Audiovisual integration in children with cochlear implants revealed through EEG and fNIRS

Alemi, Razieh; Wolfe, Jace; Neumann, Sara; Manning, Jacy; Towler, Will; Koirala, Nabin; Gracco, Vincent L.; Deroche, Mickael

doi:10.1016/j.brainresbull.2023.110817

Cited by 3 publications

(3 citation statements)

References 89 publications

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“…It is widely agreed that visual speech speeds up cortical processing of auditory signals within 100 ms poststimulus onset, with N1 and P2, the most robust auditory event-related potentials, significantly reduced in amplitude by the influence of visual speech ( Van Wassenhove et al, 2005 ). Early cochlear implant users showed comparable auditory and visual potentials to their normal hearing peers, and their auditory activation became stronger in the AV compared with AO mode, likely due to reinforcement after implantation ( Alemi et al, 2023 ). Furthermore, the N1 and P2 components of auditory-evoked potentials are known to be suppressed due to AV interactions, resulting in earlier and smaller amplitudes compared with when no visual information is provided ( Van Wassenhove et al, 2005 ).…”

Section: Discussionmentioning

confidence: 99%

The Impact of Spectral and Temporal Degradation on Vocoded Speech Recognition in Early-Blind Individuals

Choi,

Kyong,

Lee

et al. 2024

eNeuro

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This study compared the impact of spectral and temporal degradation on vocoded speech recognition between early-blind and sighted subjects. The participants included 25 early-blind subjects (30.32 ± 4.88 years; male:female, 14:11) and 25 age- and sex-matched sighted subjects. Tests included monosyllable recognition in noise at various signal-to-noise ratios (−18 to −4 dB), matrix sentence-in-noise recognition, and vocoded speech recognition with different numbers of channels (4, 8, 16, and 32) and temporal envelope cutoff frequencies (50 vs 500 Hz). Cortical-evoked potentials (N2 and P3b) were measured in response to spectrally and temporally degraded stimuli. The early-blind subjects displayed superior monosyllable and sentence recognition than sighted subjects (allp < 0.01). In the vocoded speech recognition test, a three-way repeated-measure analysis of variance (two groups × four channels × two cutoff frequencies) revealed significant main effects of group, channel, and cutoff frequency (allp < 0.001). Early-blind subjects showed increased sensitivity to spectral degradation for speech recognition, evident in the significant interaction between group and channel (p = 0.007). N2 responses in early-blind subjects exhibited shorter latency and greater amplitude in the 8-channel (p = 0.022 and 0.034, respectively) and shorter latency in the 16-channel (p = 0.049) compared with sighted subjects. In conclusion, early-blind subjects demonstrated speech recognition advantages over sighted subjects, even in the presence of spectral and temporal degradation. Spectral degradation had a greater impact on speech recognition in early-blind subjects, while the effect of temporal degradation was similar in both groups.

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Section: Discussionmentioning

confidence: 99%

The Impact of Spectral and Temporal Degradation on Vocoded Speech Recognition in Early-Blind Individuals

Choi,

Kyong,

Lee

et al. 2024

eNeuro

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“…Also note that we replicated this contrast (and the weak visual cortex response of children in the LL group) with more advanced forms of visual stimulation (a speaking face in Alemi et al . 57 and written words/sudowords in another article in preparation). So, it is very unlikely that the passive nature of the current task was the main reason for a weak visual cortex response in the children of the LL group.…”

Section: Discussionmentioning

confidence: 96%

“…The data from the two imaging techniques were acquired sequentially, with counterbalanced order. Several other tasks were conducted using the same techniques in each child on the same day: a low-level auditory task, 56 a motor task, 54 a phonological task (spoken/written words and pseudo-words), an audiovisual integration task, 57 emotional processing (a 10-min child-friendly video from the movie ‘Despicable Me’) and a 7-min resting-state recording. 58 As the entire protocol for each technique was substantial, they were conducted at different times with a large break in between.…”

Section: Methodsmentioning

confidence: 99%

Cross-modal plasticity in children with cochlear implant: converging evidence from EEG and functional near-infrared spectroscopy

Deroche,

Wolfe,

Neumann

et al. 2024

Brain Communications

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Over the first years of life, the brain undergoes substantial organization in response to environmental stimulation. In a silent world, it may promote vision by 1) recruiting resources from the auditory cortex and 2) making the visual cortex more efficient. It is unclear when such changes occur and how adaptive they are, questions that children with cochlear implants can help address. Here, we examined 7 to 18 years old children: 50 had cochlear implants, with delayed or age-appropriate language abilities, and 25 had typical hearing and language. High-density electroencephalography and functional near-infrared spectroscopy were used to evaluate cortical responses to a low-level visual task. Evidence for a weaker visual cortex response and less synchronized or less inhibitory activity of auditory association areas in the implanted children with language delays suggests that cross-modal reorganization can be maladaptive and does not necessarily strengthen the dominant visual sense.

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Functional near-infrared spectrometry for auditory speech stimuli in cochlear implant users: a systematic literature review

Gomes,

Vasconcelos,

Meira Taveira

et al. 2024

Cochlear Implants International

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Audiovisual integration in children with cochlear implants revealed through EEG and fNIRS

Cited by 3 publications

References 89 publications

The Impact of Spectral and Temporal Degradation on Vocoded Speech Recognition in Early-Blind Individuals

The Impact of Spectral and Temporal Degradation on Vocoded Speech Recognition in Early-Blind Individuals

Cross-modal plasticity in children with cochlear implant: converging evidence from EEG and functional near-infrared spectroscopy

Functional near-infrared spectrometry for auditory speech stimuli in cochlear implant users: a systematic literature review

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