Supplemental Material for Winning and Losing: Effects on Impulsive Action

Abstract

Winning and losing: Effects on impulsive actionIndividual differences in choice RT.Choice RT was shorter for trials on which subjects selected non-gamble (M = 706 ms, SD = 223) than for trials on which subjects selected the gamble option (M = 738 ms, SD = 248), t(179) = 3.650, p < .001,gav = 0.132.However, we observed large individual differences.For each subject, we calculated a normalized RT difference score: (choice RT gamble minus choice RT non-gamble)/(choice RT non-gamble).Thus, a negative score indicates that the subject selects the gamble proportionally faster than the non-gamble.As can be seen in Figure S1, selecting the gamble took longer than selecting the non-gamble for many subjects (i.e.many data points are above the horizontal dashed line).Interestingly, this latency difference correlated strongly with overall p(gamble): the less subjects gambled, the longer it took them to select the gamble compared with selecting the non-gamble, r(179) = -.62, p < .001(coefficient robust regression: value = -0.4202,standard error = 0.0391, t(178) = 10.742).

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