Multisensory Training Improves Auditory Spatial Processing following Bilateral Cochlear Implantation

Isaiah, Amal; Vongpaisal, Tara; King, Andrew J.; Hartley, Douglas E. H.

doi:10.1523/jneurosci.4767-13.2014

Cited by 65 publications

(61 citation statements)

References 78 publications

(41 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Such supramodal linguistic networks may be increasingly activated by both audition and vision, as an individual CI patient learns to optimally integrate auditory and visual information to maximize language understanding. In an animal model, vision has been shown to play a facilitative role in restoring sound localization abilities after cochlear implantation (28). In parallel, our findings provide unique evidence in humans for a synergistic relationship between audition and vision within auditory brain regions, indicating a facilitative mechanism between the modalities that underlies the restoration of speech understanding following cochlear implantation.…”

Section: Discussionsupporting

confidence: 61%

Adaptive benefit of cross-modal plasticity following cochlear implantation in deaf adults

Anderson

Wiggins

Kitterick

et al. 2017

Proc. Natl. Acad. Sci. U.S.A.

118

134

View full text Add to dashboard Cite

It has been suggested that visual language is maladaptive for hearing restoration with a cochlear implant (CI) due to cross-modal recruitment of auditory brain regions. Rehabilitative guidelines therefore discourage the use of visual language. However, neuroscientific understanding of cross-modal plasticity following cochlear implantation has been restricted due to incompatibility between established neuroimaging techniques and the surgically implanted electronic and magnetic components of the CI. As a solution to this problem, here we used functional near-infrared spectroscopy (fNIRS), a noninvasive optical neuroimaging method that is fully compatible with a CI and safe for repeated testing. The aim of this study was to examine cross-modal activation of auditory brain regions by visual speech from before to after implantation and its relation to CI success. Using fNIRS, we examined activation of superior temporal cortex to visual speech in the same profoundly deaf adults both before and 6 mo after implantation. Patients' ability to understand auditory speech with their CI was also measured following 6 mo of CI use. Contrary to existing theory, the results demonstrate that increased cross-modal activation of auditory brain regions by visual speech from before to after implantation is associated with better speech understanding with a CI. Furthermore, activation of auditory cortex by visual and auditory speech developed in synchrony after implantation. Together these findings suggest that cross-modal plasticity by visual speech does not exert previously assumed maladaptive effects on CI success, but instead provides adaptive benefits to the restoration of hearing after implantation through an audiovisual mechanism. cochlear implantation | cross-modal plasticity | functional near-infrared spectroscopy | superior temporal cortex | visual speech

show abstract

Section: Discussionsupporting

confidence: 61%

Adaptive benefit of cross-modal plasticity following cochlear implantation in deaf adults

Anderson

Wiggins

Kitterick

et al. 2017

Proc. Natl. Acad. Sci. U.S.A.

118

134

View full text Add to dashboard Cite

show abstract

“…Unlike Loizou et al who used speech maskers, Eapen et al used noise maskers like van Hoesel et al A binaural-interaction benefit was evidenced by improved performance when the worse ear – i.e., the CI on the side of the head closest to the noise – was added to the better ear. The fact that this benefit emerged after more than a year of listening experience raises the possibility that binaural advantages may emerge or increase with long-term BI-CI or SSD-CI listening experience or training (e.g., Tyler et al 2010; Isaiah et al 2014; Reeder et al 2015). The current study demonstrated that a binaural-interaction benefit was much more easily observed for a situation involving the perceptual separation of interfering talkers than for a noise interferer.…”

