Behavioural results.

Note: left/right = percentage of left/right decisions across experiment; mean trial duration given for each subject in seconds; “letter indicated” refers to the number of letters lapsed between the time at which a decision became conscious and the time at which the button was pressed (one letter = 500 ms duration). On average, all subjects indicated that the intention reached conscious awareness during the same time-bin (500 ms) or one time-bin earlier relative to the button press (0 = same time-bin, −1 = preceding time bin); Subjects indicated by pressing the “*” that they did not remember the letter presented when they became aware of their decision.