Journal article
The time-course of cortical responses to speech revealed by fast optical imaging
Brain and language, Vol.184, pp.32-42
09/01/2018
DOI: 10.1016/j.bandl.2018.06.006
PMCID: PMC6102048
PMID: 29960165
Abstract
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.
Details
- Title: Subtitle
- The time-course of cortical responses to speech revealed by fast optical imaging
- Creators
- Joseph C. Toscano - Villanova UniversityNathaniel D. Anderson - University of Illinois Urbana-ChampaignMonica Fabiani - University of Illinois Urbana-ChampaignGabriele Gratton - University of Illinois Urbana-ChampaignSusan M. Garnsey - University of Illinois Urbana-Champaign
- Resource Type
- Journal article
- Publication Details
- Brain and language, Vol.184, pp.32-42
- DOI
- 10.1016/j.bandl.2018.06.006
- PMID
- 29960165
- PMCID
- PMC6102048
- NLM abbreviation
- Brain Lang
- ISSN
- 0093-934X
- eISSN
- 1090-2155
- Publisher
- Elsevier
- Number of pages
- 11
- Grant note
- S10-RR029294 / NIH; United States Department of Health & Human Services; National Institutes of Health (NIH) - USA Beckman Postdoctoral Fellowship S10RR029294 / NATIONAL CENTER FOR RESEARCH RESOURCES; United States Department of Health & Human Services; National Institutes of Health (NIH) - USA; NIH National Center for Research Resources (NCRR) University of Illinois Research Board
- Language
- English
- Date published
- 09/01/2018
- Academic Unit
- Psychological and Brain Sciences
- Record Identifier
- 9984627206002771
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