Control analysis, using only the second half of each contrast episode.

Here, the spike-triggered analyses were performed by ignoring all spikes in the first half of each contrast episode in order to control for the effect of the early transient changes in firing rate. Results are shown for three sample cells (A-F, same cells as shown in Fig 1 of the main text) as well as for the STA fits of all recorded cells (G, H). Panels A-E should be compared with Fig 1 from the main text, panel F with the first column of Fig 3, and panels G,H with Fig 4A and 4D. As expected, extracted filters and fits show a higher level of noise as compared to including spikes from the entire duration of the contrast episodes, but otherwise, results and conclusions are unaffected.
(EPS)