Causes of Schizophrenia

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Joseph (2004)
concordance rates for schizophrenia between DZ twins 7% and MZ twins 40%- if it was solely genetics we should see much higher concordance rates for MZ twins
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Rosenthal (1963)
quadruplets study- all had schizophrenia (must be something to do with genetics), but different severities and different ages so not 100%- ignores environmental causes, poor home life parents had depression etc.
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Tienari (2000)
adoption studies- adopted children whose birth mother has schizophrenia have 6% chance of getting it, but this number was reduced if they were raised by a supportive family- CG had 2% of getting it even without schizophrenic moms
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Sterling and Hellewell (1999)
schizophrenic behaviour is not similar to infantile behaviour (argument against Freud)
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Bateson (1956)
double bind theory- parents of schizophrenics communicate destructively e.g. angrily shouting 'I love you'- however this theory has little evidence to support it
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Berger (1965)
double bind theory- schizophrenics have a high recall of their parents acting in a double bind way- however this could be susceptible to social desirability bias
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Kavanagh (1992)
interpersonal communication- schizophrenics are more likely to relapse in families with low emotional expression because they need support and stability- this is about recovery not how it is caused
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Day et al (1987)
schizophrenics suffer from more stressful life events- cause and effect? maybe schizophrenics can't cope with mildly stressful life events like everyone else, maybe schizophrenia causes them to have more stress
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Card 2

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quadruplets study- all had schizophrenia (must be something to do with genetics), but different severities and different ages so not 100%- ignores environmental causes, poor home life parents had depression etc.

Back

Rosenthal (1963)

Card 3

Front

adoption studies- adopted children whose birth mother has schizophrenia have 6% chance of getting it, but this number was reduced if they were raised by a supportive family- CG had 2% of getting it even without schizophrenic moms

Back

Preview of the back of card 3

Card 4

Front

schizophrenic behaviour is not similar to infantile behaviour (argument against Freud)

Back

Preview of the back of card 4

Card 5

Front

double bind theory- parents of schizophrenics communicate destructively e.g. angrily shouting 'I love you'- however this theory has little evidence to support it

Back

Preview of the back of card 5
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