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Tuning in the Hippocampal Theta Band In Vitro: Methodologies for Recording from the Isolated Rodent Septohippocampal Circuit

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Theta phase precession beyond the hippocampus.

Sushant Malhotra¹, Robert W A Cross, Matthijs A A van der Meer

¹Department of Biology, University of Waterloo, 200 University Ave. W, Waterloo, ON N2L 3G1 Ontario, Canada.

Reviews in the Neurosciences

|June 22, 2012

Summary

Theta phase precession, a neural timing mechanism, organizes cell activity in the brain. This review explores its role beyond the hippocampus, particularly in the ventral striatum, for understanding learning and navigation.

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Area of Science:

Neuroscience
Computational Neuroscience
Systems Neuroscience

Background:

Spike timing in the rodent hippocampal formation shows precise organization.
Theta phase precession, where cell spikes shift relative to theta oscillations, is observed in hippocampal place cells.
This phenomenon is linked to learning, navigation, and predictive processing.

Purpose of the Study:

To explore the implications of extrahippocampal phase precession.
To focus on phase precession in the ventral striatum (vStr) and its reward-anticipatory neurons.
To understand how phase precession in the vStr informs hippocampal-striatal interactions and associated behaviors.

Main Methods:

Review of existing literature on theta phase precession.
Analysis of phase precession in hippocampal and ventral striatal neuronal firing patterns.
Examination of behavioral paradigms involving hippocampus-vStr interactions.

Main Results:

Theta phase precession is not exclusive to the hippocampus, occurring in other brain structures.
Phase precession is systematically present in reward-anticipatory neurons of the ventral striatum.
This suggests a conserved neural mechanism across different brain regions.

Conclusions:

Extrahippocampal phase precession offers insights into neural processing in structures like the vStr.
Ventral striatal phase precession can elucidate behaviors such as conditioned place preference and reinstatement.
Phase precession serves as a valuable tool for dissecting functional connectivity between the hippocampus and its outputs.