Vagus nerve stimulation
Application was made to the Bilateral and Unilateral groups in the study. In the sham group, the application was performed with a specially produced headset that does not conduct current. Applications in the unilateral group were performed on the left ear of the subjects. In the bilateral group, the application was performed in both ears. The application was performed for 20 min in all groups. In Bilateral and Unilateral groups, VNS was performed from the Vagustim device (Vagustim) with a frequency of 10 Hz, biphasic, 300 μs pulse width and modulation mode. In the current intensity adjustment, it was adjusted according to the subject's detection threshold and kept constant at this setting. The application was placed in contact with the cymba concha and tragus of the ear through a headset placed in the outer ear. To increase conductivity, a gel was applied to the headphone before application (Figure Vagustim device and transcutaneous vagus nerve stimulation.