, not observational learning, explain aggressive behaviour in children

Correct: That children acquire behaviours through observation alone — without performing the behaviour or receiving reinforcement themselves — challenging the requirement for direct conditioning in all learning

In Bandura's Bobo doll studies, children who observed an adult model behave aggressively toward an inflatable doll subsequently showed similar aggression — even though the children had never performed these behaviours themselves and had received no reinforcement. This vicarious learning demonstrated that cognition mediates behaviour: the child must attend to the model, represent the behaviour in memory, be motivated to reproduce it, and have the motor capacity to do so. This finding was a direct challenge to Skinner's insistence that all learning requires direct reinforcement, and positioned social learning theory as a bridge between pure behaviourism and cognitive psychology — clearing space for the cognitive revolution in therapy that Ellis and Beck were simultaneously advancing.

Bandura's concept of self-efficacy (1977) became one of the most clinically influential in CBT. What does self-efficacy mean and why does it matter therapeutically?

A: Self-efficacy is self-esteem — belief in one's global worth as a person. High self-efficacy protects against depression

B: Self-efficacy is the belief in one's capacity to perform the specific behaviours needed to produce a particular outcome. It determines what people attempt, how long they persist when they encounter difficulty, and how they recover from failure — making it a key target and mechanism of change in CBT

C: Self-efficacy is the unconscious sense of personal agency proposed by psychoanalysis — related to ego strength

D: Self-efficacy is the belief that one's environment is controllable — equivalent to Rotter's internal locus of control

Correct: Self-efficacy is the belief in one's capacity to perform the specific behaviours needed to produce a particular outcome. It determines what people attempt, how long they persist when they encounter difficulty, and how they recover from failure — making it a key target and mechanism of change in CBT

Bandura proposed that self-efficacy — task-specific beliefs about what one is capable of doing — is the most proximal determinant of behaviour. It is built through four sources: mastery experiences (succeeding at the task), vicarious modelling (seeing similar others succeed), verbal persuasion (being told "you can do this"), and physiological state (interpreting bodily arousal as competence rather than threat). In CBT, improving self-efficacy is both a mechanism of change (behavioural experiments build it) and a target outcome. Behavioural activation for depression, graduated task assignment, and all forms of exposure therapy work partly by building mastery experiences that restore self-efficacy.

Albert Ellis developed Rational Emotive Behaviour Therapy (REBT) in 1955. What is the ABC model at its core, and how does Ellis's approach differ from Beck's?

A: A = Activating event, B = Belief, C = Consequence. Ellis and Beck are virtually identical — both use collaborative empiricism to test beliefs against evidence

B: A = Activating event, B = Belief (rational or irrational), C = Emotional/behavioural Consequence. Ellis targeted universal irrational beliefs (demanding, awfulising, low frustration tolerance) using direct philosophical disputation; Beck targeted idiosyncratic automatic thoughts and schemas through collaborative empirical testing

C: A = Affect, B = Behaviour, C = Cognition — Ellis argued that emotions cause thoughts, reversing the direction of causation assumed in Beck's model

D: A = Antecedent, B = Behaviour, C = Consequence — a pure operant framework Ellis applied to cognitive processes

Correct: A = Activating event, B = Belief (rational or irrational), C = Emotional/behavioural Consequence. Ellis targeted universal irrational beliefs (demanding, awfulising, low frustration tolerance) using direct philosophical disputation; Beck targeted idiosyncratic automatic thoughts and schemas through collaborative empirical testing

Ellis's ABC model holds that emotional Consequences (C) are caused not by Activating events (A) but by the person's Beliefs (B) about those events. Ellis identified a set of universal irrational beliefs — absolute demands (must/should/ought), awfulising (it's terrible), low frustration tolerance ("I can't stand it"), and global self-rating ("I am worthless") — and used active, directive, sometimes confrontational philosophical Disputation (D) to replace them with more rational beliefs, producing an Effect (E). Beck, by contrast, identified idiosyncratic automatic thoughts and underlying schemas specific to each patient, and used collaborative Socratic questioning and behavioural experiments to test these beliefs empirically. Ellis was more philosophical and directive; Beck more empirical and collaborative.

