Fig. 4: Microstimulation effect on PSE shift in 4-AFC roll and translation task.
From: Causal contribution of optic flow signal in Macaque extrastriate visual cortex for roll perception
a Example psychometric function for non-stimulated trials (control trials, blue symbols for roll task and red symbols for translation task) and stimulated trials (orange symbols) from the same site as shown in Fig. 3a. Solid curves and filled dots, psychometric function including trials only with correct flow pattern choice. Dashed curves and cross symbols, general error psychometric function including all trials within each flow pattern. Left column: microstimulation effect as a function of the actual stimulus as in the behavioral performance (Fig. 2a). Right Column: microstimulation effect as a function of preferred direction (PD) of the stimulated site. b Summary of microstimulation-induced PSE shifts (ΔPSE) in 4-AFC task for fine and coarse versions. Positive ΔPSE value represents shifts in the expected direction and negative value represents shifts in the opposite direction. 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 (*p < 0.05; **p < 0.01; ***p < 0.001, two-tail sign test). Fine-roll, p = 0.044; coarse-roll, p = 1.0e-3; fine-translation, p = 5.8e-7; coarse-translation, p = 2.6e-5. Dashed vertical lines: zero ΔPSE. c Comparison of normalized ΔPSE under fine and coarse versions. Filled circles: sites with significant ΔPSE under both versions; Crosses: sites with significant ΔPSE under either one version; Open circles: sites without significant ΔPSE in either version; Black lines: linear regress fit.
