Fig. 3.

Temporal quantification of the neural response. The peristimulus time histogram (PSTH; vertical bars) shows a typical response of a V1 neuron to a bar flashed in its RF for 300 ms. The horizontal bars above the PSTH represent the time epochs used for quantitative analysis: prepeak (red), peak (green), and late (blue). The prepeak epoch (red) was defined for each neuron as a 16-ms window beginning at the minimum response latency across conditions. The peak epoch (green) was determined independently for each neuron and each condition by using an automatic procedure to estimate the peak time, its width, and the latency of the response (see materials and methods). The late epoch was defined as a fixed interval (t = 100–200 ms; blue bar) based on the end of the initial response transient of the grand average of all cells in our sample.