Frontotemporal activation differs between perception of simulated cochlear implant speech and speech in background noise: An image-based fNIRS study
In this study we used functional near-infrared spectroscopy (fNIRS) to investigate neural responses in normal-hearing adults as a function of speech recognition accuracy, intelligibility of the speech stimulus, and the manner in which speech is distorted. Participants listened to sentences and repor...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2021-10-01
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| Series: | NeuroImage |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1053811921006613 |
| _version_ | 1819089842779193344 |
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| author | Jessica Defenderfer Samuel Forbes Sobanawartiny Wijeakumar Mark Hedrick Patrick Plyler Aaron T. Buss |
| author_facet | Jessica Defenderfer Samuel Forbes Sobanawartiny Wijeakumar Mark Hedrick Patrick Plyler Aaron T. Buss |
| author_sort | Jessica Defenderfer |
| collection | DOAJ |
| description | In this study we used functional near-infrared spectroscopy (fNIRS) to investigate neural responses in normal-hearing adults as a function of speech recognition accuracy, intelligibility of the speech stimulus, and the manner in which speech is distorted. Participants listened to sentences and reported aloud what they heard. Speech quality was distorted artificially by vocoding (simulated cochlear implant speech) or naturally by adding background noise. Each type of distortion included high and low-intelligibility conditions. Sentences in quiet were used as baseline comparison. fNIRS data were analyzed using a newly developed image reconstruction approach. First, elevated cortical responses in the middle temporal gyrus (MTG) and middle frontal gyrus (MFG) were associated with speech recognition during the low-intelligibility conditions. Second, activation in the MTG was associated with recognition of vocoded speech with low intelligibility, whereas MFG activity was largely driven by recognition of speech in background noise, suggesting that the cortical response varies as a function of distortion type. Lastly, an accuracy effect in the MFG demonstrated significantly higher activation during correct perception relative to incorrect perception of speech. These results suggest that normal-hearing adults (i.e., untrained listeners of vocoded stimuli) do not exploit the same attentional mechanisms of the frontal cortex used to resolve naturally degraded speech and may instead rely on segmental and phonetic analyses in the temporal lobe to discriminate vocoded speech. |
| first_indexed | 2024-12-21T22:14:22Z |
| format | Article |
| id | doaj.art-a35a747273184d8da8af09f588e979f9 |
| institution | Directory Open Access Journal |
| issn | 1095-9572 |
| language | English |
| last_indexed | 2024-12-21T22:14:22Z |
| publishDate | 2021-10-01 |
| publisher | Elsevier |
| record_format | Article |
| series | NeuroImage |
| spelling | doaj.art-a35a747273184d8da8af09f588e979f92022-12-21T18:48:29ZengElsevierNeuroImage1095-95722021-10-01240118385Frontotemporal activation differs between perception of simulated cochlear implant speech and speech in background noise: An image-based fNIRS studyJessica Defenderfer0Samuel Forbes1Sobanawartiny Wijeakumar2Mark Hedrick3Patrick Plyler4Aaron T. Buss5Speech and Hearing Science, University of Tennessee Health Science Center, Knoxville, TN, United States; Corresponding author.Psychology, University of East Anglia, Norwich, EnglandPsychology, University of Nottingham, Nottingham, UKSpeech and Hearing Science, University of Tennessee Health Science Center, Knoxville, TN, United StatesSpeech and Hearing Science, University of Tennessee Health Science Center, Knoxville, TN, United StatesPsychology, University of Tennessee, Knoxville, TN, United StatesIn this study we used functional near-infrared spectroscopy (fNIRS) to investigate neural responses in normal-hearing adults as a function of speech recognition accuracy, intelligibility of the speech stimulus, and the manner in which speech is distorted. Participants listened to sentences and reported aloud what they heard. Speech quality was distorted artificially by vocoding (simulated cochlear implant speech) or naturally by adding background noise. Each type of distortion included high and low-intelligibility conditions. Sentences in quiet were used as baseline comparison. fNIRS data were analyzed using a newly developed image reconstruction approach. First, elevated cortical responses in the middle temporal gyrus (MTG) and middle frontal gyrus (MFG) were associated with speech recognition during the low-intelligibility conditions. Second, activation in the MTG was associated with recognition of vocoded speech with low intelligibility, whereas MFG activity was largely driven by recognition of speech in background noise, suggesting that the cortical response varies as a function of distortion type. Lastly, an accuracy effect in the MFG demonstrated significantly higher activation during correct perception relative to incorrect perception of speech. These results suggest that normal-hearing adults (i.e., untrained listeners of vocoded stimuli) do not exploit the same attentional mechanisms of the frontal cortex used to resolve naturally degraded speech and may instead rely on segmental and phonetic analyses in the temporal lobe to discriminate vocoded speech.http://www.sciencedirect.com/science/article/pii/S1053811921006613fNIRSImage reconstructionCochlear implantsPost-lingual deafnessVocoded speechEvent-related design |
| spellingShingle | Jessica Defenderfer Samuel Forbes Sobanawartiny Wijeakumar Mark Hedrick Patrick Plyler Aaron T. Buss Frontotemporal activation differs between perception of simulated cochlear implant speech and speech in background noise: An image-based fNIRS study NeuroImage fNIRS Image reconstruction Cochlear implants Post-lingual deafness Vocoded speech Event-related design |
| title | Frontotemporal activation differs between perception of simulated cochlear implant speech and speech in background noise: An image-based fNIRS study |
| title_full | Frontotemporal activation differs between perception of simulated cochlear implant speech and speech in background noise: An image-based fNIRS study |
| title_fullStr | Frontotemporal activation differs between perception of simulated cochlear implant speech and speech in background noise: An image-based fNIRS study |
| title_full_unstemmed | Frontotemporal activation differs between perception of simulated cochlear implant speech and speech in background noise: An image-based fNIRS study |
| title_short | Frontotemporal activation differs between perception of simulated cochlear implant speech and speech in background noise: An image-based fNIRS study |
| title_sort | frontotemporal activation differs between perception of simulated cochlear implant speech and speech in background noise an image based fnirs study |
| topic | fNIRS Image reconstruction Cochlear implants Post-lingual deafness Vocoded speech Event-related design |
| url | http://www.sciencedirect.com/science/article/pii/S1053811921006613 |
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