Ludvig, Elliot Andrew, Sutton, Richard S., Verbeek, Eric and Kehoe, E. James (2008) A computational model of hippocampal function in trace conditioning. In: Twenty-Second Annual Conference on Neural Information Processing Systems, Vancouver, Canada, 8-11 Dec 2008. Published in: Advances in Neural Information Processing Systems 21 ISBN 9781605609492.

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Abstract

We present a new reinforcement-learning model for the role of the hippocampus in classical conditioning, focusing on the differences between trace and delay conditioning. In the model, all stimuli are represented both as unindividuated wholes and as a series of temporal elements with varying delays. These two stimulus representations interact, producing different patterns of learning in trace and delay conditioning. The model proposes that hippocampal lesions eliminate long-latency temporal elements, but preserve short-latency temporal elements. For trace conditioning, with no contiguity between stimulus and reward, these long-latency temporal elements are vital to learning adaptively timed responses. For delay conditioning, in contrast, the continued presence of the stimulus supports conditioned responding, and the short-latency elements suppress responding early in the stimulus. In accord with the empirical data, simulated hippocampal damage impairs trace conditioning, but not delay conditioning, at medium-length intervals. With longer intervals, learning is impaired in both procedures, and, with shorter intervals, in neither. In addition, the model makes novel predictions about the response topography with extended stimuli or post-training lesions. These results demonstrate how temporal contiguity, as in delay conditioning, changes the timing problem faced by animals, rendering it both easier and less susceptible to disruption by hippocampal lesions.

Item Type:	Conference Item (Poster)
Subjects:	B Philosophy. Psychology. Religion > BF Psychology
Divisions:	Faculty of Science > Psychology
Library of Congress Subject Headings (LCSH):	Conditioned response, Hippocampus (Brain) -- Physiology, Reinforcement learning -- Computer simulation
Journal or Publication Title:	Advances in Neural Information Processing Systems 21
Publisher:	Curran Associates, Inc.
ISBN:	9781605609492
Official Date:	2008
Status:	Not Peer Reviewed
Access rights to Published version:	Restricted or Subscription Access
Conference Paper Type:	Poster
Title of Event:	Twenty-Second Annual Conference on Neural Information Processing Systems
Type of Event:	Conference
Location of Event:	Vancouver, Canada
Date(s) of Event:	8-11 Dec 2008
Related URLs:	Organisation Publisher

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