Abstract
Background
Cocaine use disorders (CUDs) have been associated with increased risk-taking behavior.
Neuroimaging studies have suggested that altered activity in reward and decision-making
circuitry may underlie cocaine users’ heightened risk-taking. It remains unclear if
this behavior is driven by greater reward salience, lack of appreciation of danger,
or another deficit in risk-related processing.
Methods
Twenty-nine CUD participants and 40 healthy comparison participants completed the
Risky Gains Task during a functional magnetic resonance imaging scan. During the Risky
Gains Task, participants choose between a safe option for a small, guaranteed monetary
reward and risky options with larger rewards but also the chance to lose money. Frequency
of risky choice overall and following a win versus a loss were compared. Neural activity
during the decision and outcome phases was examined using linear mixed effects models.
Results
Although the groups did not differ in overall risk-taking frequency, the CUD group
chose a risky option more often following a loss. Neuroimaging analyses revealed that
the comparison group showed increasing activity in the bilateral ventral striatum
as they chose higher value, risky options, but the CUD group failed to show this increase.
During the outcome phase, the CUD group showed a greater decrease in bilateral striatal
activity relative to the comparison group when losing the large amount, and this response
was correlated with risk-taking frequency after a loss.
Conclusions
The brains of CUD individuals are hypersensitive to losses, leading to increased risk-taking
behaviors, and this may help explain why these individuals take drugs despite aversive
outcomes.
Keywords
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Article info
Publication history
Published online: February 24, 2016
Accepted:
February 2,
2016
Received in revised form:
February 2,
2016
Received:
October 1,
2015
Identification
Copyright
Published by Elsevier Inc. on behalf of Society of Biological Psychiatry.