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. 2011 May 26;11(6):5596–5615. doi: 10.3390/s110605596

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© 2011 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).

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Figure 5. — Panels A and B show microneurographic recordings from human single tactile RA afferents in the fingertips during stimulation as in Figures 1(C) and 3(A); a 10 mm/s sliding motion was applied across the distal phalanx. Panels C and D show spectral analysis of the nerve discharge trains from 12 repeated stimulus runs for the units shown in A and B. Grating spatial periodicity Δp_s is 280 μm in A and C, 360 μm in B and D. Principal frequencies resulting from Equation (1) according to the specific combination of grating spatial periodicity Δp_s and sliding velocity v are 35.7 and 27.8 Hz for Panels C and D, respectively, with meaningful coherence with the depicted experimental results. Horizontal lines in C and D show p < 0.01 confidence limits for significant frequency modulation.