Fig. 1.

Timeline of a single trial in the event-triggered sparse sampling protocol. At the onset of each trial, the visual stimulus appeared and remained onscreen for 2 seconds (blue rectangle). On perturbed trials, auditory feedback was shifted during the subject’s response (green). 3 seconds after stimulus offset, two whole-brain volumes were acquired (A1, A2). Data acquisition was timed to cover the peak of the hemodynamic response to speech; the putative hemodynamic response function (HRF), is schematized in red. The next trial started 3 seconds after data acquisition was complete, resulting in a total trial length of 12 seconds.