Autonomic Nerve Stimulation Using External Auditory Canal Electrodes

"* Evaluation of electrocardiogram measurement from external auditory canal electrodes: Participants are required to attach specially designed external auditory canal electrodes to their both ears to record electrocardiogram. Both electrocardiogram from the precordium and the ear would be simultaneously recorded and compared.~* Evaluation of low-level autonomic nerve stimulation using external auditory canal: Using the electrodes described above, Arnold's nerve will be stimulated with low-level electric impulses using TENS device. During and after the stimulation, heart rate variability will be measured to investigate the impact of nerve stimulation on autonomic function modulation on the heart."