http://www.springerlink.com/content/r6163q4527278820/
Abstract
Impulsivity
is characterized in part by heightened sensitivity to immediate
relative to future rewards. Although previous
research has suggested that “high discounters” in
intertemporal choice tasks tend to prefer immediate over future rewards
because they devalue the latter, it remains possible that
they instead overvalue immediate rewards. To investigate this question,
we recorded the reward positivity, a component of the
event-related brain potential (ERP) associated with reward processing,
with participants engaged in a task in which they received
both immediate and future rewards and nonrewards. The participants
also completed a temporal discounting task without ERP
recording. We found that immediate but not future rewards elicited
the reward positivity. High discounters also produced larger
reward positivities to immediate rewards than did low discounters,
indicating that high discounters relatively overvalued
immediate rewards. These findings suggest that high discounters may
be more motivated than low discounters to work for monetary
rewards, irrespective of the time of arrival of the incentives.
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