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Poster E79, Friday, November 10, 10:00 – 11:15 am, Harborview and Loch Raven Ballrooms

The Effect of Input Modality and Overt vs. Covert Production on Speech Perception in Articulatory Musculature

Naama Zur1,2, Avi Karni1,3, Zohar Eviatar1,2;1University of Haifa, 2Institute of Information Processing and Decision Making, 3Edmond J. Safra Brain Research Center for the Study of Learning Disabilities

The effects of input modality on covert and overt speech production were tested in a repetition task. The state feedback control (SFC) model suggested by Hickok, Houde, and Rong (2011) posits that speech generation involves predictions of sensory consequences to inner sensory representations of the vocal target to be conveyed, based on the state of the vocal muscles. Along these lines, the authors claim that most of speech output is based on inner representations of sensory targets, unless the target is external (could be possible if an auditory stimulus is to be repeated). In the aim to test this hypothesis, young adults were instructed to read or listen to recordings of sentences so as to consequently repeat them (repetition task). Articulatory muscle activity was recorded using surface electromyography (sEMG) in the orbicularis oris (OOI) and the thyrohyoideus (TH) muscles. The sEMG signal was analyzed in two different phases of the repetition task - stimuli presentation (input phase) and response (response phase). Both phases were compared to a baseline phase. The analysis of the results revealed reduced articulatory muscle activity compared to baseline, during the input phase. Thus, these findings show that the intention to subsequently repeat a short sentence, overtly or covertly, significantly modulated the articulatory musculature already during listening or reading (i.e., during the input phase).

Topic Area: Speech Motor Control and Sensorimotor Integration

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