Psychopathology

Definitions of Abnormality

Statistical Infrequency

Abnormality is defined as any behaviour or characteristic that deviates significantly from the statistical norm (the average or mean). Behaviours that are statistically rare (e.g., an IQ below $70$ or above $130$) are considered abnormal.

Strengths: provides an objective, quantitative measure; useful for defining certain conditions (e.g., intellectual disability disorder requires IQ below $70$).

Limitations: statistically rare behaviours are not always undesirable (high intelligence, exceptional athletic ability). Statistical frequency depends on the population sampled; a behaviour may be abnormal in one culture but normal in another. The definition does not distinguish between desirable and undesirable deviations.

Deviation from Social Norms

Abnormality is defined as behaviour that violates unwritten rules (social norms) about what is acceptable in a particular society or culture. Examples: talking to oneself in public, undressing in a public place, extreme aggression.

Strengths: reflects societal standards and practical concerns about behaviour that causes disruption or distress.

Limitations: social norms vary across cultures, historical periods, and subcultures (e.g., hearing voices may be normal in some religious traditions but abnormal in secular Western contexts). Deviation from social norms is not always a sign of psychological disorder (political dissent, eccentricity). Social norms change over time (homosexuality was classified as a mental disorder in the DSM until 1973).

Failure to Function Adequately

Abnormality is defined as an inability to cope with the demands of everyday life. Indicators include: personal distress, inability to maintain relationships, inability to hold employment, irrational or dangerous behaviour, and distress caused to others.

Strengths: focuses on the individual's subjective experience and practical consequences; aligns with clinical assessment.

Limitations: some psychological disorders (e.g., psychopathy) do not cause personal distress — the individual may function well in some domains while causing harm to others. Cultural variation in what constitutes "adequate functioning." Some individuals who do not function adequately (e.g., severe poverty, political persecution) are not psychologically disordered. Eccentric or creative individuals may not conform to conventional functioning without being disordered.

Deviation from Ideal Mental Health

Jahoda (1958) proposed that abnormality is a deviation from ideal mental health, characterised by six criteria:

1. Self-attitudes: high self-esteem and a strong sense of identity
2. Personal growth and self-actualisation: realising one's potential
3. Integration: coping with stress and achieving psychological balance
4. Autonomy: independence and self-determination
5. Accurate perception of reality: not distorting reality through delusions or hallucinations
6. Environmental mastery: adapting to and influencing one's environment

Strengths: provides a positive, aspirational definition of mental health rather than defining abnormality purely by the absence of normality.

Limitations: very few people meet all six criteria consistently; the definition is overly idealistic and pathologises normal human variation. Cultural variation in what constitutes "ideal" mental health (e.g., individualism vs. collectivism). Difficult to measure objectively.

Phobias

Characteristics

A phobia is an anxiety disorder characterised by an excessive, irrational, and persistent fear of a specific object, situation, or activity. The fear is disproportionate to the actual danger and significantly interferes with the individual's daily functioning.

Emotional characteristics: intense, persistent anxiety and panic when exposed to the phobic stimulus; anticipatory anxiety (fear of encountering the stimulus).

Behavioural characteristics: avoidance of the phobic stimulus (which maintains the phobia by preventing disconfirmation of the fear); panic responses (screaming, fleeing, freezing).

Cognitive characteristics: selective attention to the phobic stimulus (vigilance for its presence); irrational beliefs about the danger it poses (catastrophic thinking); irrational thoughts persist despite contradictory evidence.

Behavioural Explanation

The two-process model (Mowrer, 1960): phobias are acquired through classical conditioning and maintained through operant conditioning.

1. Acquisition (classical conditioning): a neutral stimulus (e.g., a dog) becomes associated with an unconditioned stimulus that naturally produces fear (e.g., being bitten). The dog becomes a conditioned stimulus that elicits a conditioned fear response.

2. Maintenance (operant conditioning): avoidance of the phobic stimulus is negatively reinforced (removal of anxiety), which strengthens the avoidance behaviour. The individual never learns that the stimulus is safe, so the phobia is maintained.

