Document Detail

Limbic system structures differentially contribute to exploratory trip organization of the rat.
MedLine Citation:
PMID:  23034954     Owner:  NLM     Status:  Publisher    
The role of limbic system structures in spatial orientation continues to be debated. The hippocampus (HPC) has been implicated in encoding symbolic representations of environments (i.e., cognitive map), whereas entorhinal cortex (EC) function has been implicated in self-movement cue processing (i.e., dead reckoning). These distinctions largely depend on the electrophysiological characteristics of cells within these regions and behavioral tasks that typically fail to dissociate environmental and self-movement cue processing. Topographic and kinematic characteristics of exploratory trip organization have been shown to differentially depend on environmental and self-movement cue processing. The present study examines the effects of either HPC or EC lesions on exploratory trip organization under varying lighting conditions. HPC lesions selectively impaired all measures of performance under dark conditions, but spared all measures of performance under light conditions. EC lesions impaired kinematic measures related to distance estimation under all conditions and impaired all measures of performance under light conditions. These results provide evidence that the HPC is involved in processing self-movement cues but not environmental cues, and EC is involved in processing distance estimates generated from either self-movement or environmental cues. These observations provide further support for serial processing of self-movement cues through limbic system structures that converge on the HPC. © 2012 Wiley Periodicals, Inc.
Shawn S Winter; Jenny R Köppen; Tialia B N Ebert; Douglas G Wallace
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-10-4
Journal Detail:
Title:  Hippocampus     Volume:  -     ISSN:  1098-1063     ISO Abbreviation:  Hippocampus     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-10-4     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9108167     Medline TA:  Hippocampus     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012 Wiley Periodicals, Inc.
Psychology Department, Northern Illinois University, DeKalb, Illinois; Psychology and Brain Science Department, Dartmouth College, Hanover, New Hampshire.
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