The Effect of Articulatory Suppression on Speech Perception Originates from Phonological Rather Than Motor Interference.

Mouthing a syllable hampers speech perception. Does this “articulatory suppression” originates from phonological or motor interference? In favor of a phonological origin, we report that speech perception is impacted when participants performed speech-related movements (open/close the lips), but not when they executed non-speech-related movements (protrusion/retrusion of the lips).