Oscillatory signatures of Repetition Suppression and Novelty Detection reveal altered induced visual responses in early deafness

Bednaya, Evgenia; Pavani, Francesco; Ricciardi, Emiliano; Pietrini, Pietro; Bottari, Davide

doi:10.1016/j.cortex.2021.05.017

Cited by 5 publications

(3 citation statements)

References 142 publications

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“…With orthographic visual stimuli, our group found stronger alpha ERD after stimulus onset across parietal scalp regions in CI users that may reflect stronger intramodal responses, but this activity did not correlate to SIN ability 29 . Early deaf individuals show reduced parietal scalp ERD in alpha and beta (15–25 Hz) rhythms for novel visual events (morphing circles) compared to NH controls, interpreted as a modification to automatic deviance detection for visual events in early deafness, or changes in the deployment of visual attention or inhibition 60 . These findings only suggest that CI users or deaf participants are expected to differ from control groups when measuring alpha rhythms in visual perception, but task- and stimulus-based differences make synthesis of findings difficult.…”

Section: Discussionmentioning

confidence: 98%

Evidence of visual crossmodal reorganization positively relates to speech outcomes in cochlear implant users

Paul

Bajin

Uzelac

et al. 2022

Sci Rep

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Deaf individuals who use a cochlear implant (CI) have remarkably different outcomes for auditory speech communication ability. One factor assumed to affect CI outcomes is visual crossmodal plasticity in auditory cortex, where deprived auditory regions begin to support non-auditory functions such as vision. Previous research has viewed crossmodal plasticity as harmful for speech outcomes for CI users if it interferes with sound processing, while others have demonstrated that plasticity related to visual language may be beneficial for speech recovery. To clarify, we used electroencephalography (EEG) to measure brain responses to a partial face speaking a silent single-syllable word (visual language) in 15 CI users and 13 age-matched typical-hearing controls. We used source analysis on EEG activity to measure crossmodal visual responses in auditory cortex and then compared them to CI users’ speech-in-noise listening ability. CI users’ brain response to the onset of the video stimulus (face) was larger than controls in left auditory cortex, consistent with crossmodal activation after deafness. CI users also produced a mixture of alpha (8–12 Hz) synchronization and desynchronization in auditory cortex while watching lip movement while controls instead showed desynchronization. CI users with higher speech scores had stronger crossmodal responses in auditory cortex to the onset of the video, but those with lower speech scores had increases in alpha power during lip movement in auditory areas. Therefore, evidence of crossmodal reorganization in CI users does not necessarily predict poor speech outcomes, and differences in crossmodal activation during lip reading may instead relate to strategies or differences that CI users use in audiovisual speech communication.

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Section: Discussionmentioning

confidence: 98%

Evidence of visual crossmodal reorganization positively relates to speech outcomes in cochlear implant users

Paul

Bajin

Uzelac

et al. 2022

Sci Rep

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show abstract

“…Evidence of alterations of induced oscillatory activity following sensory deprivation was reported not only within modality, for visual (Bottari et al, 2016) and auditory systems (Yusuf et al, 2017), but also cross-modally. In humans, early-onset deafness selectively affects induced oscillatory activity associated with visual processing (Bednaya et al, 2021). The present audio-visual MD effect (increased induced gamma activity) provides evidence in the same direction also for multisensory processing.…”

Section: Discussionmentioning

confidence: 99%

“…Importantly, distinct components of neural oscillations characterize different types of processing according to the direction of information flow: while the evoked activity, which is phase-locked to the stimulation, has mainly been associated with feedforward processing (thalamo-cortical), the induced oscillatory activity, which is not phase-locked to the onset of the stimulus, has mainly been associated with feedback processing (cortico-cortical connectivity, Klimesch et al, 1998; Tallon-Baudry and Bertrand, 1999; Chen et al, 2012). Studies in humans and non-human animal models demonstrated that permanent sensory deprivation primarily affects induced oscillatory activity (Bottari et al, 2016; Yusuf et al, 2017; Bednaya et al, 2021). As homeostatic plasticity is an intrinsic feedback mechanism (Turrigiano and Nelson, 2004), we predicted to primarily observe changes in induced oscillatory activity following temporary MD for both visual and audio-visual processing.…”

Section: Introductionmentioning

confidence: 99%

Short-term monocular deprivation boosts neural responsiveness to audio-visual events for the undeprived eye

Federici

Bernardi

Senna³

et al. 2022

Preprint

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A brief period of monocular deprivation (MD) in adults is known to induce short-term plasticity of the visual system. However, to what extent MD impacts beyond visual processing is unclear. Here, we investigated alterations of visual and audio-visual processing induced by MD measuring neural oscillations. Results revealed that MD modified neural activities associated with unimodal and multisensory processes in an eye-specific manner. Selectively for the Deprived eye, alpha activity was reduced within the first 150 ms of visual processing. Conversely, the response to audio-visual events was enhanced in the gamma range only for the Undeprived eye within 100-300 ms after stimulus onset. The analysis of gamma responses to unimodal auditory events clarified that MD elicited a crossmodal upweighting for the Undeprived eye. Source modeling suggested that the right parietal cortex played a major role in both visual and audio-visual MD effects. Notably, visual and audio-visual processing alterations emerged selectively for the induced (but not the evoked) component of the neural oscillations, indicating primary alterations in feedback connectivity. These findings support a model in which MD increases excitability for the Deprived eye and neural responsiveness to audio-visual and auditory events for the Undeprived eye. On the one hand, these results reveal the causal impact of MD on both unisensory and multisensory processes but with distinct frequency-specific profiles and, on the other hand, highlight the feedback nature of short-term neural plasticity. Overall this study shed light on the high flexibility and interdependence of the unimodal and multisensory functions.

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Neuroplasticity following cochlear implants

Pavani

Bottari²

2022

Handbook of Clinical Neurology

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Oscillatory signatures of Repetition Suppression and Novelty Detection reveal altered induced visual responses in early deafness

Cited by 5 publications

References 142 publications

Evidence of visual crossmodal reorganization positively relates to speech outcomes in cochlear implant users

Evidence of visual crossmodal reorganization positively relates to speech outcomes in cochlear implant users

Short-term monocular deprivation boosts neural responsiveness to audio-visual events for the undeprived eye

Neuroplasticity following cochlear implants

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