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. Author manuscript; available in PMC: 2008 Dec 8.
Published in final edited form as: Somatosens Mot Res. 2008 Dec;25(4):209–221. doi: 10.1080/08990220802467612

Figure 4.

Figure 4

Angular tuning and directional consistency of RA and SA neurons. (A) Population polar plots of RA (black; n98) and SA (gray; n110) units. For each cell ON response magnitudes were normalized to the response evoked by the maximally effective angle. Individual polar plots were then rotated downwards and averaged across the population. (B) Vector angles and magnitudes calculated population polar plots in panel A. (C) Bar graphs depicting average angular tuning indices, calculated as the ratio of the maximal angle response (in spikes/stimulus onset) to the mean over all eight angles. Error bars=standard error of the mean. Asterisk denotes a statistically significant difference (p<0.05) between the two populations. (D) Directional consistency indices. SA neurons are more likely to respond to a given deflection direction regardless of the starting position of the deflection (see text).