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Behavioral results. A, Ratio of impulsive (Now) choices as a function of subject group. The AA group made significantly more impulsive choices (0.74 > 0.26; *p = 0.002; t(17) = 3.56) than the CS group. Error bars denote SEM. A value of 0 represents always choosing Later over Now, whereas a value of 1 represents the converse. B, Standardized ICR for each subject in rank order. Units are in SDs, with mean equal to 0. ◇, AA; ◆, CS.
