Figure 2.
Responses of two example V4 neurons. A, D, PSTHs for the responses of two cells to different stimulus contrasts and different attention states. The thick black line at the bottom of each histogram marks the stimulus duration. Each histogram was Gaussian filtered (8 ms SD). The dark gray area shows the response in the attended condition and the light gray area shows the response in the unattended condition. Horizontal solid lines show the mean response magnitudes (firing rate) during the sampling period in the attended condition, and dashed lines show mean response magnitudes in the unattended condition. Vertical lines show the corresponding response latencies in each condition. B, E, Plots of the relationship between response magnitude and latency for the same cells, parameterized by stimulus contrast and attention. Filled circles show response magnitude and latency at different contrasts in attended condition, and open circles show response magnitude and latency for the same stimuli in the unattended condition. Error bars are 95% confidence intervals from bootstrap. C, F, Some of the same data from B and E, plotted on an expanded time scale.