The cEMG provides information on all of the following EXCEPT:

The cEMG provides information on all of the following EXCEPT:

• A. Snoring
• B. Teeth grinding
• C. Electrical activity within the brain
• D. Muscle tone of the chin muscles

Answer: (C)

Submental EMG, or cEMG, records the activity of the chin muscles to assess muscle tone during sleep. This channel helps identify how tense the chin muscles are across sleep stages and can reflect jaw or facial muscle activity, such as clenching or grinding, and how tone changes around arousals or during REM sleep. But it does not measure brain electrical activity. That information comes from the EEG channels that monitor cortical activity. Snoring and teeth grinding may involve facial or jaw muscles and can be inferred from related muscle activity or other signals, but the brain’s electrical activity itself is not captured by the chin EMG.

Submental EMG, or cEMG, records the activity of the chin muscles to assess muscle tone during sleep. This channel helps identify how tense the chin muscles are across sleep stages and can reflect jaw or facial muscle activity, such as clenching or grinding, and how tone changes around arousals or during REM sleep. But it does not measure brain electrical activity. That information comes from the EEG channels that monitor cortical activity. Snoring and teeth grinding may involve facial or jaw muscles and can be inferred from related muscle activity or other signals, but the brain’s electrical activity itself is not captured by the chin EMG.