Abstract
The vibrotactile frequency characteristic measured psychophysically on humans shows a flat, low‐frequency (10–50 Hz) portion and a U‐shaped, high‐frequency (50–700 Hz) portion. Considerable evidence indicates that the high‐frequency portion of the characteristic is mediated by the Pacinian corpuscles population. Neurophysiological measurements on individual corpuscles stimulated directly by sinusoidal displacements also show a characteristic U shape. The neural frequency characteristic decreases in bandwidth, sensitivity, and best frequency when the underlying neural response criterion is increased from low‐firing rates to rates approximating 1 spike/cycle. The slope of the lower limb of the curve remains at about 12 dB/octave, regardless of the criterion. The U‐shaped portion of the psychophysical frequency characteristic is best approximated by the neural response curve when the 1 spike/cycle criterion is used. The results were obtained on mechanoreceptors excised from cat mesentery and are consistent w...
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