Evidence: Watson and Rayner (1920) conditioned "Little Albert" to fear a white rat by pairing it with a loud noise. The fear generalised to other white, furry objects.

Emotional Explanation

The preparedness hypothesis (Seligman, 1971): humans are biologically prepared (through evolution) to develop phobias of stimuli that were dangerous to our ancestors (snakes, spiders, heights, darkness, enclosed spaces). Phobias of modern dangers (electrical outlets, guns, cars) are rare, despite these being more genuinely dangerous. Prepared phobias are acquired more easily, are more resistant to extinction, and are non-cognitive (do not require conscious awareness of the conditioning event).

Evidence: Ohman et al. (2001) found that participants conditioned to fear snakes and spiders showed no extinction, whereas those conditioned to fear flowers and mushrooms extinguished rapidly.

Cognitive Explanation

Phobias are maintained by irrational cognitive processes:

• Selective attention: the individual vigilantly scans the environment for the phobic stimulus, confirming their belief that it is common and dangerous
• Irrational beliefs: catastrophic thinking ("the spider will bite me and I will die") that is not proportionate to the actual risk
• Cognitive biases: the individual overestimates the probability and severity of negative outcomes associated with the phobic stimulus

Treatment

Systematic desensitisation (Wolpe, 1958): based on classical conditioning. The patient constructs an anxiety hierarchy (a ranked list of increasingly anxiety-provoking situations involving the phobic stimulus). The patient then progresses through the hierarchy while practising relaxation techniques (deep breathing, progressive muscle relaxation). Through counterconditioning, the phobic stimulus becomes associated with relaxation rather than fear. Research shows systematic desensitisation is effective for specific phobias (McGrath et al., 1990, found a success rate of approximately $75\%$).

Flooding: the patient is exposed to the phobic stimulus at maximum intensity for a prolonged period without the option of escape. The initial panic response eventually extinguishes when the patient learns that no harm occurs. Effective but highly distressing, with high dropout rates.

Cognitive behavioural therapy (CBT): identifies and challenges irrational thoughts and beliefs about the phobic stimulus. The therapist helps the patient develop more realistic cognitions and behavioural experiments to test their fears.

Depression

Characteristics

Emotional: persistent low mood (sadness, emptiness, hopelessness); anhedonia (loss of pleasure in previously enjoyed activities); anxiety.

Behavioural: social withdrawal and isolation; reduced activity levels (psychomotor retardation or agitation); disrupted sleep patterns (insomnia or hypersomnia); changes in appetite and weight; self-neglect; suicidal ideation or behaviour.

Cognitive: negative thoughts about the self ("I am worthless"), the world ("the world is unfair"), and the future ("nothing will improve") — Beck's cognitive triad; poor concentration; indecisiveness; rumination (repetitively thinking about negative experiences).

Behavioural Explanation

Lewinsohn's (1974) behavioural model: depression results from a reduction in positive reinforcement. When an individual experiences a significant loss (e.g., job loss, bereavement, relationship breakdown), the number of rewarding activities decreases. The individual withdraws from social interaction, further reducing opportunities for positive reinforcement. This creates a vicious cycle of withdrawal, reduced reinforcement, and deepening depression.

Evidence: Lewinsohn found that depressed individuals engaged in fewer pleasant activities and that behavioural activation (increasing engagement in rewarding activities) was effective in reducing depressive symptoms.

Cognitive Explanation

Beck's cognitive theory (1967, 1976): depression is caused by negative schemas (dysfunctional beliefs about the self, the world, and the future) that are activated by stressful life events. These schemas produce systematic cognitive biases:

• Negative automatic thoughts: spontaneous, irrational negative thoughts ("I am a failure," "nobody likes me")
• Cognitive triad: negative thoughts about the self, the world, and the future
• Errors in logic: catastrophising, overgeneralisation, black-and-white thinking, personalisation, selective abstraction

Ellis's ABC model (1962): depression is caused by irrational beliefs (B), not by activating events (A) themselves. The consequences (C) — emotional and behavioural responses — are determined by the individual's beliefs about the event, not the event itself. For example, failing an exam (A) is not inherently depressing; the depression results from the irrational belief "I must always succeed" (B).

