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

Trends in Hearing
Xin ZhouColette M McKay

Abstract

An 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 ...Continue Reading

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Citations

Mar 1, 2021·The Journal of the Acoustical Society of America·Erin R O'NeillAndrew J Oxenham
Dec 6, 2019·Wiley Interdisciplinary Reviews. Systems Biology and Medicine·J Tilak Ratnanather

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Methods Mentioned

BETA
cochlear implant

Software Mentioned

MATLAB
NIRScout
Easycap
Minitab
Homer

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