Somatosensory evoked potentials produced by peroneal nerve stimulation at different spinal cord levels.

A) In wild type Sprague-Dawley (WT) male rats the somatosensory evoked potentials have a characteristic negative wave (upward deflection, black arrow) followed by a single positive (downward deflection), being maximum at T 12 -L 1 and L 2 -L 1 interspinal levels. B) Male taiep rats have two negative peaks (upward deflections, black arrows) being the second (N 2 ) clearly delayed followed by positive evoked wave that is similar to that obtained in WT rats.