The time-course of cortical responses to speech revealed by fast optical imaging
Autor: | Joseph C. Toscano, Gabriele Gratton, Susan M. Garnsey, Monica Fabiani, Nathaniel D. Anderson |
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Rok vydání: | 2018 |
Předmět: |
Adult
Male Linguistics and Language Speech perception Graded category Cognitive Neuroscience Speech recognition Neuroimaging Experimental and Cognitive Psychology ENCODE Article 050105 experimental psychology Language and Linguistics Young Adult 03 medical and health sciences Speech and Hearing 0302 clinical medicine Optical imaging Phonetics Event-related potential Encoding (memory) otorhinolaryngologic diseases Humans Speech 0501 psychology and cognitive sciences Optical Imaging 05 social sciences Brain Electroencephalography Time course Speech Perception Female Cues Psychology 030217 neurology & neurosurgery |
Zdroj: | Brain and Language. 184:32-42 |
ISSN: | 0093-934X |
DOI: | 10.1016/j.bandl.2018.06.006 |
Popis: | Recent work has sought to describe the time-course of spoken word recognition, from initial acoustic cue encoding through lexical activation, and identify cortical areas involved in each stage of analysis. However, existing methods are limited in either temporal or spatial resolution, and as a result, have only provided partial answers to the question of how listeners encode acoustic information in speech. We present data from an experiment using a novel neuroimaging method, fast optical imaging, to directly assess the time-course of speech perception, providing non-invasive measurement of speech sound representations, localized to specific cortical areas. We find that listeners encode speech in terms of continuous acoustic cues at early stages of processing (ca. 96 ms post-stimulus onset), and begin activating phonological category representations rapidly (ca. 144 ms post-stimulus). Moreover, cue-based representations are widespread in the brain and overlap in time with graded category-based representations, suggesting that spoken word recognition involves simultaneous activation of both continuous acoustic cues and phonological categories. |
Databáze: | OpenAIRE |
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