1.1 Schizophrenia
- Syllabus
- 9990–2028–2029
- Topic
- 1.1
- Level
- A2
Learning objectives
1.1.1Diagnostic criteria for schizophrenia• 1.1.1 Diagnostic criteria for schizophrenia- diagnostic criteria (ICD-11) of schizophrenia, including symptoms (positive and negative). A case study of schizophrenia.- types of delusions focusing on investigating delusions using virtual reality (exemplified by the following key study).- Key study using virtual reality to investigate persecutory ideation: Freeman et al. (2003).- Relevant issues and debates and methodology for this topic include: individual and situational explanations, idiographic versus nomothetic, case studies, generalisations.1.1.2Explanations of schizophrenia• 1.1.2 Explanations of schizophrenia- biological explanations:- - genetic- - biochemical (the dopamine hypothesis).- psychological (cognitive) explanation.- Relevant issues and debates and methodology for this topic include: individual and situational explanations, nature versus nurture, reductionism versus holism, determinism versus free-will, idiographic versus nomothetic.1.1.3Treatment and management of schizophrenia• 1.1.3 Treatment and management of schizophrenia- biological treatments:- - biochemical including typical and atypical antipsychotics- - electro-convulsive therapy.- psychological therapy: cognitive-behavioural therapy, including a study, e.g. Sensky et al. (2000).- Relevant issues and debates and methodology for this topic include: idiographic versus nomothetic, experiments, longitudinal studies, generalisations, ethics.
Schizophrenia diagnosis integrates symptom domains; VR tests persecutory interpretation under control
ICD-11 schizophrenia diagnosis is a qualified clinical judgement based on a characteristic pattern over time, significant disturbance/impairment and exclusion of better explanations such as substances, medical conditions or mood disorders. Teaching symptom domains supports recognition, not self-diagnosis.
| Domain | Examples | Classification warning |
|---|---|---|
| Positive | Persistent delusions, hallucinations, passivity/control experiences, disorganised thought/speech | Added/distorted experiences—not 'good' |
| Negative | Restricted emotional expression, limited speech, reduced motivation/pleasure and social withdrawal | Reduced usual function—not laziness |
| Psychomotor/disorganisation | Markedly disorganised behaviour, agitation/slowing or unusual postures | Must consider clinical context/exclusions |
| Cognitive | Difficulties in attention, memory and problem-solving | Important functioning profile; not sufficient alone |
Delusions can involve persecution, reference, control/passivity, grandeur or other fixed interpretations. Idiographic case evidence records onset, specific experience, family/social context and functional impact; e.g. an early-onset case may combine academic decline, voices and behavioural change. Rich detail aids formulation but cannot establish population frequency or cause.
| Freeman et al. (2003) element | Exact evidence |
|---|---|
| Aim/sample | Test whether neutral VR characters elicit persecutory thoughts and which factors predict them; 24 nonclinical participants |
| Procedure/setting | Participants entered a standard neutral virtual social environment with computer-generated people, then completed symptom/thought measures |
| VR-Paranoia measure | 15 items, 4-point 0-3 agreement scale; items included ideas such as avatars watching or being hostile |
| Results | Positive views were common; some reported reference/persecution. Persecutory VR thoughts were associated with higher interpersonal sensitivity and anxiety |
| Conclusion | Neutral contexts can receive different social interpretations; vulnerability/anxiety may contribute and VR can study ideation under control |
| Strength | Limitation |
|---|---|
| Same neutral avatars/environment isolate interpretation and permit safe repeatable exposure | Small self-selected nonclinical sample cannot directly generalise to diagnosed schizophrenia |
| Questionnaire plus comments capture quantitative and qualitative appraisal | Self-report/demand and subjective avatar interpretation affect validity |
| VR balances control with social immersion and potential safe clinical application | Technology/artificial embodiment may differ from real relationships and current systems may change temporal validity |
Freeman did not show avatars were hostile or test a schizophrenia treatment. Participants were nonclinical and the result supports a continuum/interpretation method. Diagnosis requires a broader clinical pattern; one unusual belief, voice or VR rating is insufficient.