Carlo Perris (1928–2000) is a figure in CBT history who is less well-known in English-language texts. What was his distinctive contribution?

A: He developed ACT (Acceptance and Commitment Therapy) in Sweden before Hayes formalised it in the USA

B: He developed cognitive therapy independently in Europe — particularly in Sweden — with a specific focus on patients with schizophrenia and personality disorders, and was a key figure in establishing CBT as an international movement

C: He co-authored the Beck Depression Inventory with Aaron Beck and Claude Perris (his brother), which became the most used self-report measure for depression

D: He was the first European psychotherapist to conduct a randomised controlled trial of behaviour therapy, comparing it to psychoanalysis

Correct: He developed cognitive therapy independently in Europe — particularly in Sweden — with a specific focus on patients with schizophrenia and personality disorders, and was a key figure in establishing CBT as an international movement

Carlo Perris worked at Umeå University in Sweden and independently developed cognitive therapy approaches — particularly for patients with bipolar disorder, schizophrenia, and personality disorders — at approximately the same time as Beck was developing cognitive therapy for depression in the USA. His "cognitive milieu therapy" adapted cognitive principles to inpatient psychiatric settings and was among the first to address psychotic presentations with cognitive techniques. Perris was also instrumental in establishing the European Association for Behavioural and Cognitive Therapies (EABCT), helping to build CBT's international infrastructure. His work is a reminder that the cognitive revolution in therapy was not solely an American development.

Aaron Beck did not set out to develop a cognitive alternative to psychoanalysis. What clinical observation led him there?

A: Beck found that antidepressant medication eliminated negative thoughts, leading him to conclude that cognition was a secondary symptom of biological illness — but further research convinced him otherwise

B: Beck initially set out to validate the psychoanalytic hypothesis that depression reflects "anger turned inward." Instead, systematic examination of depressed patients' dreams and automatic thoughts revealed not hostility but a pervasive pattern of negative thinking about the self, world, and future — the cognitive triad

C: Beck observed that depressed patients who underwent behaviour therapy improved cognitively without explicit cognitive intervention, suggesting that behaviour drives cognition

D: Beck's interest was originally in classical conditioning of depressive mood states — he moved to cognitive models only after conditioning failed to explain chronic depression

Correct: Beck initially set out to validate the psychoanalytic hypothesis that depression reflects "anger turned inward." Instead, systematic examination of depressed patients' dreams and automatic thoughts revealed not hostility but a pervasive pattern of negative thinking about the self, world, and future — the cognitive triad

Beck began as a psychoanalytically trained psychiatrist who wanted to empirically test — and expected to confirm — the psychoanalytic account of depression as aggression directed inward (masochism). He examined depressed patients' dreams and free associations looking for hostility themes. Instead, he found that both the dreams and the spontaneous, rapid cognitions that arose during sessions (which he came to call "automatic thoughts") were dominated by themes of loss, failure, and worthlessness — not anger. This led him to develop the cognitive triad model: that depression is characterised by systematic negative bias in views of the self, the ongoing world, and the future. The therapeutic implication — identify and modify these cognitions — led to cognitive therapy. Beck's willingness to let data override his theoretical priors is itself a model of scientific practice.

Beck's cognitive triad describes three domains of systematic negative thinking that characterise depression. What are they?

