In EEG, a common artifact caused by muscle activity is known as?

Muscle activity produces electrical signals that can interfere with the readings obtained from an electroencephalogram (EEG). This phenomenon is specifically referred to as electromyographic (EMG) artifact. When muscles contract, they generate electrical activity, which can be detected by EEG electrodes. This can occur in various scenarios, such as when a patient is tense, anxious, or moves their facial muscles during the test.

An EMG artifact can obscure the brain waves of interest, making it difficult for clinicians to accurately interpret the EEG results. Therefore, recognizing and identifying EMG artifacts is crucial for the validity of the EEG recording. Proper patient preparations, such as instructing the patient to remain relaxed, can help minimize these muscle-related artifacts during the examination.

Other options may involve different types of artifacts related to electrode placement or device malfunctions, but they do not specifically refer to artifacts arising from muscle activity.