Figure 6.

Extraclassical suppression emerges early in retinal and geniculate responses. A, Population RGC temporal response profile calculated from the first cycle of a 4 Hz drifting sine-wave grating (starting phase set to each cell's preferred phase). Red curve shows the time course of responses to an optimal size grating stimulus; blue curve shows the time course of responses to a large grating stimulus. The timing of responses is shown relative to t₍₀₎, which is the response latency of the RGCs when stimulated with an optimal size stimulus. RGC response latency was calculated separately for each cell. Shaded area corresponds to 95% confidence intervals. B, Population LGN temporal response profile (details the same as in A). t₍₀₎ is the LGN response latency of the LGN cells to an optimal size stimulus. C, Difference curves (optimal − large) for the RGCs (red) and LGN neurons (green). Stars indicate the suppression latencies for the RGCs and LGN neurons. t₍₀₎ is the LGN response latency for optimal size stimuli.