Ever wondered what's actually happening in the brain when someone...
Psychology606 views·Updated 13 Sept 2026·2 pagesUnderstanding Biological Reasons for Schizophrenia - AQA A Level Psychology
S
Sophie@sophie_rfgb
1
of 2
Biological Explanations for Schizophrenia
Your family tree might hold more clues about mental health than you'd expect. Genetic explanations for schizophrenia show some pretty striking patterns when researchers study families.
Gottesman's family studies revealed that having two parents with schizophrenia gives you a 46% concordance rate - basically, nearly half of these children develop the condition too. With one affected parent, that drops to 13%, and siblings have about a 9% chance.
Twin studies make the genetic link even clearer. Identical twins (who share 100% of their DNA) have a 40% concordance rate, whilst fraternal twins (sharing 50% of DNA) only show 7%. That's a massive difference that screams genetics.
The dopamine hypothesis offers another piece of the puzzle. Scientists reckon that too much dopamine in certain brain regions triggers the positive symptoms of schizophrenia - like hallucinations and delusions. Brain scans actually show elevated dopamine levels in affected individuals.
Key Insight: The revised dopamine hypothesis is more nuanced - excess dopamine causes positive symptoms, but a deficit in the prefrontal cortex might explain negative symptoms like social withdrawal.
2
of 2
Evaluation and Evidence
Here's where things get really interesting - the research actually backs up these biological theories quite well. Ripke's massive study found 108 gene variations that bump up your schizophrenia risk, showing there's definitely a genetic component at play.
But here's the catch: even identical twins don't have a 100% concordance rate. This tells us that whilst genetic vulnerability matters loads, it's not the whole story - environmental factors must play a role too.
The dopamine research gets solid support from drug studies. Antipsychotic medications that reduce dopamine activity genuinely help schizophrenia patients, which is pretty strong evidence that dopamine levels are involved. Plus, many of those genetic variations researchers found actually affect dopamine production and receptors.
However, critics argue this approach might be guilty of biological reductionism - basically, oversimplifying a complex condition by focusing only on biology whilst ignoring psychological and social factors.
Remember: These biological explanations are brilliant for understanding the 'how' of schizophrenia, but they work best when combined with other approaches that consider life experiences and social context.
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Psychology606 views·Updated 13 Sept 2026·2 pagesUnderstanding Biological Reasons for Schizophrenia - AQA A Level Psychology
S
Sophie@sophie_rfgb
Ever wondered what's actually happening in the brain when someone develops schizophrenia? Scientists have uncovered fascinating links between our genes and brain chemistry that help explain this complex mental health condition.
1
of 2
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Biological Explanations for Schizophrenia
Your family tree might hold more clues about mental health than you'd expect. Genetic explanations for schizophrenia show some pretty striking patterns when researchers study families.
Gottesman's family studies revealed that having two parents with schizophrenia gives you a 46% concordance rate - basically, nearly half of these children develop the condition too. With one affected parent, that drops to 13%, and siblings have about a 9% chance.
Twin studies make the genetic link even clearer. Identical twins (who share 100% of their DNA) have a 40% concordance rate, whilst fraternal twins (sharing 50% of DNA) only show 7%. That's a massive difference that screams genetics.
The dopamine hypothesis offers another piece of the puzzle. Scientists reckon that too much dopamine in certain brain regions triggers the positive symptoms of schizophrenia - like hallucinations and delusions. Brain scans actually show elevated dopamine levels in affected individuals.
Key Insight: The revised dopamine hypothesis is more nuanced - excess dopamine causes positive symptoms, but a deficit in the prefrontal cortex might explain negative symptoms like social withdrawal.
2
of 2Sign up to see the content. It's free!
- Access to all documents
- Improve your grades
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By signing up you accept Terms of Service and Privacy Policy
Evaluation and Evidence
Here's where things get really interesting - the research actually backs up these biological theories quite well. Ripke's massive study found 108 gene variations that bump up your schizophrenia risk, showing there's definitely a genetic component at play.
But here's the catch: even identical twins don't have a 100% concordance rate. This tells us that whilst genetic vulnerability matters loads, it's not the whole story - environmental factors must play a role too.
The dopamine research gets solid support from drug studies. Antipsychotic medications that reduce dopamine activity genuinely help schizophrenia patients, which is pretty strong evidence that dopamine levels are involved. Plus, many of those genetic variations researchers found actually affect dopamine production and receptors.
However, critics argue this approach might be guilty of biological reductionism - basically, oversimplifying a complex condition by focusing only on biology whilst ignoring psychological and social factors.
Remember: These biological explanations are brilliant for understanding the 'how' of schizophrenia, but they work best when combined with other approaches that consider life experiences and social context.
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