Functional Relationships between the Hippocampus and Dorsomedial Striatum in Learning a Visual Scene-Based Memory Task in Rats
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Delcasso-2014-Functional relations.pdf
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Author(s)
Delcasso, Sebastien
Huh, Namjung
Byeon, Jung Seop
Lee, Jihyun
Jung, Min Whan
Lee, Inah
Date Issued
November 2014
Journal
Journal of Neuroscience
Publisher
Society for Neuroscience
Citation
Delcasso, S., N. Huh, J. S. Byeon, J. Lee, M. W. Jung, and I. Lee. “Functional Relationships Between the Hippocampus and Dorsomedial Striatum in Learning a Visual Scene-Based Memory Task in Rats.” Journal of Neuroscience 34, no. 47 (November 19, 2014): 15534–15547.
Version
Final published version
Abstract
The hippocampus is important for contextual behavior, and the striatum plays key roles in decision making. When studying the functional relationships with the hippocampus, prior studies have focused mostly on the dorsolateral striatum (DLS), emphasizing the antagonistic relationships between the hippocampus and DLS in spatial versus response learning. By contrast, the functional relationships between the dorsomedial striatum (DMS) and hippocampus are relatively unknown. The current study reports that lesions to both the hippocampus and DMS profoundly impaired performance of rats in a visual scene-based memory task in which the animals were required to make a choice response by using visual scenes displayed in the background. Analysis of simultaneous recordings of local field potentials revealed that the gamma oscillatory power was higher in the DMS, but not in CA1, when the rat performed the task using familiar scenes than novel ones. In addition, the CA1-DMS networks increased coherence at γ, but not at θ, rhythm as the rat mastered the task. At the single-unit level, the neuronal populations in CA1 and DMS showed differential firing patterns when responses were made using familiar visual scenes than novel ones. Such learning-dependent firing patterns were observed earlier in the DMS than in CA1 before the rat made choice responses. The present findings suggest that both the hippocampus and DMS process memory representations for visual scenes in parallel with different time courses and that flexible choice action using background visual scenes requires coordinated operations of the hippocampus and DMS at γ frequencies.
MIT Department
McGovern Institute for Brain Research at MIT
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1523/JNEUROSCI.0622-14.2014