Biological Explanation

Genetic factors: family and twin studies suggest a heritable component. First-degree relatives of individuals with depression are approximately $2$--$3$ times more likely to develop depression themselves. McGuffin et al. (1996) found a concordance rate of $46\%$ for MZ twins and $20\%$ for DZ twins.

Neurotransmitter factors: the monoamine hypothesis proposes that depression is caused by a deficiency in serotonin and/or noradrenaline. SSRIs (selective serotonin reuptake inhibitors) increase serotonin availability and are effective antidepressants for many patients, though they do not work for everyone, suggesting that the monoamine hypothesis is incomplete.

Cortisol and the HPA axis: chronic stress activates the hypothalamic-pituitary-adrenal (HPA) axis, increasing cortisol production. Elevated cortisol levels are consistently found in depressed patients and may damage the hippocampus, impairing mood regulation.

Treatment

Antidepressant medication: SSRIs (e.g., fluoxetine/Prozac) block the reuptake of serotonin, increasing its availability in the synaptic cleft. Effective for moderate to severe depression but associated with side effects (nausea, insomnia, sexual dysfunction) and a delayed onset of action ($2$--$4$ weeks).

CBT: challenges negative automatic thoughts and cognitive distortions, replacing them with more realistic, balanced cognitions. Beck et al. (1979) found that CBT was as effective as antidepressant medication for mild to moderate depression, with lower relapse rates.

Combined treatment: CBT combined with antidepressants is often the most effective approach, particularly for severe depression.

Obsessive-Compulsive Disorder (OCD)

Characteristics

Obsessions: persistent, intrusive, and distressing thoughts, images, or urges that the individual recognises as irrational but cannot control. Common obsessions include contamination fears, aggressive thoughts, symmetry and order concerns, and sexual or religious intrusive thoughts.

Compulsions: repetitive behaviours or mental acts performed in response to obsessions, according to rigid rules, or to reduce distress. Common compulsions include hand washing, checking (locks, switches, appliances), ordering and arranging, counting, and mental rituals (praying, repeating words).

The individual typically recognises that the obsessions and compulsions are excessive or unreasonable (insight), but feels compelled to perform them to reduce anxiety.

Behavioural Explanation

OCD is acquired and maintained through conditioning:

1. Acquisition: a neutral stimulus (e.g., touching a doorknob) becomes associated with anxiety through pairing with a fear-inducing event (e.g., a news story about infection). The doorknob becomes a conditioned stimulus that elicits anxiety.

2. Maintenance: compulsive behaviour (hand washing) is negatively reinforced (anxiety reduction), strengthening the compulsion. The individual learns that performing the compulsion reduces anxiety, but this prevents the extinction of the fear response.

Cognitive Explanation

Dysfunctional beliefs: individuals with OCD hold exaggerated beliefs about the importance of their thoughts and their responsibility for preventing harm:

• Inflated responsibility: the belief that one has the power and responsibility to prevent negative events
• Thought-action fusion: the belief that having a thought is morally equivalent to performing the action, or that thinking about an event makes it more likely to occur
• Intolerance of uncertainty: the need for certainty and inability to tolerate doubt
• Perfectionism: the belief that imperfect actions are unacceptable and dangerous

These beliefs lead to hypervigilance for threat cues, catastrophic misinterpretation of normal intrusive thoughts, and compulsive attempts to neutralise perceived danger.

Biological Explanation

Genetic factors: OCD has a heritability estimate of approximately $40$--$50\%$. Nestadt et al. (2010) found that individuals with a first-degree relative with OCD were approximately $5$ times more likely to develop OCD themselves. Candidate genes include those involved in the serotonin system (5-HTT gene).

Neural explanations: abnormal functioning in the orbitofrontal cortex (OFC), which is overactive in OCD patients, leading to excessive worry about harm. The caudate nucleus (part of the basal ganglia) is also implicated: it normally acts as a "filter" that suppresses worrying thoughts, but in OCD it is dysfunctional, allowing intrusive thoughts to persist. The thalamus, OFC, and caudate nucleus form a circuit that is hyperactive in OCD.

