The impact of training related improvements in motor articulation on audio-visual speech perception
LE3 .A278 2020
Bachelor of Science
There have been longstanding debates over the validity of “Motor Theories of Speech Perception.” Do motor systems contribute to speech perception in every-day speech? Does motor adaptation lead to changes in audio-visual speech perception? The study examined whether motor learning would lead to a change in audio-visual speech perception. Thirty-two Acadia University students participated in two tasks: an Audio-Visual speech perception task and a Motor Training task. The speech perception task measured participants’ ability to distinguish between the phonemes PA and TA when paired with either a video of PA or TA being articulated, or a still image. The Motor Training task had participants learn to rapidly and accurately produce word strings made up of words in which the consonant was articulated using the lips (e.g., “pie poe paw pea bye bow baw bee”) or the tongue (e.g., “die doe daw dee tie toe taw tee”). Critically, auditory feedback of speech was blocked during motor training. Audio-visual (AV) speech perception was measured before and after the motor training task. An improvement in word string production with training was observed, but training-related changes in speech perception were not significant due the lack of a significant relationship between the type of motor training group (either lip or tongue produced words) and changes in AV-speech perception.
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