Genetic vulnerability, dopamine pathways and cognitive monitoring explain different schizophrenia features
| Explanation | Mechanism → symptom | Evidence | Boundary |
|---|---|---|---|
| Genetic | Polygenic inherited vulnerability affects neurodevelopment/risk | Concordance is much higher for identical than non-identical twins; about 50% is a common twin-study estimate | Below 100% means genes are neither necessary nor sufficient; shared environment and diagnostic assumptions matter |
| Dopamine | Excess D2-related activity in subcortical/limbic pathways contributes to positive symptoms; reduced prefrontal dopamine contributes to negative/cognitive symptoms | Antipsychotic action and pathway/imaging evidence support involvement | Treatment response is indirect causal evidence; multiple transmitters/pathways and environment matter |
| Cognitive (Frith) | Faulty central self-monitoring misattributes inner speech/actions to external sources; theory-of-mind/monitoring problems can contribute to hallucinations, delusions and disorganisation | Source-monitoring tasks: patients with incoherent speech can perform worst identifying self/other/computer origin | Cognitive impairment may be consequence/correlate and Frith acknowledges biological contribution |
Case application must link fact to mechanism: an identical twin raises inherited vulnerability but does not determine outcome; a voice perceived as external fits source-monitoring failure; positive and negative symptoms map to different dopamine circuits rather than 'too much dopamine everywhere'.
| Debate | Comparison |
|---|---|
| Nature–nurture | Genes/biochemistry emphasise nature, yet stress/experience can influence expression and cognition |
| Reductionism–holism | Dopamine is biologically reductionist; cognitive model preserves subjective process but remains partial; interaction is more holistic |
| Determinism–free will | Vulnerabilities/processes constrain experience without implying chosen symptoms; coping/treatment preserves agency |
| Nomothetic–idiographic | General models guide prediction, while individual symptom meaning/history guides formulation |
No model means the person chooses hallucinations/delusions. Concordance is association, not a single schizophrenia gene. Dopamine abnormalities differ by pathway. Cognitive explanation concerns impaired attribution/monitoring, not simply irrationality or lack of intelligence.
Schizophrenia management balances antipsychotic, ECT and CBT mechanisms with sustained outcomes and risk
| Treatment | Mechanism/use | Strength | Risk/boundary |
|---|---|---|---|
| Typical antipsychotic | Strong D2 blockade, especially positive-symptom reduction | Established acute efficacy, relatively low cost | Extrapyramidal/tardive effects, sedation; limited negative/cognitive effect |
| Atypical antipsychotic | Broader dopamine/serotonin actions | Can reduce positive symptoms with different movement-risk profile | Metabolic/weight/cardiovascular and other drug-specific risks; response varies |
| ECT | General anaesthetic + muscle relaxant; unilateral/bilateral scalp electrodes deliver brief controlled current causing a seizure | Can be considered in severe/acute resistant presentations | Memory loss/confusion, anaesthetic risk, fear/stigma, consent; relapse can occur |
| CBT | Alliance, psychoeducation, diary/homework, cognitive restructuring/alternative explanations and coping/relaxation | Individualised management of delusions, hallucinations, distress and functioning | Time/engagement/cost; manages responses rather than guaranteeing symptom removal |
| Sensky et al. (2000) | Exact evidence |
|---|---|
| Aim/design | Compare CBT plus routine care with non-specific befriending plus routine care for persistent medication-resistant schizophrenia; randomised controlled design |
| Sample | 90 patients aged 16-60; 46 CBT, 44 befriending; clinics in northern England/London |
| Delivery/control | Mean about 19 individual sessions over up to 9 months; experienced supervised nurses; befriending controls therapist contact |
| Measurement | Blind raters at baseline, post-treatment and 9-month follow-up; positive/negative/depression scales |
| Result | Both groups improved by end of treatment; at follow-up CBT continued/improved while befriending gains did not persist similarly |
| Conclusion | CBT can produce sustained benefit for persistent positive and negative symptoms beyond non-specific contact, within this medication-resistant sample |
For a delusion/voice: build trust; explain symptoms without confrontation; record trigger, belief/voice, emotion and behaviour; examine evidence and generate safer alternative interpretations; rehearse coping/relaxation; complete homework; review functional change. CBT does not search childhood for the cause in this syllabus application.
ECT evaluation separates procedure from outcome: anaesthesia/muscle relaxation and brief seizure; immediate confusion and reported short-term memory loss; some responders relapse within six months. A longitudinal experiment should pre-specify side-effect DVs, comparable treatment groups, other-care controls and repeated follow-ups.
| Lens | Judgement |
|---|---|
| Idiographic–nomothetic | Standard drug/ECT/CBT protocols are nomothetic; dose, goals, beliefs, side effects and response require idiographic tailoring |
| Experiment/longitudinal | Sensky's randomisation, befriending and blind ratings strengthen inference; follow-up tests maintenance, but attrition/sample specificity matter |
| Generalisation | Medication-resistant 16-60-year-old UK patients do not represent all diagnoses, cultures or treatment responders |
| Ethics | Capacity/informed consent, withdrawal, coercion and harm-benefit are acute for ECT/psychosis; recovery-oriented shared decisions matter |
Sensky did not show immediate CBT superiority on every outcome: both groups improved initially, with stronger sustained CBT pattern at follow-up. ECT uses anaesthesia and muscle relaxation. Treatment response does not prove one cause, and management should not be presented as universal or coercive advice.