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Electrically Evoked Stapedius Reflex Measurements in Cochlear Implantation and Its Application in the Postoperative Fitting Process
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Audiovisual Temporal Processing in Postlingually Deafened Adults with Cochlear Implants
Iliza M Butera1, Ryan A Stevenson2,3, Brannon D Mangus4
1Vanderbilt Brain Institute, Vanderbilt University, Nashville, TN, USA. ilizabutera@gmail.com.
Scientific Reports
|July 29, 2018
Summary
Cochlear implant (CI) users show similar temporal binding windows but a shift in speech perception, possibly due to increased attention to visual cues. This impacts how they integrate auditory and visual information.
Area of Science:
- Neuroscience
- Audiology
- Sensory Integration
Background:
- Cochlear implants (CI) provide limited auditory information, making visual cues crucial for speech comprehension in CI users.
- Understanding audiovisual temporal processing is vital for CI users, yet remains poorly understood.
Purpose of the Study:
- To investigate audiovisual temporal processing in postlingually deafened CI users compared to normal-hearing controls.
- To assess simultaneity judgment (SJ) and temporal order judgment (TOJ) for speech and non-speech stimuli.
Main Methods:
- Participants (48 CI users, 54 controls) performed unisensory and multisensory SJ and TOJ tasks.
- Varied onset timing between auditory and visual stimuli (speech/non-speech).
- Analyzed temporal binding windows, point of subjective simultaneity, and visual bias.
Main Results:
- No significant differences in temporal binding windows between CI users and controls for speech or non-speech stimuli.
- CI users showed a less visually leading point of subjective simultaneity for speech.
- CI users exhibited improved visual-only TOJ thresholds and potentially greater visual bias.
Conclusions:
- CI use may alter audiovisual speech integration, with a potential shift towards visual dominance.
- Heightened attentional allocation to visual cues might explain the observed perceptual shifts in CI users.
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