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Anticipatory activity in rat medial prefrontal cortex during a working memory task.
Wenwen Bai1, Tiaotiao Liu, Hu Yi
1School of Biomedical Engineering, Tianjin Medical University, Tianjin 300070, China.
Neuroscience Bulletin
|December 11, 2012
Summary
Neuronal ensembles in the rat prefrontal cortex show anticipatory activity during working memory tasks. This neural firing pattern may be key to how the brain encodes working memory events.
Area of Science:
- Neuroscience
- Cognitive Science
Background:
- Working memory is essential for cognitive function.
- The prefrontal cortex is critical for working memory processes.
Purpose of the Study:
- To investigate prefrontal cortex neuronal firing patterns during a working memory task in rats.
- To understand how neuronal ensembles encode working memory events.
Main Methods:
- Rats were trained on a Y-maze working memory task.
- Neuronal population activity was recorded from the prefrontal cortex using microelectrode arrays.
- Spatio-temporal action potential trains were analyzed.
Main Results:
- Neurons exhibited increased firing rates and ensemble activity during the task.
- Anticipatory neural activity correlated with upcoming choices in correct trials.
- Pre-event firing rates were significantly higher than post-event rates in correct trials (P<0.05).
Conclusions:
- Anticipatory activity in prefrontal cortex neuronal ensembles appears to be involved in working memory encoding.
- This finding sheds light on the neural mechanisms of working memory.
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