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Tuning in the Hippocampal Theta Band In Vitro: Methodologies for Recording from the Isolated Rodent Septohippocampal Circuit
Published on: August 2, 2017
Rat hippocampal theta rhythm during sensory mismatch
1System Emotional Science, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, Sugitani, Toyama, Japan.
Hippocampus
|October 30, 2008
Summary
Sensory mismatch, a potential cause of motion sickness, was studied in rats. Increased theta waves in the hippocampal formation during sensory conflict suggest its role in detecting mismatch and potentially inducing motion sickness.
Area of Science:
- Neuroscience
- Neurophysiology
Background:
- Sensory mismatch is hypothesized to cause motion sickness.
- The precise neural mechanisms underlying motion sickness remain poorly understood.
Purpose of the Study:
- To investigate the neural mechanisms of motion sickness induced by sensory mismatch.
- To examine the role of theta waves in the hippocampal formation (HF) during sensory conflict.
Main Methods:
- Awake rats were subjected to sensory mismatch using backward translocation on a treadmill.
- Local field potentials, specifically theta waves (6-9 Hz), were recorded from the dentate gyrus in the HF.
- Theta power was compared between a forward (congruent sensory) condition and a backward (mismatch) condition.
Main Results:
- Theta power in the HF significantly increased during the backward (sensory mismatch) condition compared to the forward condition.
- Repeated exposure to the backward condition led to a gradual decrease in theta power.
- Backward translocation without concurrent locomotion did not elevate HF theta power.
Conclusions:
- The hippocampal formation (HF) may function as a neural comparator, detecting sensory conflicts.
- Altered hippocampal theta activity is implicated in the induction of motion sickness.
