Cortical somatosensory evoked potentials from lumbosacral dermatomes: airpuff versus electrical stimulation.

Cortical potentials were elicited by airpuff stimulation of the L5 and S1 dermatome in a group of 24 healthy volunteers. The results were compared with the SEPs obtained by conventional electrical stimulation. Both stimulus modalities produce stable and good reproducible cortical responses of similar waveform.