The OZ electrode is in the occipital (back) of the head, which is where we should not see an MMN. The FZ electrode is found in the frontal lobe of the brain, which is where we would expect the MMN to show. We averaged the brainwaves found in two specific electrodes- FZ and OZ. When it appears, this component shows that the brain registered the mouth was pronouncing a different word than the sound playing- in other words, it was not fooled by the illusion. The MMN is found in the 100-400 millisecond range after stimuli is shown. We wanted to see if explaining the McGurk effect to participants would affect the brain wave component known as Mismatch Negativity (MMN). In cognitive science we can use certain brain waves as markers for certain activities in the brain. Even when the audio only plays “ba, ba, ba”, if the mouth pronounces “fa”, the person will hear “fa, fa, fa”. This is shown when mouth pronunciations in a video can affect what a person hears. The McGurk effect shows that visual cues can affect what a person hears.
Our experiment focused on the auditory illusions known as the McGurk Effect. The blue line indicates the averaged brain waves in the standard conditions ( audio playing “BA” and mouth pronouncing “BA”). The red line indicates the averaged brain waves in the deviant condition (audio playing “BA” while mouth pronouncing “FA”).
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