The most common peripheral neuropathies have a predilection for sensory fibers in lower extremities. But, the SAP may not be acquired in ordinary method because the response is not consistent and variable. Using averaging technique requiring 32 stimuli, we recorded the sensory response in 30 normal subjects. The application of summation computers to the objective measurement of sensory function in the foot is eventually of diagnostic value in peripheral neuropathy, as yet time consuming and technically difficult.

The results were summarized as follow.

1) Thirty medial plantar nerves were studied. The mean value of conduction velocity was 31.95±4.23m/sec, that of distal latency was 6.26±0.57 msec, and that of amplitude was 3.99±1.26㎶.

3) There was significant difference in the conduction velocity and latency between medial and lateral plantar nerve.