Biological Bases (Dec. 1, 2010)

70 50 30 10 emotionality dz activity sociability why

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Unformatted text preview: ctivity Sociability Buss Buss & Plomin (1984) MZ .70 .50 .30 .10 Emotionality DZ Activity Sociability Why Why a Contrast Effect? Non‐additive Variance: Same Locus Dominant‐recessive effects: Other Loci Epistatic effects: Why Why a Contrast Effect? Epigenetic effects? Chemical instructions for gene expression M Differentiates cell types in organs Affected by environment and experience Passed on to offspring Methylation Epigenetic Epigenetic Effects? Epigenome: Chemical instructions for gene expression Methylation Differentiate different cell types in different organs Affected by environment and experience Passed on to offspring Why Why a Contrast Effect? Environments not equal: Contrast effects in DZ twins: Assimilation effects in MZ twins: Distribution Distribution of Inhibition 20% 20% Uninhibited Uninhibited 10% Inhibited 70% 70% Middling Middling Behaviorally Behaviorally Inhibited Children Slow to start conversation with unfamiliar adult or peer Seldom smile spontaneously with unfamiliar other Slow to relax in unfamiliar situations Memory impaired following stress Cautious decision makers Unusual fears or phobias Physiology Physiology of Inhibited Children HR up during stress, or when stand up Diastolic BP up when stand up Pupillary dilation u...
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