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. Author manuscript; available in PMC: 2009 Jul 19.
Published in final edited form as: Behav Brain Res. 2008 Mar 12;190(2):165–173. doi: 10.1016/j.bbr.2008.02.044

Figure 5.

Figure 5

Slopes and intercepts (thresholds) of the rate-intensity functions of SA1, RA and PC fibers as a function of frequency. The form of the function was f(a) = [α(log(a) − log(β))] +where f(a) is the firing rate evoked by a stimulus of amplitude a and α and β are parameters fit to the mean rate-intensity functions obtained at each frequency for each type of afferent. The plus (+) sign denotes rectification (if f(a) < 0, f(a) is set to 0). As can be seen from the figure, SA1 afferents are most sensitive at the low frequencies, PC fibers at the high frequencies, and RA afferents at intermediate frequencies.