Contingent negative variations associated with jaw opening in humans

Area of Science:

• Neuroscience
• Motor Control
• Electrophysiology

Background:

• The contingent negative variation (CNV) is an electroencephalographic (EEG) signal associated with anticipation of a motor response.
• Understanding the neural mechanisms underlying voluntary motor tasks, like jaw opening, is crucial for diagnosing and treating related disorders.

Purpose of the Study:

• To investigate the relationship between contingent negative variation (CNV) amplitude and digastric muscle activity during a cued jaw-opening motor task.
• To explore the cortical distribution of CNV during this specific motor task.

Main Methods:

• Participants performed a cued jaw-opening task, responding to an auditory stimulus after a visual warning.
• Electroencephalograms (EEGs) were recorded and averaged time-locked to the visual stimulus.
• Bilateral digastric muscle activity was measured concurrently.

Main Results:

• Contingent negative variation (CNV) potentials were successfully recorded at multiple cortical sites.
• A significant tendency for larger CNV amplitudes was observed at temporal cortical placements.
• The study established a correlation between CNV amplitude and digastric muscle activity during the task.

Conclusions:

• The findings support the role of CNV in preparing and executing voluntary jaw-opening movements.
• Cortical activity, particularly in temporal regions, is significantly involved in the motor control of jaw opening.
• This research provides insights into the neurophysiological underpinnings of motor tasks involving the jaw musculature.