Fig. 3.

Characteristics of firing rate adaptation to switching-HPR stimuli for AN fiber population. A: time constants (τ) of average firing rate for upward and downward switches. Medians and 25–75% quartiles are 131 and 74–246 ms, respectively, for upward switches and 272 and 170–670 ms, respectively, for downward switches. Dotted line indicates identity (y = x). B: time constants do not show significant dependence on CF (P = 0.10 for upward switches and P = 0.42 for downward switches). C: time constants show a decreasing trend with spontaneous rate (r = −0.38, P = 0.006 for upward switches; r = −0.39, P = 0.004 for downward switches).