Cortical Speech Processing in Postlingually Deaf Adult Cochlear Implant Users, as Revealed by Functional Near-Infrared Spectroscopy

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dc.contributor.authorZhou, Xin
dc.contributor.authorSeghouane, Abd-Krim
dc.contributor.authorShah, Adnan
dc.contributor.authorInnes-Brown, Hamish
dc.contributor.authorCross, Will
dc.contributor.authorLitovsky, Ruth
dc.contributor.authorMcKay, Colette
dc.date.accessioned2018-07-23T03:13:03Z
dc.date.available2018-07-23T03:13:03Z
dc.date.issued2018-07
dc.description.abstractAn experiment was conducted to investigate the feasibility of using functional near-infrared spectroscopy (fNIRS) to image cortical activity in the language areas of cochlear implant (CI) users and to explore the association between the activity and their speech understanding ability. Using fNIRS, 15 experienced CI users and 14 normal-hearing participants were imaged while presented with either visual speech or auditory speech. Brain activation was measured from the prefrontal, temporal, and parietal lobe in both hemispheres, including the language-associated regions. In response to visual speech, the activation levels of CI users in an a priori region of interest (ROI)—the left superior temporal gyrus or sulcus—were negatively correlated with auditory speech understanding. This result suggests that increased cross-modal activity in the auditory cortex is predictive of poor auditory speech understanding. In another two ROIs, in which CI users showed significantly different mean activation levels in response to auditory speech compared with normal-hearing listeners, activation levels were significantly negatively correlated with CI users’ auditory speech understanding. These ROIs were located in the right anterior temporal lobe (including a portion of prefrontal lobe) and the left middle superior temporal lobe. In conclusion, fNIRS successfully revealed activation patterns in CI users associated with their auditory speech understanding.en_US
dc.description.sponsorshipThis research was supported by a Melbourne University PhD scholarship to X. Z., a veski fellowship to C. M. M, an Australian Research Council Grant (FT130101394) to A. K. S, and the Australian Fulbright Commission for a fellowship to R. L., the Lions Foundation, and the Melbourne Neuroscience Institute. The Bionics Institute acknowledges the support it receives from the Victorian Government through its Operational Infrastructure Support Program.en_US
dc.identifier.citationZhou, X., A. K. Seghouane, A. Shah, H. Innes-Brown, W. Cross, R. Litovsky, and C. M. McKay. 2018. Cortical Speech Processing in Postlingually Deaf Adult Cochlear Implant Users, as Revealed by Functional Near-Infrared Spectroscopy. Trends in Hearing. 22: 2331216518786850.en_US
dc.identifier.issn2331-2165
dc.identifier.urihttp://repository.bionicsinstitute.org:8080/handle/123456789/307
dc.language.isoenen_US
dc.publisherSAGEen_US
dc.subjectCochlear implanten_US
dc.subjectSpeech understandingen_US
dc.subjectFunctional near-infrared spectroscopyen_US
dc.subjectCortical activityen_US
dc.titleCortical Speech Processing in Postlingually Deaf Adult Cochlear Implant Users, as Revealed by Functional Near-Infrared Spectroscopyen_US
dc.typeArticleen_US
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