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Neural correlates of visual stimulus encoding and verbal working memory differ between cochlear implant users and normal‐hearing controls
- Source :
- The European Journal of Neuroscience
- Publication Year :
- 2021
- Publisher :
- John Wiley and Sons Inc., 2021.
-
Abstract
- A common concern for individuals with severe‐to‐profound hearing loss fitted with cochlear implants (CIs) is difficulty following conversations in noisy environments. Recent work has suggested that these difficulties are related to individual differences in brain function, including verbal working memory and the degree of cross‐modal reorganization of auditory areas for visual processing. However, the neural basis for these relationships is not fully understood. Here, we investigated neural correlates of visual verbal working memory and sensory plasticity in 14 CI users and age‐matched normal‐hearing (NH) controls. While we recorded the high‐density electroencephalogram (EEG), participants completed a modified Sternberg visual working memory task where sets of letters and numbers were presented visually and then recalled at a later time. Results suggested that CI users had comparable behavioural working memory performance compared with NH. However, CI users had more pronounced neural activity during visual stimulus encoding, including stronger visual‐evoked activity in auditory and visual cortices, larger modulations of neural oscillations and increased frontotemporal connectivity. In contrast, during memory retention of the characters, CI users had descriptively weaker neural oscillations and significantly lower frontotemporal connectivity. We interpret the differences in neural correlates of visual stimulus processing in CI users through the lens of cross‐modal and intramodal plasticity.<br />People with hearing loss who have a cochlear implant (CI) have altered neural processing when engaged in a visual working memory task. During the visual stimulus encoding, CI users had greater visual and auditory cortex activation compared with normal‐hearing controls. Greater connectivity between temporal and frontal areas was observed for CI users compared with normal‐hearing controls.
- Subjects :
- Research Report
medicine.medical_specialty
genetic structures
medicine.medical_treatment
Cognitive Neuroscience
neural oscillations
Sensory system
Stimulus (physiology)
Electroencephalography
Audiology
Deafness
Visual processing
Hearing
Cochlear implant
medicine
Humans
Intramodal dispersion
hearing loss
visual processing
Auditory Cortex
Neural correlates of consciousness
medicine.diagnostic_test
Working memory
General Neuroscience
cochlear implant
verbal working memory
Cochlear Implantation
Cochlear Implants
Memory, Short-Term
connectivity
Psychology
Subjects
Details
- Language :
- English
- ISSN :
- 14609568 and 0953816X
- Volume :
- 54
- Issue :
- 3
- Database :
- OpenAIRE
- Journal :
- The European Journal of Neuroscience
- Accession number :
- edsair.doi.dedup.....7ed176c9df6abb48063f6529b4e1304a