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Appears in Collections:Psychology Journal Articles
Peer Review Status: Refereed
Title: Hippocampus, delay discounting, and vicarious trial-and-error
Authors: Bett, David
Murdoch, Lauren H
Wood, Emma R
Dudchenko, Paul
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Keywords: Decision making
temporal discounting
Issue Date: May-2015
Publisher: Wiley-Blackwell
Citation: Bett D, Murdoch LH, Wood ER & Dudchenko P (2015) Hippocampus, delay discounting, and vicarious trial-and-error, Hippocampus, 25 (5), pp. 643-654.
Abstract: In decision-making, an immediate reward is usually preferred to a delayed reward, even if the latter is larger. We tested whether the hippocampus is necessary for this form of temporal discounting, and for vicarious trial-and-error at the decision point. Rats were trained on a recently developed, adjustable delay-discounting task (Papale et al., Cogn Affect Behav Neurosci 2012; 12: 513-526), which featured a choice between a small, nearly immediate reward, and a larger, delayed reward. Rats then received either hippocampus or sham lesions. Animals with hippocampus lesions adjusted the delay for the larger reward to a level similar to that of sham-lesioned animals, suggesting a similar valuation capacity. However, the hippocampus lesion group spent significantly longer investigating the small and large rewards in the first part of the sessions, and were less sensitive to changes in the amount of reward in the large reward maze arm. Both sham- and hippocampus-lesioned rats showed a greater amount of vicarious trial-and-error on trials in which the delay was adjusted. In a non-adjusting version of the delay discounting task, animals with hippocampus lesions showed more variability in their preference for a larger reward that was delayed by 10 s compared to sham-lesioned animals. To verify the lesion behaviorally, rat were subsequently trained on a water maze task, and rats with hippocampus lesions were significantly impaired compared to sham-lesioned animals. The findings on the delay discounting tasks suggest that damage to the hippocampus may impair the detection of reward magnitude.
Type: Journal Article
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Rights: This item has been embargoed for a period. During the embargo please use the Request a Copy feature at the foot of the Repository record to request a copy directly from the author. You can only request a copy if you wish to use this work for your own research or private study. This is the peer reviewed version of the following article: Bett D, Murdoch LH, Wood ER & Dudchenko P (2015) Hippocampus, delay discounting, and vicarious trial-and-error, Hippocampus, 25 (5), pp. 643-654, which has been published in final form at This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.
Affiliation: Psychology
University of Edinburgh
University of Edinburgh

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