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by xprofessor on December 9th, 2007
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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