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Higher anticipated force required a stronger inhibitory process in go/nogo tasks
Hiroki Nakata1, Koji Inui, Toshiaki Wasaka
1Department of Integrative Physiology, National Institute for Physiological Sciences, Okazaki, Japan.
Summary
Increasing muscle force requires stronger cortical inhibition for nogo stimuli but enhances motor evoked potentials (MEPs) for go stimuli, revealing a link between inhibition and force.
Area of Science:
- Neuroscience
- Motor Control
- Electrophysiology
Background:
- The relationship between motor control and inhibitory processes is crucial for voluntary movement.
- Understanding how the brain modulates neural activity based on required force output is essential.
Purpose of the Study:
- To investigate the impact of increasing muscle force on inhibitory processes.
- To examine the effects on event-related potentials (ERPs) and motor evoked potentials (MEPs).
Main Methods:
- Participants performed a go/nogo task using an S1-S2 paradigm with auditory and electrical stimuli.
- Recordings were taken at three maximal voluntary contraction (MVC) levels: 10%, 30%, and 50%.
- Motor evoked potentials (MEPs) and event-related potentials (ERPs) were analyzed in relation to muscle force.
Main Results:
- Nogo-N140 amplitude increased significantly with rising muscle force, indicating enhanced inhibitory activity.
- Motor evoked potentials (MEPs) decreased with increasing force in nogo trials.
- Conversely, MEPs increased with higher muscle force in go trials.
Conclusions:
- Stronger inhibitory cerebral activity is necessary for nogo stimuli when a greater response is required for go stimuli.
- A significant relationship exists between the cortical inhibitory process and the level of muscle force exerted.