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Causal theorie2

Causal theorie2 - Causal theories o Biological Genetics...

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Causal theories o Biological Genetics Having any relative with sz increases risk Risk of sx increased with genetic relatedness Greatest risk: MZ twin or both parents with sz Risk of sz increase with severity of sz in parent Risk is for spectrum of psychotic disorders If 1 identical twin (100% relatedness) has sz there is a 46% chance that the other twin will have sz Fraternal twins (50% relatedness) 14% chance The importance of unshared environments: Genain quads, identical quadruplets who all developed sz – they had the same environment and genes but their disorder differed in onset suggesting the important of personal experience Adoption studies – children of mom’s with sz who are adopted as newborns seem to range b/w 5-10% of them developing sz Markers – characteristics that occur in ppl with sz much more often than in ppl w/o sz but they are not symptoms o Ex: smooth eye-tracking – ability to hold head still and move eyes smoothly when tracking a moving object. Ppl
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