Specific Increase of Hippocampal Delta Oscillations Across Consecutive Treadmill Runs

Frontiers in Behavioral Neuroscience
Alan M B FurtunatoHindiael Belchior

Abstract

Running speed affects theta (6-10 Hz) oscillations, the most prominent rhythm in the rat hippocampus. Many reports have found a strong positive correlation between locomotion speed and the amplitude and frequency of theta oscillations. However, less is known about how other rhythms such as delta (0.5-4 Hz) and gamma (25-100 Hz) are affected, and how consecutive runs impact oscillatory activity in hippocampal networks. Here, we investigated whether the successive execution of short-term runs modulates local field potentials (LFPs) in the rat hippocampus. To do this, we trained Long-Evans rats to perform voluntary 15-s runs at 30 cm/s on a treadmill placed on the central stem of an eight-shape maze, in which they subsequently performed a spatial alternation task. We bilaterally recorded CA1 LFPs while rats executed at least 35 runs on the treadmill-maze apparatus. Within running periods, we observed progressive increases in delta band power along with decreases in the power of the theta and gamma bands across runs. Concurrently, the inter-hemispheric phase coherence in the delta band significantly increased, while in the theta and gamma bands exhibited no changes. Delta power and inter-hemispheric coherence correlated better with...Continue Reading

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Citations

Apr 14, 2021·Brain Research Bulletin·Hamid Soltani ZangbarMohsen Jafarzadehgharehziaaddin

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Methods Mentioned

BETA
light microscopy

Software Mentioned

MathWorks
MATLAB
Signal Processing Toolbox

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