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Separate Neural Systems Value Immediate and Delayed Monetary Rewards
Samuel M. McClure,1*David I. Laibson,2George Loewenstein,3Jonathan D. Cohen1,4
When humans are offered the choice between rewards availableat different points in time, the relative values of the optionsare discounted according to their expected delays until delivery.Using functional magnetic resonance imaging, we examined theneural correlates of time discounting while subjects made aseries of choices between monetary reward options that variedby delay to delivery. We demonstrate that two separate systemsare involved in such decisions. Parts of the limbic system associatedwith the midbrain dopamine system, including paralimbic cortex,are preferentially activated by decisions involving immediatelyavailable rewards. In contrast, regions of the lateral prefrontalcortex and posterior parietal cortex are engaged uniformly byintertemporal choices irrespective of delay. Furthermore, therelative engagement of the two systems is directly associatedwith subjects' choices, with greater relative fronto-parietalactivity when subjects choose longer term options.
1 Department of Psychology and Center for the Study of Brain, Mind, and Behavior, Princeton University, Princeton, NJ 08544, USA. 2 Department of Economics, Harvard University, and National Bureau of Economic Research, Cambridge, MA 02138, USA. 3 Department of Social and Decision Sciences, Carnegie Mellon University, Pittsburgh, PA 15213, USA. 4 Department of Psychiatry, University of Pittsburgh, Pittsburgh, PA 15260, USA.
* To whom correspondence should be addressed. E-mail: smcclure{at}princeton.edu
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George Ainslie and John Monterosso (15 October 2004) Science306 (5695), 421.
[DOI: 10.1126/science.1104884] |Summary »|Full Text »|PDF »
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