Mechanical thresholds for the different cutaneous mechanoreceptor classes. Mean (SE) thresholds for evoking an action potential in the 9 different skin regions are given for all afferent types (A), fast-adapting type I (FAI; B), fast-adapting type II (FAII; C), slowly adapting type I (SAI; D), and slowly adapting type II (SAII; E). Heel, calcaneus; LatArch, MidArch, and MedArch, lateral, middle, and medial arch; LatMet, MidMet, and MedMet, lateral, middle, and medial metatarsals; GT, great toe; Toes, digits 2–5.