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Consequences of Stimulus Type on Higher-Order Processing in Single-Sided Deaf Cochlear Implant Users
Mareike Finke1, Pascale Sandmann, Hanna Bönitz
1Cluster of Excellence ''Hearing4all'', Hannover Medical School, Hannover, Germany.
Audiology & Neuro-Otology
|November 21, 2016
Summary
Individuals with single-sided deafness and a cochlear implant (CI) show differences in central auditory processing between their CI ear and normal-hearing ear. Cognitive factors significantly impact speech perception, especially with degraded CI signals.
Area of Science:
- Neuroscience
- Audiology
- Cognitive Science
Background:
- Single-sided deafness (SSD) with cochlear implant (CI) allows within-subject comparison of electrical (CI) versus acoustic (normal-hearing, NH) input.
- Sensory processing differs between ears, but cognitive abilities remain constant, offering a unique research model.
Purpose of the Study:
- To investigate perceptual-cognitive factors influencing speech intelligibility in postlingually SSD CI users.
- To compare central auditory processing and cognitive abilities between the CI ear and the NH ear.
Main Methods:
- Electroencephalography (EEG) study involving 10 postlingually SSD CI users.
- Examined word processing, cognitive abilities, and speech intelligibility using an oddball task.
- Analyzed behavioral performance (hit rates, response times) and event-related potentials (N1, N2/N4).
Main Results:
- Lower hit rates and prolonged response times for word classification in the CI ear compared to the NH ear.
- Delayed sensory (N1) and cognitive (N2/N4) event-related potentials for the CI ear.
- Significant differences in both sensory and cognitive processing stages between the two ears.
Conclusions:
- Speech processing via CI and NH ears differs significantly at both sensory and cognitive levels.
- Cognitive processing stages (N2/N4) are affected by CI use, impacting speech discrimination.
- Cognition is a critical factor for speech perception, particularly with degraded auditory signals from CIs.
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