Influence of Speech-coding Strategy on Cortical Activity in Cochlear Implant Users: a Positron Emission Tomographic Study

The effects of a speech-coding strategy of cochlear implant (CI) on cortical activity were evaluated using positron emission tomography. The CIs used in the present study were those of a 22-channel system using the Multipeak speech-coding strategy (MPEAK) and the spectral peak strategy (SPEAK). On c...

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Bibliographic Details
Published in:Acta oto-laryngologica 1998-11, Vol.118 (6), p.797-802
Main Author: Nobuya Fujiki, Yasushi Naito, Shigeru Hirano, Hisayoshi Kojima, Yoko Kamoto, Sadahiko Nishizawa, Junji Konishi, Iwao Honjo
Format: Article
Language:English
Subjects:
Acoustic Stimulation
Adult
Auditory Cortex - blood supply
Auditory Cortex - diagnostic imaging
Biological and medical sciences
Cerebrovascular Circulation - physiology
Cochlear Implants
Female
Frontal Lobe - blood supply
Frontal Lobe - diagnostic imaging
Humans
Investigative techniques, diagnostic techniques (general aspects)
Male
Medical sciences
Nerve Net - physiology
Nervous system
Noise
Phonetics
Prosthesis Design
Radionuclide investigations
Speech Perception - physiology
Tomography, Emission-Computed
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Summary:The effects of a speech-coding strategy of cochlear implant (CI) on cortical activity were evaluated using positron emission tomography. The CIs used in the present study were those of a 22-channel system using the Multipeak speech-coding strategy (MPEAK) and the spectral peak strategy (SPEAK). On comparing the 2 groups, it was found that the speech-tracking performance was significantly higher in the SPEAK group than in the MPEAK group. Regional cerebral blood flow (rCBF) was measured during the silent resting, noise stimulus and speech stimulus periods. The increase in rCBF was localized mainly in the primary auditory area during the noise stimulus period. The increase in rCBF in the auditory association area during the speech stimulus period was stronger in the SPEAK group than in the MPEAK group. This finding suggests that the SPEAK strategy activates more speech processing neuronal networks in the auditory association area than the MPEAK strategy.
ISSN:0001-6489
1651-2251
DOI:10.1080/00016489850182468