Biological Bases (Dec. 1, 2010)

Coefficient h rmza 2 2r h dza 2 h 2rmz rdz 2

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Unformatted text preview: dza 2 h = 2(rmz – rdz) 2 Heritability Heritability Coefficient Applies only to groups, not individuals Varies from population to population, and over time Valid only if measures used to calculate it are valid Heritability Heritability Coefficient Applies only to groups, not individuals Varies from population to population, and over time Valid only if measures used to calculate it are valid Thomas, Thomas, Chess & Birch (1970) Level of motor activity Positive response to new object Regularity in biological functions Friendliness or good mood Adapts to changes in environment Usual degree of energy in responding Thomas, Thomas, Chess & Birch (1970) Easy Difficult Regular rhythms Irregular rhythms Good mood Poor mood Accepts novelty Dislikes novelty Adapts well to change Low to moderate levels of energy Adapts poorly to change High levels of energy Plomin Plomin & Rowe (1979) Studied social development of male and female twin pairs, MZ and DZ Looking at Stranger MZ DZ .70 .50 .30 .10 Approaching Stranger Nearness to Stranger Vocalizing to Stranger Buss Buss & Plomin (1984) Emotionality A...
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This note was uploaded on 05/11/2012 for the course PSYCH 2b03 taught by Professor Dickday during the Spring '12 term at McMaster University.

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