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Personality Traits in Twins
Sowe Aspects of Cognitive Function in Twins
Physiological Measures in Twins
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alike anxiety/neuroticism arousal modulation autonomic barbiturate behaviour Behaviour Genetics biological Brit Chapman Test Chapter characteristics Claridge cold pressor comparison of MZ conceptual thinking CORRELATIONS AND F-RATIOS Creativity tests described difference between MZ discordant divergent thinking tests drug drug tolerance DZ pairs DZ samples DZ twins environmental evidence extraversion Eysenck factor scores genetic factors GORDON CLARIDGE Gottschaldt Figures heart rate heredity influence intelligence intra-pair difference intraclass correlations introverts investigation method monozygotic MZ and DZ nervous types neurotic neuroticism Number of pairs obtained overinclusion personality dimensions present study principal components analysis procedure Progressive Matrices Psychol psychophysiological psychoticism questionnaire relationships Scale schizophrenic sedation threshold separation shown in Table significant difference skin potential sociability spiral after-effect suggested theoretical tonic arousal total number traits twin method twin pairs twin sample twin studies types of twin Vandenberg variables within-pair variances Word Association zygosity