The biological model assumes psychological disorders are physical illnesses
- Genetics - faulty genes are known to cause some diseases that have psychological effects e.g. huntingtons.
- Neurotransmitters - Too much or too little of particular neaurotransmitters may produce psychological disorders e.g. increased dopamine leads to schizophrenia and drugs can cause this.
- Infection - Disorders may be caused by infection. General paresis is a condition involving delusions and mood swings, leading to paralysis and death. It is caused by syphilis and can now be treated.
- Brain Injury - Accidental brain damage may produce psychological disorders e.g. Phineas Gage developed impulsiveness and disorganisation, could not plan ahead and had a different personality.
Research has been done into the genetic basis of schizophrenia
Method: Carried out a meta analysis of approximately 40 twin studies
Results: It was found that having an identical twin with schizophrenia gave you a 48% chance of developing the condition. This reduced to 17% in non identical twins.
Conclusion: Schizophrenia has a strong genetic basis
Evaluation: It was a field study so had high ecological validity. Shows another factor can also be involved as only 50% developed the disorder. This may come down to…