Fig. 8: Similarity of preferred optic flow pattern within the receptive field.
From: Causal contribution of optic flow signal in Macaque extrastriate visual cortex for roll perception
a The preferred optic flow pattern in roll-rotation plane and translation plane for the same example site as in Fig. 2a. Gray square, the receptive field of the MU. Blue and red quivers, the vector flows in RF for roll-rotation stimuli and translation stimuli, respectively. Similarity of preferred optic flow pattern for this MU is 37.0%. b More examples of preferred optic flow pattern in RF for different similarity index. c Continuous distribution of similarity ranging from 0% (different) to 100% (similar). Gray bar, all data; Blue line, sites with RF containing the fovea; Orange line, sites with RF without covering fovea. d Relationship between similarity and RF properties. Similarity (color and size of dot) is plotted as a function of RF equivalent radius and eccentricity. e Normalized microstimulation-induced PSE shift under roll and translation task across three groups of similarity. Open dots, ΔPSE for individual site; Red dots, median of ΔPSE. Asterisk above dots, median ΔPSE significantly different from zero (n.s. not significant; *p < 0.05; **p < 0.01, two-tail sign test). Different group: pfine-roll = 5.2e−3, pfine-translation = 5.2e-3, pcoarse-roll = 0.043, pcoarse-translation = 0.099; Medium group: pfine-roll = 0.28, pfine-translation = 2.7e-3, pcoarse-roll = 0.096, pcoarse-translation = 1.3e-3; Similar group: pfine-roll = 0.87, pfine-translation = 5.1e-3, pcoarse-roll = 0.099, pcoarse-translation = 0.016. Horizontal lines, p value for 2-dimensional Kolmogorov–Smirnov test between fine and coarse versions or different groups of similarity. n.s. not significant; *p < 0.05; **p < 0.01. Fine version vs. coarse version: different group, p = 0.084; medium group, p = 0.025; similar group, p = 1.1e-3. Different group vs. Medium group, p = 0.17; Medium group vs. Similar group, p = 0.088; Different group vs. Similar group, p = 0.020. f Distribution of ΔPSE under roll task for sites with RF containing fovea in the fine (top) and coarse (bottom) versions. Filled and open bars represented significant (p < 0.05, probit regression) and nonsignificant (p > 0.05, probit regression) ΔPSE, respectively. Inverted triangles, median ΔPSE; Asterisks, median ΔPSE significantly different from zero; Fine version, p = 4.5e-4; Coarse version, p = 0.013. Dashed vertical lines: zero ΔPSE.
