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Updated: Jun 18, 2026

Intracortical Inhibition Within the Primary Motor Cortex Can Be Modulated by Changing the Focus of Attention
Published on: September 11, 2017
Cholinergic modulation of interhemispheric inhibition in the mouse motor cortex
Takashi Handa1, Qing Zhang1, Hidenori Aizawa1
1Department of Neurobiology, Graduate School of Biomedical and Health Sciences, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima City, Hiroshima 734-8553, Japan.
Interhemispheric inhibition in the motor cortex is crucial for precise movements. This study reveals cell-type-specific mechanisms and acetylcholine
Area of Science:
- Neuroscience
- Motor Control
- Cellular Mechanisms
Background:
- Interhemispheric inhibition of the motor cortex is vital for accurate unilateral motor function.
- The precise cellular mechanisms and the role of acetylcholine in this process remain unclear.
Purpose of the Study:
- To investigate the cellular mechanisms of interhemispheric inhibition during unilateral motor behavior.
- To explore the impact of acetylcholine on interhemispheric inhibition and its underlying cellular circuitry.
Main Methods:
- Recorded neuronal activity from the bilateral motor cortex of mice during a paw-reaching task.
- Analyzed interhemispheric spike correlation at the cell-pair level, classifying putative cell types.
- Investigated the effects of pharmacological acetylcholine manipulation on neuronal activity.
Main Results:
- Discovered cell-type pair-specific enhancement of interhemispheric spike correlation during the reaching task.
- Demonstrated that acetylcholine modulates interhemispheric spike correlation.
- Found that muscarinic receptor antagonism enhanced inhibitory responses in deep cortical layers.
Conclusions:
- GABAergic interneurons in deep cortical layers, expressing muscarinic receptors, mediate the neuromodulation of interhemispheric inhibition.
- These findings elucidate cellular mechanisms underlying motor control and neuromodulation.
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