Seeing speech: visual information from lip movements modifies activity in the human auditory cortex |
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Authors: | M Sams R Aulanko M H?m?l?inen R Hari O V Lounasmaa S T Lu J Simola |
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Affiliation: | Low Temperature Laboratory, Helsinki University of Technology, Espoo, Finland. |
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Abstract: | Neuromagnetic responses were recorded over the left hemisphere to find out in which cortical area the heard and seen speech are integrated. Auditory stimuli were Finnish/pa/syllables presented together with a videotaped face articulating either the concordant syllable/pa/(84% of stimuli, V = A) or the discordant syllable/ka/(16%, V not equal to A). In some subjects the probabilities were reversed. The subjects heard V not equal to A stimuli as/ta/ or ka. The magnetic responses to infrequent perceptions elicited a specific waveform which could be explained by activity in the supratemporal auditory cortex. The results show that visual information from articulatory movements has an entry into the auditory cortex. |
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