When 60Hz interference appears in two adjacent channels with a common electrode, what is the first action to take?

When 60Hz interference occurs in two adjacent channels with a common electrode, the appropriate first action is to check the electrode impedance and then reglue or replace the electrode. This is crucial because 60Hz interference, often a result of electrical noise from devices such as fluorescent lights or power supplies, can negatively affect the quality of the EEG signal.

If the impedance of the electrodes is too high or if there is poor contact with the scalp, it can exacerbate the interference issue, making it difficult to obtain a clean EEG reading. By checking the impedance, you ensure that the electrodes are functioning correctly and maintain good conductivity with the skin. If the impedance is found to be out of range, reglueing or replacing the electrode helps re-establish a proper connection, thereby minimizing interference and improving the clarity of the recording.

While recalibrating the entire EEG system, switching power outlets, or adjusting sensitivity settings could potentially address noise problems, these actions do not directly target the specific issue of electrode connectivity that is likely causing the interference in adjacent channels. Therefore, confirming and addressing electrode impedance is a straightforward and effective first step in troubleshooting the situation.