The Long Shadow of Temperament
We have seen these children--the shy and the sociable, the cautious and the daring--and wondered what makes one avoid new experience and another avidly pursue it. At the crux of the issue surrounding the contribution of nature to development is the study that Jerome Kagan and his colleagues have been conducting for more than two decades. In The Long Shadow of Temperament, Kagan and Nancy Snidman summarize the results of this unique inquiry into human temperaments, one of the best-known longitudinal studies in developmental psychology. These results reveal how deeply certain fundamental temperamental biases can be preserved over development. Identifying two extreme temperamental types--inhibited and uninhibited in childhood, and high-reactive and low-reactive in very young babies--Kagan and his colleagues returned to these children as adolescents. Surprisingly, one of the temperaments revealed in infancy predicted a cautious, fearful personality in early childhood and a dour mood in adolescence. The other bias predicted a bold childhood personality and an exuberant, sanguine mood in adolescence. These personalities were matched by different biological properties. In a masterly summary of their wide-ranging exploration, Kagan and Snidman conclude that these two temperaments are the result of inherited biologies probably rooted in the differential excitability of particular brain structures. Though the authors appreciate that temperamental tendencies can be modified by experience, this compelling work--an empirical and conceptual tour-de-force--shows how long the shadow of temperament is cast over psychological development.
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adolescents adults amygdala amygdalar activity animals asymmetry aversive behavior beta power brain stem Caucasian chi-square chil child cognitive combined conditioned stimulus correlation corrugator activity cortical cortisol described discrepant displayed dopamine dren electric shock emotional event-related potential examiner experience fear fMRI genes greater heart rate high-reactive boys high-reactive girls high-reactive infants human hypothalamus inferior colliculus inhibited Kagan laboratory left frontal activation low-reactive boys low-reactive infants magnitude measures monkeys mothers msec neurons norepinephrine novel invalid oddball panic disorder parents percent of high-reactives percent of low-reactives person potentiated startle prefrontal cortex psychological Q-sort rats reaction reactives receptors relation response right frontal activation sample scientists scores semantic semantic network showed shyness smiles snakes social spontaneous standard score strangers subdued sympathetic temperament temperamental bias temperamental groups tercile thalamus tion traits uncertainty unfamiliar events uninhibited children unpleasant variables variation Wave 5 values wave form
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