Neurotransmitter factors: low levels of serotonin are implicated. SSRIs are the first-line pharmacological treatment and are effective for approximately $60\%$ of OCD patients.

Treatment

SSRIs: increase serotonin availability; effective but require higher doses and longer treatment duration than for depression.

CBT with exposure and response prevention (ERP): the patient is gradually exposed to the anxiety-provoking stimulus (exposure) while being prevented from performing the compulsive behaviour (response prevention). Anxiety initially increases but gradually decreases through habituation. The patient learns that the feared outcome does not occur, breaking the cycle of obsessions and compulsions. ERP is highly effective, with success rates of $60$--$80\%$.

Common Pitfalls

• Confusing obsessions (intrusive thoughts) with compulsions (repetitive behaviours). Obsessions are cognitive; compulsions are behavioural.
• Describing depression solely as "feeling sad." Depression involves a constellation of emotional, behavioural, and cognitive symptoms, and a diagnosis requires symptoms persisting for at least two weeks.
• Confusing the behavioural, cognitive, and biological explanations. Each offers a different level of analysis; they are complementary, not mutually exclusive.
• Stating that SSRIs "cure" depression. SSRIs manage symptoms; they do not address underlying cognitive or behavioural patterns, and relapse is common after discontinuation without CBT.
• Describing OCD compulsions as "enjoyable" or "voluntary." Compulsions are performed to reduce distress and are experienced as ego-dystonic (in conflict with the individual's self-concept).

Practice Problems

Problem 1: Definitions of Abnormality

Evaluate the definition of abnormality as deviation from social norms, considering cultural relativism.

The definition of abnormality as deviation from social norms identifies behaviour that violates unwritten societal rules as abnormal. This definition has practical utility because it identifies behaviour that causes social disruption or concern.

However, the definition is fundamentally limited by cultural relativism: social norms are culturally specific. Behaviour considered abnormal in one culture may be normative in another. For example:

• Hearing voices: in Western cultures, auditory hallucinations are typically considered a symptom of schizophrenia. In some African and Asian cultures, hearing the voices of ancestors or spirits is accepted and may carry spiritual significance.
• Personal space: the acceptable distance between conversational partners varies dramatically between cultures (e.g., Latin American vs. Northern European norms).
• Emotional expression: public displays of grief are expected and encouraged at funerals in some cultures but considered excessive in others.

Historical variation also challenges the definition: homosexuality was classified as a mental disorder in the DSM until 1973, reflecting the social norms of the time rather than any genuine psychopathology. This demonstrates that social norms are not a reliable basis for defining abnormality because they are contingent, subjective, and subject to change.

Problem 2: Two-Process Model Application

Using the two-process model, explain how a person might develop a phobia of dogs and how the phobia is maintained.

Acquisition (classical conditioning): A child is playing in a park when a dog runs toward them and knocks them over. The child experiences fear (unconditioned response) in response to the dog (unconditioned stimulus). Through classical conditioning, the dog (now a conditioned stimulus) comes to elicit a fear response (conditioned response), even without being knocked over. The fear may generalise to all dogs or to specific features of dogs (large dogs, dogs barking).

Maintenance (operant conditioning): The child now avoids parks and situations where dogs might be present. This avoidance removes the fear response, which is negatively reinforcing (the removal of an unpleasant stimulus strengthens the behaviour). Each avoidance episode reinforces the belief that dogs are dangerous and that avoidance is necessary for safety. The child never has the opportunity to learn that most dogs are not dangerous, so the phobia is maintained indefinitely.

The two-process model explains both the initial acquisition and the persistent maintenance of phobias, accounting for why phobias can last for decades despite the individual never actually being harmed by the phobic stimulus.

Problem 3: Beck's Cognitive Triad

Explain Beck's cognitive triad and describe how it might apply to a student who has just failed an important exam.

