Classification and Diagnosis of Schizophrenia

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  • Created by: AHalls
  • Created on: 14-12-20 17:08

Positive Symptoms

- an addition to experiences beyond those of ordinary existence

- hallucinations and delusions 

Negative Symptoms 

- loss of usual abilities and experiences 

- avolition and speech poverty

Key issues in diagnosing schizophrenia 

- Reliability, Validity, Co-Morbidity, Symptom Overlap

Outline Gottesman's research:

Gottesman studied the genetic basis for schizophrenia and found that monozygotic twins have a 48% concordance rate of schizophrenia, while dizygotic twins have a concordance rate of 17%. This suggests that while there is a genetic basis for schizophrenia, there is also evidence that the environment also plays a role in the development of schizophrenia. 

Outline Ripkes' research:

Ripkes found that there was no single gene that was responsible for schizophrenia, and instead found a collection of 108 genes that could be responsible for the development of schizophrenia. The majority of these genes are linked to dopamine sensitivity.

Limitation of biological explanations

- diathesis-stress model shows evidence of…

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