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Place cells can flexibly terminate and develop their spatial firing. A new theory for their function
1Department of Physiology and Pharmacology, State University of New York, Health Science Center at Brooklyn, 11203, USA. ludvin10@bmec.hcsbklyn.edu
Physiology & Behavior
|August 27, 1999
Summary
Place cells in the hippocampus flexibly change their spatial firing patterns over time. Even in a stable environment, these cells can stop or start encoding specific locations during prolonged exploration.
Area of Science:
- Neuroscience
- Cognitive Neuroscience
- Cellular Neuroscience
Background:
- Hippocampal place cells are crucial for spatial navigation and memory.
- Previous research typically used short-term exposure to environments.
Purpose of the Study:
- To investigate place cell activity during prolonged, continuous exploration of a fixed environment.
- To explore the dynamic nature of place cell spatial firing.
Main Methods:
- Continuous monitoring of CA1 and CA3 hippocampal place cell firing in rats.
- Utilized a novel behavioral paradigm involving extended (8-24 h) exposure to a single environment.
Main Results:
- Place cells ceased location-specific firing within 2-12 hours, despite continued exploration and stable EEG.
- Some cells initially lacking spatial selectivity developed it over 3-12 hours.
- Demonstrated flexible termination and development of place cell spatial firing.
Conclusions:
- Prolonged environmental exploration induces dynamic changes in hippocampal place cell activity.
- A new theory suggests place cells may create transient engrams in the association cortex.
- Place cells may suspend firing in established fields to process new spatial information.