Temperament: Early Developing Personality Traits

activity Adaptability adjustment Adoption adult analysis anger appear approach arousal assessed attention average become behavior behavioral genetic biological Carey causes Chapter Chess child childhood classical conditioning component concept consisted continuity differential difficult dimensions direction distress early easy effects emotional emotionality environment environmental especially evidence example expect experience factor fear fraternal twin genetic genetic influence heritability identical important includes individual differences infants influence inherited initial intensity interaction involve issue later least less means measures ment months mother nine NYLS observed occur origin pairs parental rating parents personality traits play Plomin predict prefer present problems Questionnaire ratings reaction reasons relationship reported response rewards scale scores seeking selection shared shyness similar situations sociability specific stability stranger suggest Table temperament tend theory Thomas tion twin correlations variance yield