Fig. 12. Cycle histograms relating the precision of temporal patterning to vibrotactile stimuli at peak frequency of activation. (A) Representative cycle histograms from each of the three receptor classes (N=100). (B) Three units with the highest degree of phase locking (N=100). (C) There was adequate data present to calculate cycle histograms across each stimulus frequency for unit number 14-4. As frequency increased the receptor became less phase locked, however, all impulses fell within a 1 ms time frame. V, variance; R, length of mean vector.