Component 01: Psychological Problems - Theories/Explanations: Schizophrenia — OCR GCSE Psychology

Component 01 of OCR GCSE Psychology explores mental health problems, dedicating substantial focus to the explanations and clinical features of schizophrenia. Students investigate how biological mechanisms, such as neurochemistry and genetic predisposition, contrast with psychological and sociocultural models to explain the development of psychotic disorders.

Mastering these explanations is essential for developing critical evaluative skills across clinical psychology. It allows students to appreciate the ongoing debate between nature and nurture, equipping them to assess therapeutic interventions such as antipsychotic medication and social support systems.

• →The Dopamine Hypothesis: The theory that an excess of dopamine activity or an overabundance of dopamine D2 receptors in subcortical brain areas mediates positive symptoms.
• →Genetic Predisposition: Research using family and twin studies (e.g. Gottesman) demonstrating higher concordance rates in monozygotic twins (approx. 48%) compared to dizygotic twins (approx. 17%).
• →Social Causation Hypothesis: The psychological theory proposing that living in impoverished, stressful urban environments or belonging to marginalized social groups increases vulnerability to schizophrenia.
• →Diathesis-Stress Model: An interactionist framework proposing that individuals inherit a biological vulnerability (diathesis) that requires environmental stressors (stress) to manifest as schizophrenia.

• Defines positive symptoms as experiences added to normal functioning, such as delusions or hallucinations.
• Defines negative symptoms as reductions in normal functioning, such as flattened affect or reduced speech.
• Gives a concrete example of a delusion or hallucination and labels it correctly as a positive symptom.
• Identifies disorganised thinking or behaviour as a clinical characteristic.
• States that the ICD requires persistence of symptoms over time and significant distress or impairment.
• States that prevalence is the proportion of a population with schizophrenia at a given time, commonly estimated at about 1%.
• Identifies late adolescence and early adulthood as the typical age of onset, with males generally showing earlier onset than females.
• Recognises that higher diagnosed rates in some ethnic minority and migrant groups are explained by social and diagnostic factors as well as any biological ones.
• Describes recovery rates as variable, with many people improving but full recovery being less common and dependent on treatment and how recovery is defined.
• Explains that dopaminergic neurons release dopamine across synapses and that overactive transmission at dopamine receptors is linked to symptoms.
• Links reduced brain volume and altered frontal-lobe activity to difficulties in planning and organised behaviour.
• Connects the hippocampus to memory difficulties and the temporal lobes to auditory hallucinations in schizophrenia.
• Identifies neurological damage as a possible contributor to schizophrenia.
• Evaluates the theory by noting correlational evidence, that antipsychotics do not help everyone, and the nature/nurture debate about environmental stressors.
• Identifies rejection by society as a social process that pushes a person with schizophrenia towards poorer circumstances
• Explains disengagement of individuals as withdrawal from social roles and support that can worsen symptoms
• States that the theory links schizophrenia to downward social movement rather than to biology alone
• Recognises the criticism that cause and effect are hard to establish because drift and symptoms may each influence the other
• Distinguishes correlation from causation when evaluating evidence about social position and schizophrenia
• Identifies that the study examines how monoamines influence cerebral function during a specific prefrontal cognitive activation task in schizophrenia.
• States that amphetamine was used to manipulate monoamine activity and that regional cerebral blood flow indexed cerebral function.
• Recognises that the Wisconsin Card Sorting Test provided the prefrontal cognitive activation during scanning.
• Explains that the study tests the dopamine/monoamine explanation of schizophrenia by linking prefrontal dysfunction to altered rCBF under activation.
• Describes the sample and comparison accurately as reported, without inventing a normal control group that the study did not include.

