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Gradients of 2-point discrimination (2PD) thresholds on the hairy and glabrous skin of the upper (left panels) and lower limbs (right panels), for pain and touch. 2PD was assessed using either simultaneous stimuli (top panels, n = 16) or successive stimuli (bottom panels, n = 10), in separate experiments. Error bars express variability (standard error) across participants. [Color figure can be viewed in the online issue, which is available at www.annalsofneurology.org.]
