Wireless Surface Electromyography Recording of Facial Muscle Activity During Expressions

Begin with a human participant seated before a display screen, wearing an adhesive mask embedded with dry electrodes.

Electrodes are placed over the important facial muscles to non-invasively record surface electromyographic, or sEMG, signals linked to muscle movement.

A wireless unit near the ear collects and transmits these signals.

The participant follows various facial expression videos.

Each expression is held briefly, followed by a rest period, to capture muscle contraction and relaxation.

During an expression, motor neurons within the facial nerve send signals to the facial muscles, causing them to contract.

This generates electrical activity in the muscle fibers, detected at the skin surface as an sEMG signal.

As the muscles relax, these signals decrease.

The muscle contraction during the expressions shows high signal amplitude compared to the resting period, revealing distinct patterns for analyzing facial muscle activity.

To begin, carefully remove the electrode mask from the case and inspect its shape to ensure a proper fit on the face.

Place electrode number 11, marked with an eye symbol, near the participant's right eye. Position electrode number 8, marked with a nose symbol, on