Adaptations in common synaptic inputs to spinal motor neurons during grasping versus a less functional hand task

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Mean discharge rates were lower during grasping compared to four-finger flexion, indicating altered synaptic input modulation.
Coherence in the alpha band decreased by about 20% during grasping compared to four-finger flexion, affecting muscle coordination.
Participants maintained isometric contractions while HDsEMG recorded motor unit activity, assessing task-specific neural control.
These findings suggest distinct neural mechanisms enhance force steadiness during functionally relevant grip tasks.

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Analysis of synaptic input modulation reveals distinct mechanisms in grasping and thumb flexion tasks.

Cabral et al. (2025) studied this question.

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