Sweat artifact look like:

Sweat artifact look like:

• A. Slow-wave sleep
• B. A solid, fuzzy bar in the electrode channel
• C. A random, sudden "popping" in the electrode channel
• D. An arousal

Answer: (A)

Sweat artifact appears as slow, large-amplitude fluctuations in the EEG that are low in frequency, often resembling the delta waves seen in deep sleep. This happens when sweating changes the skin–electrode impedance, causing the signal to drift and produce sustained slow activity. Therefore, the appearance most consistent with sweat artifact is slow-wave–like activity, since the pattern mimics the slow, rhythmic waves rather than a brief spike, a sudden jump, or an arousal. A solid, fuzzy bar would point to a different impedance or contact issue, a random popping to an electrode impulse, and an arousal to a transient event with characteristic abrupt changes and EMG/EOG shifts. In practice, verify by checking impedance at the suspected site and re-preparing or reapplying gel as needed.

Sweat artifact appears as slow, large-amplitude fluctuations in the EEG that are low in frequency, often resembling the delta waves seen in deep sleep. This happens when sweating changes the skin–electrode impedance, causing the signal to drift and produce sustained slow activity. Therefore, the appearance most consistent with sweat artifact is slow-wave–like activity, since the pattern mimics the slow, rhythmic waves rather than a brief spike, a sudden jump, or an arousal. A solid, fuzzy bar would point to a different impedance or contact issue, a random popping to an electrode impulse, and an arousal to a transient event with characteristic abrupt changes and EMG/EOG shifts. In practice, verify by checking impedance at the suspected site and re-preparing or reapplying gel as needed.