Sex modulates approach systems and impulsivity in substance dependence |
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Authors: | Robert I Perry Theodore Krmpotich Laetitia L Thompson Susan K Mikulich-Gilbertson Marie T Banich Jody Tanabe |
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Institution: | 1. University of Colorado School of Medicine, Department of Radiology, 12700 E. 19th Avenue, Mailstop C278, Aurora, CO 80045, USA;2. University of Colorado School of Medicine, Department of Psychiatry, 13001 E. 17th Place, Mail Stop F546, Aurora, CO 80045, USA;3. University of Colorado at Boulder, D420 Muenziger Building, Campus Box 345, Boulder, CO 80309, USA |
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Abstract: | BackgroundPersonality traits such as pathological engagement in approach behaviors, high levels of impulsivity and heightened negative affect are consistently observed in substance dependent individuals (SDI). The clinical course of addiction has been shown to differ between sexes. For example, women increase their rates of consumption of some drugs of abuse more quickly than men. Despite the potential influence of personality and sex on features of addiction, few studies have investigated the interaction of these factors in substance dependence.MethodsFifty-one SDI (26 males, 25 females) and 66 controls (41 males, 25 females) completed the Behavioral Inhibition/Behavioral Activation System (BIS/BAS) Scales, the Barratt Impulsiveness Scale, and the Positive and Negative Affect Schedule (PANAS-X). Data were analyzed with 2 × 2 ANCOVAs testing for main effects of group, sex and group by sex interactions, adjusting for education level.ResultsSignificant group by sex interactions were observed for BAS scores F(1,116) = 7.03, p < .01] and Barratt Motor Impulsiveness F(1,116) = 6.11, p < .02] with female SDI showing the highest approach tendencies and impulsivity followed by male SDI, male controls, and finally female controls. SDI scored higher on negative affect F(1,116) = 25.23, p < .001] than controls. Behavioral Inhibition System scores were higher in women than men F(1,116) = 14.03, p < .001].ConclusionHigher BAS and motor impulsivity in SDI women relative to SDI men and control women suggest that personality traits that have been previously associated with drug use may be modulated by sex. These factors may contribute to differences in the disease course observed in male compared to female drug users. |
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Keywords: | Substance dependence Sex Impulsivity Approach systems Affect |
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