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Replicable patterns of causal information flow between hippocampus and prefrontal cortex during spatial navigation
Anup Das1, Vinod Menon1,2,3
1Department of Psychiatry and Behavioral Sciences, Stanford University School of Medicine, Stanford, CA 94305, USA.
Cerebral Cortex (New York, N.Y. : 1991)
|February 9, 2022
Summary
The human brain shows a consistent information flow from the hippocampus to the prefrontal cortex (PFC) during memory tasks. This frequency-dependent feedback loop is crucial for memory formation across different domains.
Area of Science:
- Neuroscience
- Cognitive Science
Background:
- The hippocampus and prefrontal cortex (PFC) are critical for spatial navigation and episodic memory.
- The causal flow of information between these regions across different tasks remains unclear.
Purpose of the Study:
- To investigate the directionality and frequency specificity of information flow between the hippocampus and PFC.
- To examine the replicability of these information flow patterns across spatial and verbal memory domains.
Main Methods:
- Intracranial EEG recordings were used in human participants.
- Spectrally resolved phase transfer entropy analyzed information flow.
- Bayesian analysis assessed the replicability of findings.
Main Results:
- A dominant information flow from the hippocampus to the lateral PFC was observed.
- This asymmetric flow was specific to memory encoding and recall periods.
- Hippocampus-to-PFC flow was prominent in the delta-theta bands, while PFC-to-hippocampus flow was stronger in the beta band.
Conclusions:
- A domain-independent and replicable frequency-dependent feedback loop exists between the hippocampus and PFC during memory formation.
- These findings elucidate the neural mechanisms underlying memory processing in the human brain.
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