Beck's cognitive triad proposes that depression is maintained by three interconnected patterns of negative thinking:

1. Negative thoughts about the self: the individual views themselves as worthless, inadequate, or unlovable
2. Negative thoughts about the world: the individual views the world as unfair, hostile, or unrewarding
3. Negative thoughts about the future: the individual views the future as hopeless, with no prospect of improvement

Application to the student:

• Negative thoughts about the self: "I failed this exam, which means I am stupid and incompetent. I am a failure as a student."
• Negative thoughts about the world: "The education system is rigged against people like me. My teachers do not understand or support me. Other students are more talented."
• Negative thoughts about the future: "I will never get into university. I will never get a good job. My life is over."

The student may also display cognitive distortions:

• Overgeneralisation: "I failed this exam, so I will fail everything"
• Catastrophising: "This one failure will ruin my entire future"
• Selective abstraction: focusing solely on the exam failure while ignoring previous successes
• Personalisation: "This is entirely my fault; I have no one to blame but myself"

These cognitions create a self-reinforcing cycle: negative thoughts lead to low mood, reduced motivation, social withdrawal, and decreased studying, which leads to further academic difficulties, confirming the negative beliefs.

Problem 4: OCD Explanation Comparison

Compare the biological and cognitive explanations of OCD.

Biological explanation:

• Focuses on genetic, neural, and neurotransmitter factors
• Heritability of approximately $40$--$50\%$ (family and twin studies)
• Overactivity in the orbitofrontal cortex and dysfunction in the caudate nucleus (OFC-caudate-thalamus circuit)
• Serotonin deficiency; SSRIs are effective pharmacological treatment
• Reductionist: explains OCD at the level of brain chemistry and genetics
• Deterministic: suggests OCD is biologically determined, limiting individual agency

Cognitive explanation:

• Focuses on dysfunctional thought processes and beliefs
• Key beliefs: inflated responsibility, thought-action fusion, intolerance of uncertainty, perfectionism
• Intrusive thoughts are catastrophically misinterpreted; compulsions are attempts to neutralise perceived danger
• CBT with ERP is effective treatment, supporting the cognitive model
• Holistic: accounts for the content and meaning of obsessions
• Less deterministic: cognitive processes can be modified through therapy

Comparison: the two explanations operate at different levels of analysis. The biological explanation is strong in identifying genetic and neural risk factors but does not explain why specific obsessions take particular forms. The cognitive explanation accounts for the content of obsessions and compulsions but does not explain why some individuals develop OCD and others do not. A diathesis-stress model integrating both approaches is likely the most comprehensive explanation.

Problem 5: Treatment Evaluation

Evaluate systematic desensitisation and CBT as treatments for psychological disorders, considering strengths and limitations of each.

Systematic desensitisation:

Strengths:

• Effective for specific phobias: McGrath et al. (1990) reported a success rate of approximately $75\%$
• Less distressing than flooding; patients are in control of the pace of exposure
• Relatively quick and cost-effective compared to long-term psychotherapy
• Supported by classical conditioning theory, providing a clear theoretical rationale

Limitations:

• Limited to specific phobias; less effective for complex disorders (depression, OCD)
• Symptom-focused rather than addressing underlying cognitive processes
• May not address co-occurring conditions (e.g., a patient with a phobia and depression)
• Effectiveness depends on the patient's ability to relax, which may be impaired by anxiety

CBT:

Strengths:

• Effective for a wide range of disorders (phobias, depression, anxiety, OCD)
• Addresses the underlying cognitive processes, reducing relapse rates compared to medication alone
• Empowers the patient with skills and strategies they can use independently
• Supported by substantial empirical evidence (NICE guidelines recommend CBT as a first-line treatment for many disorders)

Limitations:

• Requires the patient to be motivated and cognitively able to engage in the process
• May not be suitable for individuals with severe cognitive impairment or very low motivation
• Can be time-consuming and expensive (typically $12$--$20$ sessions)
• The therapeutic relationship is important; a poor alliance reduces effectiveness
• Does not address biological factors (e.g., severe biochemical imbalances may require medication)