Which of the following is NOT considered a physiological artifact?

The correct choice highlights that 60Hz interference is not classified as a physiological artifact. This type of interference is primarily an electrical artifact originating from external sources, such as power lines or electrical equipment. It manifests as a consistent wave frequency in the EEG signal, typically seen as noise that can obscure the underlying brain activity.

On the other hand, physiological artifacts are generated by the biological functions and activities of the patient being monitored. Perspiration can affect the electrode-skin impedance, creating variations in the recorded signal. The glossokinetic response, which is related to tongue movements, can also introduce changes to the EEG readings as it reflects a physical action of the individual. Similarly, eye movements produce detectable electrical activity known as ocular artifacts, visible as shifts in the EEG signal due to the movement of the eyes.

Understanding these differences is critical for EEG technicians and practitioners, as recognizing and distinguishing between physiological and non-physiological artifacts is essential for accurate interpretation of EEG data.