Figure 9.
Directionally selective responses are decreased in Vsx1τLacZ/τLacZ mice. A, B, Polar plots representing the spike number (blue for ON spikes; red for OFF spikes) generated by a 400 μm spot moving in 8 directions (at 1000 μm/s) over a wild-type (wt) and a Vsx1τLacZ/τLacZ (−/−) DSGC, respectively. The dotted lines represent vectors indicating the preferred direction and the amplitude of the directional selectivity index. C, The average DSI for the ON response for wild type (0.72 ± 0.07; n = 4) and Vsx1τLacZ/τLacZ (0.34 ± 0.08; n = 4) were significantly different (*p < 0.05). Radial scale bar for polar plot: spike number/DSI.