A: Negative views of the past, the present, and the future

B: Negative views of the self ("I am worthless"), the world / ongoing experience ("Nothing goes right"), and the future ("Things will never improve")

C: Negative views of relationships, work, and personal health

D: Cognitive distortions, core beliefs, and maladaptive schemas — a three-level hierarchy of cognition

Correct: Negative views of the self ("I am worthless"), the world / ongoing experience ("Nothing goes right"), and the future ("Things will never improve")

Beck identified three consistently negative domains of thinking in depressed patients: (1) negative views of the self — seeing oneself as defective, inadequate, or worthless; (2) negative views of ongoing experience — interpreting current events through a lens of failure, deprivation, or rejection; and (3) negative views of the future — pessimistic expectations, hopelessness about change. The triad is not simply sadness — it is a systematic cognitive distortion across three domains. Hopelessness — the negative future component — is the element most strongly associated with suicidal ideation, making assessment of the cognitive triad clinically important beyond diagnosis.

True or False: Aaron Beck developed the cognitive model of depression specifically to disprove psychoanalysis — he was motivated from the outset by dissatisfaction with psychodynamic theory.

Answer: False

Beck's motivation was the opposite of disproof — he set out to validate the psychoanalytic hypothesis that depression reflects anger turned inward. It was only after systematic examination of patients' dreams and automatic thoughts failed to show the expected hostility — and instead revealed pervasive negative thinking about self, world, and future — that Beck departed from the psychoanalytic framework. His cognitive model emerged from letting the data lead rather than from prior theoretical opposition. This origin story matters: it illustrates that scientific progress often comes from the willingness to follow unexpected findings rather than from preconceived agendas.

The move from "first-wave" to "second-wave" CBT represented a fundamental shift in how psychological disorders were conceptualised. What was the key change?

A: First-wave therapy was group-based; second-wave therapy was individual. The shift was from social to individual treatment formats

B: First-wave behaviour therapy viewed psychological disorders as maladaptive learned behaviours, best treated by direct modification of the behaviour itself. Second-wave CBT added the insight that cognitions (thoughts, beliefs, interpretations) mediate behaviour and emotion, making cognitive change a necessary and central therapeutic target

C: First-wave therapy was biologically based (medication). Second-wave therapy replaced medication with purely psychological approaches

D: First-wave therapy used short-term techniques (six sessions maximum). Second-wave CBT extended to long-term treatment to address deeper personality pathology

Correct: First-wave behaviour therapy viewed psychological disorders as maladaptive learned behaviours, best treated by direct modification of the behaviour itself. Second-wave CBT added the insight that cognitions (thoughts, beliefs, interpretations) mediate behaviour and emotion, making cognitive change a necessary and central therapeutic target

First-wave behaviour therapy, rooted in Pavlovian and Skinnerian learning theory, treated psychological problems as learned habits — conditioned responses that could be directly unlearned through counter-conditioning, extinction, or reinforcement of alternative behaviours. What a person thought about their situation was either irrelevant or simply another behaviour. Second-wave CBT — introduced by Ellis, Beck, and Bandura — held that cognitions are not peripheral but central mediating processes. How a person interprets an event determines their emotional and behavioural response. Changing the interpretation changes the response. This added a cognitive level of intervention that first-wave therapy lacked, and it opened the door to treating the broader range of disorders for which pure behavioural techniques had shown limited efficacy.

True or False: Mowrer's two-factor theory explains both the acquisition of fear (via classical conditioning) and its maintenance over time (via operant reinforcement of avoidance) — and the maintenance component is the reason exposure therapy must prevent avoidance to be effective.

Answer: True

This is precisely Mowrer's insight and its clinical implication. The first factor (classical conditioning) explains why fear develops: a previously neutral stimulus becomes feared through pairing with an aversive outcome. The second factor (operant conditioning) explains why it persists: whenever the person avoids the feared stimulus, anxiety drops immediately — a powerful negative reinforcement that makes avoidance increasingly likely. Because avoidance prevents the person from experiencing the feared stimulus in the absence of harm, it also prevents extinction of the conditioned fear. Exposure therapy breaks this maintenance cycle by preventing avoidance (either through in vivo or interoceptive exposure without safety behaviours), allowing the conditioned fear to extinguish or for new inhibitory learning to occur.