McGurk Effect in Native vs. Non-Native German Speakers Maral Aghvinian Mentor: Gregory Hickok Öhström and Traunmüller’s (2007) study is an examination of the audiovisual phenomenon known as the McGurk Effect, a perceptual phenomenon that demonstrates an interaction occurring between hearing and vision in speech perception, in the Swedish language. This study shows that non-native speakers struggle immensely in distinguishing vowel sounds mismatched in roundedness. In the current study, we examine the effect of roundedness and openness in German speech sounds using native and non-native speakers through the McGurk Effect. The current data shows that subjects who are non-native, similar to the original Swedish study, struggle with the mismatched rounded vowel sounds. This experiment depicts the degree of confusion that can arise when different vowel sounds are dubbed over others, as well as distinguishing roundedness confusion from openness.