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Updated: May 10, 2026
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Published on: August 30, 2011
Prefrontal activity links nonoverlapping events in memory
Marieke R Gilmartin1, Hiroyuki Miyawaki, Fred J Helmstetter
1Department of Psychology, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin 53211, USA. marieke.gilmartin@gmail.com
Summary
Silencing medial prefrontal cortex (mPFC) neurons during trace fear conditioning (TFC) learning prevented memory formation. This suggests PL mPFC neurons bridge stimuli separated in time, supporting working memory.
Area of Science:
- Neuroscience
- Cognitive Neuroscience
- Behavioral Neuroscience
Background:
- The medial prefrontal cortex (mPFC) is crucial for memory functions.
- Neurons in the prelimbic (PL) region of the mPFC may support associative learning over time.
- Previous evidence for this role was primarily descriptive.
Purpose of the Study:
- To investigate the role of PL mPFC neurons in bridging temporally separated stimuli during learning.
- To test the hypothesis that PL mPFC activity is necessary for trace fear conditioning (TFC).
Main Methods:
- Optogenetic silencing of PL mPFC neurons in rats during the learning phase of TFC.
- Behavioral assessment of fear memory formation after cue-shock pairing.
Main Results:
- Silencing PL mPFC neurons specifically during the interval between the cue and the shock prevented memory formation.
- This demonstrates a causal role for PL mPFC activity during the inter-stimulus interval in TFC.
Conclusions:
- PL mPFC neurons exhibit a working memory function, bridging noncontiguous stimuli.
- This bridging activity is essential for learning associations in tasks like TFC.
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