GoKawiilStimulating ~20 motor cortex neurons triggers learned movements in mice
Researchers used two-photon imaging and holographic optogenetics to stimulate small groups of neurons in the motor cortex of mice trained on a lever-pressing task. Briefly activating about 20 neurons whose firing normally precedes voluntary movement produced both movements resembling the learned action and brain activity patterns resembling the natural learned pattern. The effect depended on the mouse being task-engaged and on stimulating the correct, early-firing neurons rather than ones that fire after movement onset.
GoKawiil's interpretation of the reporting above, not reported fact.
The findings suggest the motor cortex does not merely record or relay movement commands generated elsewhere but can actively generate the specific neural patterns underlying a learned skill, according to the researchers. This could inform how brain-machine interfaces or neurostimulation therapies might someday be designed to restore learned movements after injury, though the work was done in mice and its relevance to humans remains unproven. The result that stimulation sometimes produced the learned brain pattern without any movement also hints that such internally generated activity may serve a planning or representational role beyond driving muscles directly.
- Stimulating ~20 specific M1 neurons could induce movements resembling a mouse's trained lever-press action.
- The induced neural activity matched the natural learned spatiotemporal pattern, and its variability was predictable from the brain's initial state.
- Stimulation only worked in task-engaged mice and only when targeting neurons that fire before movement onset, not after.
Source: nature.com — Chen, 2026-10-14
Published there as: “Targeted stimulation of motor cortex ensembles drives learned movements”
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