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- supplemental material - Supplementary Figure 1. Grand PSTHs showing the average timing of suppression and release across the population. (A) The timing of cross-orientation suppression and release. The thick and thin black curves show the average response of 59 neurons. For reference, the onset response (duplicated from Fig. 4A) is shown in light gray. The responses were all aligned on the onset latency before being added; this time is indicated as 0. The thick solid black line shows the average response to the transition from a preferred grating to a plaid (�suppression�). The latency to suppression is determined by comparison with the response to continued presentation of a preferred grating (the thin solid black line). Similarly, the thick dashed black line shows the average response to the transition from a plaid to a preferred grating (�release�). The reference trace for this transition is a continued presentation of a plaid (thin dashed black line). The latency to suppression and release is very early, occurring even before the onset response. (B) The timing of surround suppression (data from Bair et al., 2003). Here, the thick and thin black curves represent the average response of 93 neurons. For reference, the onset response (duplicated from Fig. 4B) is shown in light gray. As in A, the traces were all aligned at the onset latency, which was set to 0. The thick solid black line shows the average response to a preferred grating while the surround changes from orthogonal to parallel (�suppression�). The latency to suppression is determined by comparison with the response to continued presentation of a preferred grating with orthogonal surround (the thin solid black line). Similarly, the thick dashed black line shows the average response to a preferred grating while the surround changes from parallel to orthogonal (�release�). The reference trace for this transition is a continued presentation of a preferred grating with a parallel surround (thin dashed black line). For cross-orientation suppression, the steep part of the change for suppression and release occurs before the steep part of the curve for onset, whereas the opposite is true for surround suppression (red circles highlight intersection points). We note that some surround suppression does occur early consistent with our previous finding that strong suppression can occur as early as onset in some cells (see Figure 5C from Bair et al., 2003).