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This study sought to test if trait levels of impulsivity were related in a nonmonotonic manner to success on a laboratory task of impulsivity. Participants completed the MMPI-2-RF, a self-report measure of psychopathology, and the Angling Risk Task (ART), a laboratory measure of impulsivity. Variables of interest were T-scores on the MMPI-2-RF scale Behavioral/Externalizing Dysfunction (BXD) and total money earned on the ART, which was conceptualized as a measure of success on the task. After screening, the sample consisted of 173 undergraduate students. The findings showed no evidence to support a nonmonotonic relationship between BXD scores and success on the Angling Risk Task when tested by (1) polynomial regression, and (2) the two lines test, a procedure recently developed to detect nonmonotonicity. Results do not support the hypothesis of an optimal level of impulsivity, at least in a nonclinical population and with a laboratory operationalization of impulsivity. Future studies should examine this question in samples with greater variability and using more consequential operationalizations of impulsivity.

cogent psychology

Examining the bipolarity of the Minnesota multiphasic personality inventory-2-restructured form (MMPI-2-RF) behavioral / externalizing dysfunction (BXD) scale using a laboratory measure of impulsivity