Effects of neck muscle vibration on brain activity and motor learning in healthy young adults

The intervention will consist of experimentally induced, high-frequency, low-amplitude mechanical vibration applied to cervical muscles to transiently alter proprioceptive afferent input. Vibration will be delivered using portable mechanical vibration devices affixed to the skin over the right sternocleidomastoid muscle and left cervical extensor muscles using Hypafix tape. Participants will be randomly assigned to one of two active intervention groups: 80 Hz vibration or 100 Hz vibration. In the vibration conditions, mechanical vibration will be applied at the assigned frequency (80 Hz or 100 Hz) with an amplitude of less than 1 mm for a single continuous period of 10 minutes. The intervention will be delivered once during a single laboratory visit following baseline assessments. Participants will return to the laboratory 24 hours later for follow-up assessment of motor performance retention only. No vibration or comparator will be done on the retention day. The intervention will be delivered face-to-face on an individual basis in a controlled laboratory environment at a university research facility by trained research personnel with experience in neuromuscular and neurophysiological experimental protocols. Intervention fidelity will be ensured through the use of identical vibration devices and standardized placement procedures across participants. Adherence will be ensured through direct supervision by research staff, and completion of the full 10-minute stimulation period will be confirmed for all participants.