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A stable home-base promotes allocentric memory representations of episodic-like everyday spatial memory.
Nicola Broadbent1, Lucas Berend Lumeij2, Marta Corcoles2
1Dart Neuroscience, San Diego, Edinburgh, UK.
The European Journal of Neuroscience
|January 17, 2020
Summary
Researchers explored how rats remember locations, finding that a stable home-base training method promotes egocentric (body-centered) spatial memory over allocentric (map-like) memory. This impacts how memory traces are encoded and recalled.
Area of Science:
- Neurobiology
- Cognitive Science
- Animal Behavior
Background:
- Episodic-like memory research hinges on understanding spatial frames of reference (allocentric vs. egocentric).
- Previous studies often assumed specific protocols favored one representation, but ambiguity exists.
- Testing memory representation strategies is not routinely performed.
Purpose of the Study:
- To investigate the spatial coding strategies used in episodic-like memory in rats.
- To determine if modified training protocols can promote allocentric encoding.
- To clarify the ambiguity in representational frames of reference in memory studies.
Main Methods:
- Rats were trained in an 'action-where' encoding task in an event arena.
- Protocols were modified using multiple start locations or a stable home-base.
- Performance was assessed, including blocking external cues during recall.
Main Results:
- A protocol using multiple start locations showed ambiguity, favoring egocentric encoding.
- A stable home-base protocol resulted in excellent performance.
- The stable home-base performance was impaired by blocking external cues post-encoding, confirming allocentric encoding.
Conclusions:
- Standard protocols may favor egocentric encoding, contrary to assumptions.
- A stable home-base protocol effectively promotes allocentric spatial memory.
- Future neurobiological studies should consider egocentric path direction vs. allocentric path destination in memory recall.
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