Fig. 5.

Cumulative probability of afferent class firing and perceptual threshold. This demonstrates the proportion of percepts evoked and AFTs reached at a given monofilament force level. Lines represent FAI (single black line), FAII (double black line), SAI (single gray line), SAII (double gray line), and perception (dotted line). These data demonstrate that some FAI and FAII AFTs were lower than perceptual threshold, and perceptual threshold was reached in 60% of trials in the absence of substantial SAI and SAII contributions.