EFFECT OF SIMULTANEOUS BILATERAL TIBIAL NERVE-STIMULATION ON SOMATOSENSORY-EVOKED POTENTIALS (SEP) IN DOGS

Since somatosensory evoked potentials (SEP) by hindlimb nerve stimulat ion are known to ascend bilaterally in the spinal cord, it was investi gated whether or not simultaneous bilateral stimulation causes facilit ation or inhibition of the stimuli. In an experiment using 36 adult Be agle dogs, the difference between simultaneous bilateral stimulation a nd unilateral stimulation was studied as to latencies and amplitudes. No significant difference was noted. However, the detection of far-fie ld potentials by bilateral stimulation was not effective in which case far-field potentials did not recorded by unilateral stimulation. It w as therefore confirmed that simultaneous bilateral stimulation does no t cause facilitation or inhibition in the relay pathways, and does not affect the latency.