Reduced behavioral and neural activation in stimulant users to different error rates during decision making.
BACKGROUND
Behavioral processes and neural systems dysfunctions that put individuals at risk for drug use in general, and stimulant use in particular, are poorly understood. Here, the hypothesis is examined that stimulant-using subjects adjust their decision making less as a function of errors as evidenced by attenuated behavioral and neural substrate activation patterns.


METHODS
Twelve young adults who had used stimulants were compared with 12 education-matched, stimulant-naive comparison subjects. Subjects completed the two-choice prediction task with three fixed error-rate conditions (20%, 50%, or 80% errors) during functional magnetic resonance imaging.


RESULTS
Stimulant users relative to comparison subjects showed less strategy adjustment to different error rates, for example, they were less likely to stay with winning responses (win-stay) and to shift away from losing responses (lose-shift). These subjects also showed different activation patterns as a function of error rate in left insular and bilateral dorsolateral prefrontal cortex but not anterior cingulate. The degree to which individuals adjusted switching rate, or win-stay/lose-shift consistent responses, as a function of errors was correlated with the difference in insular cortex activation differences between high and low error rates.


CONCLUSIONS
The behavior of stimulant users is less adaptive to the frequency of errors made and fewer brain processing resources are deployed during decision making to anticipate erroneous performance. These findings could be markers for the predisposition of drug taking; however, their relevance for development of drug dependence requires further study.
Paulus
Martin P
MP
Laboratory of Biological Dynamics and Theoretical Medicine, Department of Psychiatry, University of California, San Diego, California, USA. mpaulus@ucsd.edu
Lovero
Kathryn L
KL
Wittmann
Marc
M
Leland
David S
DS
D000293:Adolescent; D000328:Adult; D000704:Analysis of Variance; D001921:Brain / Q000098:blood supply / Q000187:drug effects; D001931:Brain Mapping; D016022:Case-Control Studies; D000697:Central Nervous System Stimulants / Q000009:adverse effects*; D003657:Decision Making / Q000502:physiology*; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods; D008279:Magnetic Resonance Imaging / Q000379:methods; D008297:Male; D009483:Neuropsychological Tests; D010100:Oxygen / Q000097:blood; D011930:Reaction Time / Q000187:drug effects / Q000502:physiology*; D019966:Substance-Related Disorders / Q000378:metabolism / Q000473:pathology / Q000503:physiopathology*
D000697:Central Nervous System Stimulants; D010100:Oxygen