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Figure 5


Fig. 5. Plot of the frequency of maximum sensitivity for all RA cells. Two distinct populations were evident. One cluster of units was most responsive to sinusoidal compression at 250–300 Hz with displacement of 20 and 28 µm. A more diffuse cluster of units (lower right) was most responsive to sinusoidal compression ranging from 5-100 Hz at amplitudes from 100–485 µm. The upper left group was classified as Pacinian-like (PC-like) whereas the lower right group was classified as RA-unknown (RA-X). Two receptors were intermediate. Both showed peak activation at 150 Hz but one (cell 8-1) responded to a 10 µm displacement and the other (cell 14-2) responded at an amplitude of 85 µm. Inset 1 shows the response of 8-1 to static displacement in a PC-like manner. Inset 2 shows cell 14-2 was unresponsive to sinusoidal compression at 200 Hz and so was classified as RA-X.





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