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Comparison of 2-point discrimination (2PD) for touch, as measured by Weinstein,2 by Weber,3 and in the present study. Both Weinstein and Weber used simultaneous stimuli. In the present study, we used both simultaneous and successive stimuli. Error bars express variability (standard error) across participants. [Color figure can be viewed in the online issue, which is available at www.annalsofneurology.org.]