Section: Discussionmentioning

confidence: 99%

Having Two Ears Facilitates the Perceptual Separation of Concurrent Talkers for Bilateral and Single-Sided Deaf Cochlear Implantees

et al. 2016

View full text Add to dashboard Cite

Objectives Listening to speech with multiple competing talkers requires the perceptual separation of the target voice from the interfering background. Normal-hearing (NH) listeners are able to take advantage of perceived differences in the spatial locations of competing sound sources to facilitate this process. Previous research suggests that bilateral (BI) cochlear-implant (CI) listeners cannot do so, and it is unknown whether single-sided deaf CI users (SSD-CI; one acoustic and one CI ear) have this ability. This study investigated whether providing a second ear via cochlear implantation can facilitate the perceptual separation of targets and interferers in a listening situation involving multiple competing talkers. Design BI-CI and SSD-CI listeners were required to identify speech from a target talker mixed with one or two interfering talkers. In the baseline monaural condition, the target speech and the interferers were presented to one of the CIs (for the BI-CI listeners) or to the acoustic ear (for the SSD-CI listeners). In the bilateral condition, the target was still presented to the first ear but the interferers were presented to both the target ear and the listener's second ear (always a CI), thereby testing whether CI listeners could use information about the interferer obtained from a second ear to facilitate perceptual separation of the target and interferer. Results Presenting a copy of the interfering signals to the second ear improved performance, up to 4-5 dB (12-18 percentage points), but the amount of improvement depended on the type of interferer. For BI-CI listeners, the improvement occurred mainly in conditions involving one interfering talker, regardless of gender. For SSD-CI listeners, the improvement occurred in conditions involving one or two interfering talkers of the same gender as the target. This interaction is consistent with the idea that the SSD-CI listeners had access to pitch cues in their NH ear to separate the opposite-gender target and interferers, while the BI-CI listeners did not. Conclusions These results suggest that a second auditory input via a CI can facilitate the perceptual separation of competing talkers in situations where monaural cues are insufficient to do so, thus partially restoring a key advantage of having two ears that was previously thought to be inaccessible to CI users.

show abstract

“…Ferrets have been used extensively in physiological and anatomical studies of multisensory processing (e.g. King & Hutchings, 1987;King et al, 1988;King & Schnupp, 2000;Bizley et al, 2007;Bizley & King, 2008;Stitt et al, 2015), but only to a limited degree so far in behavioural experiments (Isaiah et al, 2014;Hollensteiner et al, 2015), despite the ease with which they can be trained to carry out localization and other sensory tasks. We have previously characterized sound localization behaviour in this species by measuring their head-orienting response following stimulus presentation and the subsequent locomotor response as the animals approach the perceived location of the sound source to receive a water reward (Nodal et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Behavioural benefits of multisensory processing in ferrets

Hammond-Kenny

Bajo

King

et al. 2016

Eur J of Neuroscience

View full text Add to dashboard Cite

Enhanced detection and discrimination, along with faster reaction times, are the most typical behavioural manifestations of the brain's capacity to integrate multisensory signals arising from the same object. In this study, we examined whether multisensory behavioural gains are observable across different components of the localization response that are potentially under the command of distinct brain regions. We measured the ability of ferrets to localize unisensory (auditory or visual) and spatiotemporally coincident auditory-visual stimuli of different durations that were presented from one of seven locations spanning the frontal hemifield. During the localization task, we recorded the head movements made following stimulus presentation, as a metric for assessing the initial orienting response of the ferrets, as well as the subsequent choice of which target location to approach to receive a reward. Head-orienting responses to auditory-visual stimuli were more accurate and faster than those made to visual but not auditory targets, suggesting that these movements were guided principally by sound alone. In contrast, approach-to-target localization responses were more accurate and faster to spatially congruent auditory-visual stimuli throughout the frontal hemifield than to either visual or auditory stimuli alone. Race model inequality analysis of head-orienting reaction times and approach-totarget response times indicates that different processes, probability summation and neural integration, respectively, are likely to be responsible for the effects of multisensory stimulation on these two measures of localization behaviour.

show abstract

Multisensory Training Improves Auditory Spatial Processing following Bilateral Cochlear Implantation

Cited by 65 publications

References 78 publications

Adaptive benefit of cross-modal plasticity following cochlear implantation in deaf adults

Adaptive benefit of cross-modal plasticity following cochlear implantation in deaf adults

Having Two Ears Facilitates the Perceptual Separation of Concurrent Talkers for Bilateral and Single-Sided Deaf Cochlear Implantees

Behavioural benefits of multisensory processing in ferrets

Contact Info

Product

Resources

About