Figure 5. Quantitative model of the ECoG responses.

The left plots show ECoG responses from a V1 electrode in subject S1 from responses to a large-field flickering grating (‘On’; red) or a zero-contrast, mean luminance screen (‘Off’; green). The right plots show a simulation of responses to the same stimuli. The upper plots show the average time series from 72 one-second recording blocks. The lower plots show the average spectral responses (bright red and green) and the spectra of the average time series (dark red and green). The broadband response in the model and the data decreases significantly if the data are averaged in the time domain; the stimulus-locked response does not decrease substantially with averaging in the time domain. This observation is further quantified in Figure S5.