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J Psychiatr Res. 2009 Aug;43(12):1057-63. doi: 10.1016/j.jpsychires.2009.03.003. Epub 2009 Apr 5.

Trait impulsivity and response inhibition in antisocial personality disorder.

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1
Department of Psychiatry and Behavioral Sciences, University of Texas Health Science Center, 1300 Moursund Street, Room 270, Houston, TX 77030, USA. Alan.C.Swann@uth.tmc.edu

Abstract

BACKGROUND:

Impulsive behavior is a prominent characteristic of antisocial personality disorder. Impulsivity is a complex construct, however, representing distinct domains of cognition and action. Leading models refer to impulsivity as an inability to evaluate a stimulus fully before responding to it (rapid-response impulsivity), and as an inability to delay responding despite a larger reward (reward-delay impulsivity). We investigated these models in terms of the diagnosis and severity of antisocial personality disorder.

METHODS:

Thirty-four male subjects on probation/parole who met DSM-IV criteria for ASPD, and 30 male healthy comparison subjects, matched by ethnicity, were recruited from the community. The Barratt Impulsiveness Scale (BIS-11) provided an integrated measure of trait impulsivity. Rapid-response impulsivity was assessed using the Immediate Memory Task (IMT), a continuous performance test. Reward delay impulsivity was assessed using the Two-choice Impulsivity Paradigm (TCIP), where subjects had the choice of smaller-sooner or larger-delayed rewards, and the Single Key Impulsivity Paradigm (SKIP), a free-operant responding task.

RESULTS:

Compared to controls, subjects with ASPD had higher BIS-11 scores (Effect Size (E.S.)=0.95). They had slower reaction times to IMT commission errors (E.S.=0.45). Correct detections, a measure of attention, were identical to controls. On the SKIP, they had a shorter maximum delay for reward (E.S.=0.76), but this was not significant after correction for age and education. The groups did not differ on impulsive choices on the TCIP (E.S.<0.1). On probit analysis with age and education as additional independent variables, BIS-11 score, IMT reaction time to a commission error, and IMT positive response bias contributed significantly to diagnosis of ASPD; SKIP delay for reward did not. Severity of ASPD, assessed by the number of ASPD symptoms endorsed on the SCID-II, correlated significantly with commission errors (impulsive responses) on the IMT, and with liberal IMT response bias. This relationship persisted with correction for age and education.

DISCUSSION:

These results suggest that ASPD is characterized by increased rapid-response impulsivity. Aspects of impulsivity related to reward-delay or attention appear relatively intact.

Comment in

PMID:
19345957
PMCID:
PMC2716408
DOI:
10.1016/j.jpsychires.2009.03.003
[Indexed for MEDLINE]
Free PMC Article
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