Figure 1.

(A) Plots depicting when a participant felt they had pressed a button before they had heard a tone on the final sequence of a trial, expressed as a function of the physical timing differences between these events. Tones were presented at 0 ms. Negative values signify that the further button was pressed before the tone, whereas positive values signify that the further button was pressed after the tone. Data is depicted for a representative participant from baseline (above) and adaptation (below) runs of trials in Experiment 1a. (B) Depiction of experimental paradigm. This involved participants resting their finger on the nearer of two buttons and then, when they chose, reaching out as fast as possible to press the far button. During a trial this sequence was repeated up to 8 times. On all but the final sequence pressing the far button triggered a tone. On the final sequence the tone was not triggered by the participant pressing the far button but, after a delay, by the participant lifting their finger from the nearer button. This allowed us to sample tone presentation times that both preceded and lagged the final press of the further button. See Methods for further details.