title: Motor excitability during visual perception of known and unknown spoken languages.
abstract: It is possible to comprehend speech and discriminate languages by viewing a speaker's articulatory movements. Transcranial magnetic stimulation studies have shown that viewing speech enhances excitability in the articulatory motor cortex. Here, we investigated the specificity of this enhanced motor excitability in native and non-native speakers of English. Both groups were able to discriminate between speech movements related to a known (i.e., English) and unknown (i.e., Hebrew) language. The motor excitability was higher during observation of a known language than an unknown language or non-speech mouth movements, suggesting that motor resonance is enhanced specifically during observation of mouth movements that convey linguistic information. Surprisingly, however, the excitability was equally high during observation of a static face. Moreover, the motor excitability did not differ between native and non-native speakers. These findings suggest that the articulatory motor cortex processes several kinds of visual cues during speech communication.
authors: Department of Experimental Psychology, University of Oxford, South Parks Road, Oxford OX1 3UD, United Kingdom.
authors: Swathi
authors: S
authors: Swaminathan
authors: Mairéad
authors: M
authors: MacSweeney
authors: Rowan
authors: R
authors: Boyles
authors: Dafydd
authors: D
authors: Waters
authors: Kate E
authors: KE
authors: Watkins
authors: Riikka
authors: R
authors: Möttönen
mesh_terms: D000328:Adult; D019054:Evoked Potentials, Motor / Q000502:physiology*; D005260:Female; D006801:Humans; D007802:Language; D008085:Lipreading; D008297:Male; D009044:Motor Cortex / Q000502:physiology*; D013067:Speech Perception / Q000502:physiology*; D050781:Transcranial Magnetic Stimulation; D014796:Visual Perception / Q000502:physiology*; D055815:Young Adult
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