Figure 4.

Reading and walking generate images with different spatiotemporal contrast and luminance skewness. (a) Means of different spatiotemporal measurements. From left to right, spatial contrast, temporal contrast, spatial skewness, and temporal skewness, measured at different retinal regions in the eight subjects (fovea, upper periphery, and lower periphery). Color code for reading and walking as in previous figures. (b) Same as a for standard deviations of the measurements. *p < 0.05. **p < 0.01.