Effects of Electrical Stimulation of the Vestibular System on Neuronal Activity of the Ipsilateral Medial Vestibular Nuclei Following Unilateral Labyrinthectomy in Rats. Moon Yong Lee， Min Sun Kim， and Byung Rim Park Department of Physiology， Wonkwang University School of Medicine， Medicinal Resources Research Center of W onkwang University， Iksan 570 - 749， Korea The purpose of this stu야 was to evaluate t뾰 effects of electrical stimulation on vestibular compensation following ULX in rats. Electrical stimulation (ES) with square pulse (100 - 300 uA， 1.0 ms， 100 Hz) was applied to ampullary portion bilaterally for 6 and 24 hours in rats receiving ULX. After ES， animals that showed the recovery of vestibular symptoms by counting and comparing the number of spontaneous nystagmus were selected for recording resting activity of type 1， 11 neurons in the medial vestibular nuclei (MVN) of the lesioned side. And then the dynamic neuronal activities were recorded during sinusoidal rotation at a frequency of 0.1 Hz and 0.2 Hz. The number of spontaneous nystagmus was significantly different 24 hours (p