“…Second, there are substantial individual differences in the frequency of the McGurk effect, from 0 % to 100 % across different participants (Keil et al, 2012; McKenna Benoit et al, 2010; Nath & Beauchamp, 2012; Sekiyama, Braida, Nishino, Hayashi, & Tuyo, 1995; Stevenson, Zemtsov, & Wallace, 2012; Tremblay et al, 2007a). Third, different studies use different experimental procedures, and a procedure that incorporates experimenter expectations (âdid the stimulus sound like da?â) might give different results than one that does not (âwhat did the stimulus sound like?â) (Colin, Radeau, & Deltenre, 2005; Orne, 1962). In order to assess the possible contributions of differences in the stimuli, participants, and procedures to the variation in the published estimates of McGurk frequency, we tested 360 individuals, 20 different McGurk stimuli, and open-choice and forced-choice experimental procedures.…”