Gottesman- twin studies
Method: carried out meta-analysis of 40 twin studies.
Results: having identical twin gave 48% of having it too. 17% in non identical twins
Conclusion: Schiz. has strong genetic basis.
Evaluation: highe ecological validity --> carried out as field exp.
identical twins share 100% of genes --> both twins might suffer from same conditions.
fam. environment may play a big role --> identical twins treated more similarly than non identical twins.
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