What is the best solution to correct a slow-wave artifact appearing in two channels sharing the same reference?

Re-referencing both leads to a different reference is the most effective solution for addressing a slow-wave artifact in two channels that share the same reference. When multiple channels exhibit the same artifact, it often indicates that the issue is related to the reference electrode used for both channels. By changing the reference point to a different location on the scalp, the common noise or artifact that was present due to the original reference can be minimized, allowing for clearer and more accurate recording of brainwave activity.

This method enhances the quality of the signal by ensuring that both channels are referencing a clean and unaffected signal, thus improving the overall data quality. Effective re-referencing can lead to a more accurate interpretation of the sleep patterns being recorded, crucial for proper diagnosis and treatment.

Increasing the gain on both channels could amplify the signals, but it would not resolve the underlying artifact issue; instead, it could exacerbate the problem by amplifying both the true signal and the artifact. Disconnecting one channel reduces the amount of data available and can lead to incomplete analysis. Shifting the time scale of the recording may make the artifact less noticeable on the displayed data, but it does not eliminate the artifact itself from the waveform, potentially leading to misinterpretations.