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Encoding of action history in the rat ventral striatum.

Authors
Kim, YB; Huh, N; Lee, H; Baeg, EH; Lee, D; Jung, MW
Citation
Journal of neurophysiology, 98(6):3548-3556, 2007
Journal Title
Journal of neurophysiology
ISSN
0022-30771522-1598
Abstract
In a dynamic environment, animals need to update information about the rewards expected from their alternative actions continually to make optimal choices for its survival. Because the reward resulting from a given action can be substantially delayed, the process of linking a reward to its causative action would be facilitated by memory signals related to the animal's previous actions. Although the ventral striatum has been proposed to play a key role in updating the information about the rewards expected from specific actions, it is not known whether the signals related to previous actions exist in the ventral striatum. In the present study, we recorded neuronal ensemble activity in the rat ventral striatum during a visual discrimination task and investigated whether neuronal activity in the ventral striatum encoded signals related to animal's previous actions. The results show that many neurons modulated their activity according to the animal's goal choice in the previous trial, indicating that memory signals for previous actions are available in the ventral striatum. In contrast, few neurons conveyed signals on impending goal choice of the animal, suggesting the absence of decision signals in the ventral striatum. Memory signals for previous actions might contribute to the process of updating the estimates of rewards expected from alternative actions in the ventral striatum.
MeSH terms
AnimalsChoice Behavior/physiologyCuesData Interpretation, StatisticalDatabases, FactualDiscrimination (Psychology)/physiologyElectrophysiologyMaleMotivationNeostriatum/physiology*Psychomotor Performance/physiologyRatsRats, Sprague-DawleyRewardVisual Perception/physiology
DOI
10.1152/jn.00310.2007
PMID
17942629
Appears in Collections:
Journal Papers > Research Organization > Institute for Medical Sciences
Journal Papers > Research Organization > BK21
AJOU Authors
허, 남정정, 민환
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