Comprehensive Schizophrenia Notes - AQA Psychology Paper 3

Understanding Schizophrenia

You'll often hear people misuse the term "schizophrenia," but it's actually quite specific. The name literally means "split mind," but this refers to a split between thought processes and reality, not multiple personalities.

This condition typically shows up during late adolescence and early adulthood - precisely when many of you are navigating major life changes. It's more common in men, city dwellers, and people from lower socio-economic backgrounds.

Positive symptoms (Type 1) add things that shouldn't be there - like hallucinations (seeing or hearing things that aren't real), delusions (false beliefs), and disorganised speech. These are actually quite rare but get the most attention.

Negative symptoms (Type 2) take away normal abilities. These include speech poverty (reduced talking), avolition (lack of motivation), and anhedonia (inability to feel pleasure). These symptoms are more common and last longer, making them particularly challenging to live with.

Quick Fact: The DSM-5 only needs 1 positive symptom for diagnosis, while ICD-11 requires 2+ negative symptoms.

Diagnosis Challenges

Diagnosing schizophrenia isn't as straightforward as you might think. While Osorio et al (2019) found excellent reliability rates (inter-rater +9.7, test-retest +9.2), there are serious issues lurking beneath the surface.

The famous Rosenhan (1973) study exposed major flaws when 7 fake patients were institutionalised just for claiming they heard voices. When psychiatrists tried to spot fakes later, they incorrectly identified 40 genuine patients as frauds.

Cheniaux et al (2009) revealed shocking inconsistency - the same 100 patients received 39 diagnoses using DSM-5 but 68 using ICD-11. That's a massive difference that could completely change someone's treatment path.

Gender and cultural bias create additional problems. Men get diagnosed more often, whilst Afro-Caribbean British people are 9x more likely to receive a schizophrenia diagnosis. Women might be under-diagnosed because they often have better support systems that help them function.

Reality Check: Many symptoms overlap with depression and bipolar disorder, making accurate diagnosis even trickier.

Genetic Factors

Your genes definitely play a role, but it's not as simple as inheriting schizophrenia like eye colour. Gottesman (1991) found that if one identical twin has schizophrenia, there's only a 48% chance the other will develop it too - far from the 100% you'd expect if genes were everything.

The condition is polygenic, meaning multiple genes are involved. Ripke et al (2014) compared 37,000 patients with 113,000 controls and identified 108 genetic combinations linked to schizophrenia.

Mutations can cause schizophrenia even without family history. Brown et al (2002) discovered that older fathers have higher risk - 0.7% for dads under 25 versus 2% for those over 50.

The original dopamine hypothesis suggested people with schizophrenia have excess dopamine receptors, causing hallucinations and speech problems. However, the updated version by Davis et al (1991) proposes low dopamine in the prefrontal cortex leads to high levels elsewhere.

Research shows amphetamines (which increase dopamine) can trigger schizophrenia-like symptoms, whilst drugs that block dopamine often reduce symptoms.

Think About It: If genetics were the whole story, identical twins would have 100% concordance rates - but they don't.

Drug Treatments

Typical antipsychotics like Chlorpromazine were developed in the 1950s and revolutionised treatment. They work as dopamine antagonists, blocking dopamine activity and providing sedative effects to calm patients.

Atypical antipsychotics are newer and often more effective. Clozapine was initially withdrawn after causing deaths but returned in the 1980s for treatment-resistant cases. It works on dopamine, serotonin, and glutamate systems.

Side effects can be brutal. Short-term effects include dizziness, weight gain, and stiff jaw. Long-term use can cause Tardive Dyskinesia - involuntary facial movements that may be permanent.

The most serious risk is Neuroleptic Malignant Syndrome, which can cause high fever, delirium, and coma. This happens when drugs block dopamine in the hypothalamus.

Meltzer (2012) found clozapine effective in 30-50% of treatment-resistant cases, whilst Thornley et al (2003) showed chlorpromazine significantly outperformed placebos.

Important: Many studies only examine short-term effects and may suffer from publication bias, exaggerating positive results.

Family and Cognitive Factors

Family dysfunction theories suggest certain family environments might trigger schizophrenia. The schizophrenogenic mother concept (thankfully outdated) blamed cold, controlling mothers for causing the condition.

Double-bind theory proposes that mixed messages from parents create confusion and fear. Children receiving contradictory communications might lose trust in their own perceptions, potentially leading to delusions.

Expressed emotion - high levels of criticism, hostility, or over-involvement from family - significantly increases relapse rates and stress levels for people with schizophrenia.

Cognitive explanations focus on faulty thinking processes. Meta-representation problems mean people can't recognise their own thoughts and behaviours, leading to hallucinations and delusions.

Central control dysfunction makes it hard to suppress automatic responses whilst performing deliberate actions, resulting in disorganised speech and behaviour.

Stirling et al used the Stroop test and found schizophrenia patients took twice as long as controls to name ink colours, suggesting cognitive processing difficulties.

Key Point: Research consistently shows adults with schizophrenia have disproportionately high rates of childhood trauma and insecure attachment.

Psychological Treatments

Cognitive Behavioural Therapy (CBT) involves 5-20 sessions focusing on challenging irrational thoughts and behaviours. It helps normalise hallucinations and test the reality of delusions.

Juahar et al (2014) found clear evidence for CBT's effectiveness across 34 studies, whilst Pontillo (2016) showed it reduced frequency and severity of auditory hallucinations.

Family therapy aims to improve communication between family members and reduce expressed emotion. It's one of the most consistently effective treatments, with McFarlane (2016) showing 50-60% reduction in relapse rates.

The therapy follows structured steps: sharing information, identifying resources, encouraging understanding, spotting unhelpful patterns, skills training, and relapse prevention planning.

Token economies use behavioural modification, rewarding socially desirable behaviours. They're particularly useful for long-term patients who've developed maladaptive behaviours in hospital settings.

These psychological approaches work best alongside medication rather than as standalone treatments.

Success Story: NICE consistently recommends both CBT and family therapy as evidence-based treatments for schizophrenia.

The Complete Picture

The most sensible approach combines biological and psychological explanations - called the interactionist approach. Tienari et al (2004) studied 19,000 Finnish adoptees and found genetic risk only led to schizophrenia when combined with dysfunctional family environments.

Tarrier et al (2004) randomly assigned 315 participants to different treatment groups and discovered that combination treatments (medication plus CBT or counselling) were more effective than medication alone.

This suggests both biological vulnerabilities and environmental triggers work together. You might inherit a genetic predisposition, but environmental factors like family stress, trauma, or drug use might be needed to actually trigger the condition.

However, critics like Jarvis & Okami (2019) warn against the treatment-causation fallacy - just because combined treatments work doesn't necessarily prove the interactionist explanation is correct.

The reality is that schizophrenia is incredibly complex, involving genetic, neurochemical, psychological, and social factors all interacting in ways we're still trying to understand.

Bottom Line: No single explanation captures the full complexity of schizophrenia - it's likely a combination of multiple factors working together.