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Optogenetic Entrainment of Hippocampal Theta Oscillations in Behaving Mice

Optogenetic Entrainment of Hippocampal Theta Oscillations in Behaving Mice

Published on: June 29, 2018

Neural theta oscillations support semantic memory retrieval.

Martin Marko^1,2, Barbora Cimrová^1,2, Igor Riečanský^3,4

¹Department of Behavioural Neuroscience, Institute of Normal and Pathological Physiology, Centre of Experimental Medicine, Slovak Academy of Sciences, Bratislava, Slovakia.

Scientific Reports

|November 29, 2019

Summary

This summary is machine-generated.

Theta band brain oscillations influence semantic retrieval. The phase of theta oscillations, modulated by transcranial alternating current stimulation (tACS), specifically impacts controlled and automatic retrieval tasks.

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Area of Science:

Neuroscience
Cognitive Science
Brain Stimulation

Background:

Lexical-semantic retrieval involves distributed prefrontal and perisylvian brain networks.
Synchronous theta band neural oscillations are implicated in retrieval, but their precise role is unclear.

Purpose of the Study:

To investigate the functional significance of theta band oscillations in lexical-semantic retrieval.
To examine the task- and phase-specific effects of theta band neural oscillations on retrieval performance.

Main Methods:

Used transcranial alternating current stimulation (tACS) to induce 6 Hz theta oscillations.
Applied tACS over left prefrontal and posterior perisylvian cortex with in-phase (0°) and anti-phase (180°) relative phase differences.
Participants performed automatic and controlled lexical-semantic retrieval tasks during stimulation.

Main Results:

Theta-tACS significantly modulated retrieval performance in a task- and phase-dependent manner.
In-phase tACS impaired controlled retrieval.
Anti-phase tACS improved controlled retrieval but impaired automatic retrieval.

Conclusions:

Theta band oscillations play a crucial role in binding semantically related representations.
Phase-dependent modulation of semantic activation or maintenance by theta oscillations underlies retrieval processes.