Why Might a Researcher Choose to Use Electromyography (EMG) to Quantify

Multiple Choice

Why might a researcher choose to use electromyography (EMG) to quantify facial muscle activity instead of Facial Action Coding Scheme (FACS) ratings?

A) If the researcher wants to easily measure the movement of all facial action units
B) If the researcher is interested in detecting small muscle contractions that are not visible to observers
C) If the participant needs to be active and moving around during the experimental procedure
D) If the facial expressions of the participant are expected to be big and exaggerated