Figure 4.
Contrast gain modulation as a function of spatial and temporal frequency. Each graph is a contour plot showing a measure of response as a function of spatial and temporal frequency. The three columns show data for three complex cells, and the first two rows summarize spatiotemporal response fields for grating stimuli of 32 and 8% contrast. Response has been log transformed and normalized so that the peak response, indicated by the darkest shading, has a value of 1. The bottom row of contour plots show the difference between the high- and low-contrast responses, which is equivalent to contrast gain because the first two rows were log transformed. The horizontal and vertical dashed lines in the bottom row of plots were drawn at the spatial and temporal frequencies that provided the best response for stimuli of 8% contrast.
