Mean muscle excitation of muscles with excitation higher than 20%; right side is contralateral; RPM: right posterior mylohyoid, RIP: right inferior head of lateral pterygoid, RSP: right superior head of lateral pterygoid, RSM: right superficial masseter, RAT: right anterior temporalis, LIP: left inferior head of lateral pterygoid, LMT: left middle compartment of temporal muscle, LPT: left posterior compartment of temporal muscle, LMP: left medial pterygoid, LSM: left superficial masseter, LAT: left anterior compartment of temporalis.