Can muscle tension interfere with EEG recordings?
Yes. Muscle tension can interfere with EEG recordings by introducing artifacts that affect signal quality. Tension in the face, jaw, neck, or shoulders can contaminate EEG signals and reduce recording quality. The training materials specifically identify facial tension, jaw movement, and other muscle activity as common sources of artifacts during EEG acquisition.
How does muscle tension affect EEG signals?
EEG recordings are sensitive to sources of electrical activity other than the brain. Muscle activity, such as tension in the facial, jaw, neck, or shoulder muscles, can introduce artifacts into the EEG signal. These artifacts can affect signal quality and reduce the quality of the recorded data.
Impact on signal quality
The SAM system displays signal quality indicators to help assess recording quality. Increased muscle activity can contribute to reduced signal quality, making it important to identify and address muscle tension during the recording.
Importance of a relaxed posture during EEG recording
Maintaining a comfortable and relaxed posture helps minimize muscle tension during EEG recording. Patients are instructed to relax the face, jaw, neck, and shoulders and to minimize unnecessary movement. Remaining relaxed and still supports good signal quality throughout the recording.
Notes
- Muscle tension is a common source of EEG recording artifacts.
- Reducing unnecessary movement and muscle tension helps support stable signal quality during EEG recording.
- Patients should remain relaxed, still, and awake throughout both eyes-open and eyes-closed recording conditions.