Movement-Related Potentials Associated with Motor Timing Errors as Determined by Internally Cued Movement Onset

Area of Science:

• Neuroscience
• Motor Control
• Electrophysiology

Background:

• Accurate motor timing is essential for effective motor control.
• The neural underpinnings of motor timing deficits are not well understood.
• Investigating electrophysiological correlates of motor timing errors can illuminate central motor control processes.

Purpose of the Study:

• To examine the electrophysiological correlates of motor timing errors.
• To investigate the relationship between motor timing abilities and movement-related neural activity.

Main Methods:

• Simultaneous electroencephalography (EEG) and electromyography (EMG) recordings were obtained from 22 healthy volunteers.
• Participants performed motor timing tasks.
• Movement-related potentials (MRPs) were analyzed at the Cz electrode, and motor timing error was quantified.

Main Results:

• A significant correlation was observed between motor timing errors and MRPs.
• Bereitschaftspotential (BP) and motor potential (MP) amplitudes were significantly attenuated in individuals with motor timing errors.
• Motor timing error specifically affected the late components of BP and MP, not movement monitoring potential.

Conclusions:

• Motor timing errors are associated with neural processes underlying self-initiated voluntary movement.
• Alterations in MRPs, particularly BP and MP, serve as electrophysiological markers for motor timing deficits.
• These findings offer insights into the central motor control mechanisms affected by impaired motor timing.