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Individual differences in sensitivity and tolerance to alcohol.

Abstract Human responses to alcohol—especially sensitivity and acute behavioral tolerance—are being studied within a behavioral genetic design involving comparisons of scores from monozygotic twins, dizygotic twins, nontwin siblings, and unrelated (adoptee) pairs reared in the same family from infancy. The planned genetic analyses must await completion of data collection. The present sample is, however, adequate for analyses of means and for some analyses of individual differences in responses. For most of the measures being used, we find the usual mean decrement in performance after alcohol dosing to 0.100 BAC, but individual differences in response to alcohol are large, and a few individuals actually improve in performance after dosing. Also, on two tests, Cancellation and Block Rotations, there is a significant mean improvement in performance immediately after dosing. As yet we do not have a satisfactory explanation for this phenomenon. On most but not all of the tests, performance improves after the i...