Armed Services Technical Information Agency

COMMUNICATION BY ELECTRICAL STIMULATION OF THE SKIN. J. ABSOLUTE IDENTIFICATION OF STIMULUS INTENSITY LEVEL fo determine the number of possible absolute identification» of t intensity levels in order to evaluate the usefulness of intensity e in an electrical cutaneous communication system. Intensity levels presented wore equally spaced in term« of apparent magnitude of sensation within the range producing vibratory sensations but not pain Subjects could absolutely identify two levels without error, «ith maximum transmission of information being achieved with the use of about three level». More information was transmitted when a.c. was presented at 1500 cpa than at 100 cps.