Size Discrimination on the Skin

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Science  31 Jan 1969:
Vol. 163, Issue 3866, pp. 488-489
DOI: 10.1126/science.163.3866.488


Reasons are given for rejecting the two-point threshold as the standard measure of spatiotactile resolution. As alternative techniques, thresholds were obtained for disc-size and disc-annulus discriminations. Disc-annulus thresholds are comparable to two-point values, but disc-size thresholds are smaller by a factor of 10. Thus, at least part of the cutaneous system is better organized for localization and sizing of a stimulus than for detection of discontinuities in it.

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