What should be the first reaction to detect 60 hertz artifact in one electrode?

The most appropriate first reaction when detecting a 60 hertz artifact in one electrode is to check the electrode impedance. This is critical because a high artifact can often be a result of poor contact between the electrode and the scalp. By ensuring the impedance is within acceptable limits, you can determine if the detection of the artifact is due to a connection issue.

When electrode impedance is properly checked and confirmed to be low, it can indicate that the recording system is functioning well at that electrode site. If however, the impedance is high, it would warrant corrections such as reapplying the electrode or ensuring that the site is properly prepared. This first step helps to ensure that any signals being recorded are accurate and not influenced by technical artifacts.

Utilizing filters or changing montages would be more applicable after confirming that the electrode is functioning properly, as these actions may not address the underlying issue of electrode contact. Assessing electrode impedance addresses potential flaws directly at the source, promoting the integrity of the EEG signals captured.