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The postsubiculum is necessary for spatial alternation but not for homing by path integration
David Bett1, Emma R Wood, Paul A Dudchenko
1School of Natural Sciences, University of Stirling, Stirling FK9 4LA, United Kingdom.
Behavioral Neuroscience
|February 23, 2012
Summary
The postsubiculum is not essential for homing using path integration in rats. However, postsubiculum lesions impaired performance on tasks requiring memory and avoiding previously visited locations.
Area of Science:
- Neuroscience
- Cognitive Neuroscience
- Spatial Navigation
Background:
- The postsubiculum is a brain region implicated in spatial navigation, containing cells crucial for orientation (head direction cells, grid cells, border cells).
- Its projections to the hippocampal formation suggest a role in spatial memory and navigation.
Purpose of the Study:
- To investigate the necessity of the postsubiculum for homing behavior mediated by path integration.
- To determine if the postsubiculum plays a role in spatial memory and the avoidance of previously visited locations.
Main Methods:
- Rats were trained on a circular platform homing task.
- Postsubiculum lesions were induced using ibotenic acid in one group, while a control group underwent sham surgery.
- Performance was assessed on the homing task and a delayed alternation T-maze task.
Main Results:
- Rats with postsubiculum lesions exhibited normal homing accuracy compared to control animals.
- Lesioned animals showed significant deficits in the delayed alternation T-maze task at various delay intervals (5, 30, 60 seconds).
Conclusions:
- The postsubiculum is not required for homing guided by path integration.
- The postsubiculum is critical for spatial memory and the ability to avoid previously visited locations.
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