How wide (mm) is the spatial threshold on the back of the arm? The back of the hand? The palm?
by 
Anonymous
ANSWERS: 1
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You're referring to what's called two-point discrimination. In the fingertips, the ulnar digits are more discriminating than the radial digits. Males and females have equal two-point discrimination during each age decade. Fingertips are twice as discriminating as the thenar and hypothenar areas, and the thenar and hypothenar areas are twice as discriminating as the volar side of the wrist; the wrist is twice as discriminating as the forearm. Source: http://www.ncbi.nlm.nih.gov/sites/entrez?db=pubmed&uid=318754&cmd=showdetailview&indexed=google
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