· Joseph (2004) MZ 40.4% concordance rates in depression, 7.4% in DZ, suggesting a partially genetic basis
· Tienari et al (2000) adopted children with schizophrenic mothers are more likely to develop schizophrenia (is this due to genetics are emotionally flat mothers?)
· Gottesman and Reilly (2003) Diathesis – stress model – genes predispose the disorder, develops after stressor
· Due to common rearing practices not genes
· When blind tests are conducted concordance rates are lower
· May be due to an identity crisis for MZ twins, means experiences are similar – Joseph (2004)
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