Table 3.

Summary of neural codes

Hypothesis tested	Outcome
(1) Firing rate of individual afferents (SA1, RA, PC)	Rejected because individual rate-intensity functions comprise long entrainment plateaus
(2) Mean firing rate of individual afferents	SA1, R2 = 0.68
	RA, R2 = 0.89
	PC, R2 = 0.74*
(3) Weighted firing rate of three afferent types located under the probe	R2 = 0.97
(4) Number of afferents of each type activated under the probe	Rejected because number of afferents recruited plateaus at low stimulus intensities (Fig. 4)
(5) Estimated total firing rate of each afferent type	SA1, R2 = 0.56
	RA, R2 = 0.80
	PC, R2 = 0.74*
(6) Estimated weighted firing rate of three afferent types	R2 = 0.96
(7) Estimated total number of afferents of each type activated by the stimulus	SA1, R2 = 0.10
	RA, R2 = 0.51
	PC, R2 = 0.54
(8) Estimated weighted number of active afferents	R2 = 0.86

*Codes are identical.