This study was more or less a side project that does not quite fit in to the rest of my dichotic listening studies. The aim was simply to see if the dichotic listening selection would be influenced by simultaneous ecological visual stimuli. I made brief videos of a mouth pronouncing each of the six syllables, and played one of them simultaneously as the audio for the same syllable was played in one ear, and the audio of another syllable was played in the opposite ear. Participants were asked to report which sound they had heard. Unsurprisingly, the video presentation had the effect of increasing selection of the audio stream that matched the video.
In a way this study was the opposite of my priming studies: Rather than manipulating the selection between two equally valid simultaneous stimuli, the current study made one of the simultaneous stimuli "more valid" by adding a visual channel of information. The effect is reminiscent of the McGurk effect, but in this case it does not create a new percept, it simply "tips the scales" to select one rather than the other.
Sætrevik (2010) The influence of visual information on auditory lateralization - SJoP
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