• 💡Pair every symptom you name with its type, positive or negative, and a brief example.
• 💡Use the ICD framing of duration and impairment rather than listing symptoms alone.
• 💡Keep examples clinical and neutral, avoiding stereotyped portrayals of people with the condition.
• 💡Learn each statistic with its label (prevalence, age, sex, ethnicity, recovery) so you can match a definition to the correct term.
• 💡Use approximate figures such as about 1% and say that estimates vary with diagnostic criteria and study method.
• 💡When a question asks about ethnicity, mention that higher diagnosed rates involve social and diagnostic explanations, not just biology.
• 💡Use the terms dopaminergic neuron, synapse and receptor when explaining the dopamine hypothesis.
• 💡Match each brain region to a specific function and symptom rather than listing regions alone.
• 💡For evaluation, give a criticism and then explain why it weakens the theory, linking to nature and nurture.
• 💡Name both mechanisms, rejection by society and disengagement, before evaluating
• 💡Use the phrase cause and effect when discussing the main criticism, and say why the order of events is unclear
• 💡Link each point to a concrete example such as loss of employment or withdrawal from friends to show understanding
• 💡Anchor each option to one of the study's four elements: monoamine manipulation, prefrontal activation, rCBF measurement, schizophrenia sample.
• 💡Reject options that add groups, measures or brain regions the study did not use.
• 💡Use the phrase 'regional cerebral blood flow during cognitive activation' to keep the dependent measure precise.
• 💡Link the finding back to the dopamine explanation of schizophrenia rather than treating it as a standalone brain study.
• 💡Always differentiate clearly between positive symptoms (behaviours added, such as hallucinations) and negative symptoms (behaviours lost, such as avolition) when discussing explanations.
• 💡When evaluating biological explanations, balance the success of drug therapies against side effects and the fact that drugs do not cure environmental triggers.

• Labels hallucinations as a negative symptom; classify them as positive because they add an experience.
• Treats a single unusual belief as sufficient for diagnosis; note the ICD requirement for persistence and impairment.
• Confuses flattened affect with sadness; describe it as reduced outward emotional expression.
• Ignores disorganised thinking; include it as a recognised clinical characteristic.
• Treats prevalence as the number of new cases each year; correct this by defining prevalence as the proportion of a population with the disorder at a given time.
• Assumes schizophrenia affects males and females at very different overall rates; correct this by noting that the main sex difference is earlier onset in males.
• Explains higher diagnosed rates in some ethnic groups as purely genetic; correct this by including social and diagnostic factors.
• Describes dopamine as a substance that simply 'builds up' without mentioning neurons and synaptic transmission; correct this by explaining release at synapses and receptor activity.
• Attributes all symptoms to one brain region; correct this by matching frontal lobes, hippocampus and temporal lobes to their different functions.
• Treats the biological theory as fully proven; correct this by noting correlational evidence and the nature/nurture debate.
• Claims the theory says society causes schizophrenia directly; correct this by noting the theory describes an association and a downward drift
• Treats the theory as proven by correlation alone; correct this by explaining that cause and effect cannot be ordered from such data
• Confuses social drift with genetic explanations; correct this by keeping the focus on social rejection and disengagement
• Assumes the theory replaces biological accounts entirely; correct this by presenting it as a social explanation that is evaluated alongside others
• Assumes the study included a healthy normal control group; check the reported sample and comparison before selecting an answer.
• Treats rCBF as a direct measure of dopamine levels; keep rCBF as an index of cerebral function and amphetamine as the monoamine manipulation.
• Confuses the cognitive activation task with a mood or memory test; identify the Wisconsin Card Sorting Test as the prefrontal activation task.
• Claims the study measured neurotransmitter release directly; describe the monoamine role as inferred through amphetamine challenge and blood-flow change.
• Believing schizophrenia means 'split personality' or Dissociative Identity Disorder, rather than a split from reality characterised by psychosis.
• Assuming that biological explanations claim genes directly cause schizophrenia without requiring any environmental interaction.
• Thinking dopamine is the only neurotransmitter involved, ignoring recent developments in glutamate and serotonin pathways.

1. 1Week 1, Day 1-2: Master the biological mechanisms, drawing diagrams of synaptic dopamine transmission and memorising Gottesman's concordance figures.
2. 2Week 1, Day 3-4: Study the social causation hypothesis, making notes on urban stress, isolation, and high expressed emotion.
3. 3Week 2, Day 1-2: Practice writing comparative evaluation paragraphs contrasting biological determinism with social models.
4. 4Week 2, Day 3-4: Complete timed 4-mark and 6-mark exam questions, strictly reviewing against official OCR mark schemes.

• 📋Short knowledge recall questions (1-2 marks): Defining key terminology such as 'concordance rate' or 'dopamine'.
• 📋Application scenario questions (3-4 marks): Explaining an individual's diagnosis using either biological or social factors.
• 📋Extended evaluation essays (6 marks): Comparing, contrasting, and evaluating the strengths and weaknesses of biological versus psychological explanations.