What is a common artifact source in a subcortical channel that can be resolved using a specific technique?

Using a spare C5S electrode can help resolve common artifact sources in a subcortical channel because it allows for a fresh electrode connection that may provide better contact and lower impedance, thereby enhancing signal quality. Subcortical recordings are sensitive to various types of artifacts, and a faulty or compromised electrode can introduce noise that obscures the true neurophysiological signals.

While other options could relate to sources of artifacts, specifically utilizing a spare electrode can effectively mitigate issues arising from electrode wear or poor connectivity. It's important to ensure that the electrodes used are in optimal condition, as they play a crucial role in acquiring accurate intraoperative monitoring data.

Utilizing a new or spare electrode, such as the C5S, enhances the integrity of the signal being recorded and can help distinguish true physiological responses from undesirable artifacts.