Fig. S1. (A) PA interactions with the CST. DRN stimulation preceded PT stimulation to show interactions. The top row shows the DRN response alone (gray) and the PT response alone (black). The gray arrows indicate the time of occurrence of the DRN stimulus. The stimulus artifacts are blanked. Each numbered row shows a different ISI, from 10 ms before the PT stimulus to zero. The DRN response alone is positioned as if it had a 10-ms lead over the PT stimulus. The PT response alone is positioned to align with all of the combined DRN–PT responses, which is highlighted in yellow. The downward-directed arrow marks the time of occurrence of the PT stimulus. The numbers in parentheses are IRI at the particular ISI. The red trace shows maximal facilitation; blue trace, no facilitation (Fig. 2A and B). (B) CST interactions with PAs. Similar to (A), but for PT stimulation preceding DRN stimulation. The green trace is the interval with maximal suppression (Fig. 2C). The dashed horizontal lines correspond to prestimulus zero.

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