Skip to Main content Skip to Navigation
Theses

Liens entre niveaux perceptifs, performances auditives et réponses électrophysiologiques de la cochlée et du tronc cérébral suite à la stimulation électrique délivrée par les implants cochléaires MED-EL

Abstract : This thesis investigates the links between electro-physiological responses of the cochlea and the brainstem, the psychoacoustic levels used for CI fitting and the hearing performances of MED-EL® cochlear implant (CI) adult users.The main part focused on the electrically evoked compound action potentials (ECAP), which reflect the synchronous activity of cochlear auditory neurons in response to the electrical stimulation delivered by CI. These were recorded either during implantation surgery or in experienced users to evaluate their usefulness as predictors of the hearing levels. Our work shows that despite broad variations between users, ECAPs can be related to perception levels. This relationship does not allow yet an accurate enough prediction of the perception levels used to program the CI.In MED-EL® CIs impedances raw data are displayed in voltage matrices and can be used to estimate the spread of current around each electrode, at the bioelectric interface level. In a second part, we aimed to evaluate the relationshipss between the current spread and speech recognition. The results indicate that speech understanding does not seem to be related to this measurement of intra-cochlear current diffusion.The last part of this thesis evaluated the relationship between an electro-physiological measurement of binaural interaction (BIC) and binaural hearing performances in subjects using two CI. Our results suggest that subjects with identifiable BICs appear to have better localization scores and make a better benefit from the binaurality as they have to understand speech in noisy environment
Document type :
Theses
Complete list of metadatas

Cited literature [241 references]  Display  Hide  Download

https://tel.archives-ouvertes.fr/tel-01883801
Contributor : Abes Star :  Contact
Submitted on : Friday, September 28, 2018 - 5:02:17 PM
Last modification on : Thursday, November 21, 2019 - 2:16:40 AM
Long-term archiving on: : Saturday, December 29, 2018 - 3:36:58 PM

File

TH2017JOLYCHARLESALEXANDRE.pdf
Version validated by the jury (STAR)

Identifiers

  • HAL Id : tel-01883801, version 1

Citation

Charles-Alexandre Joly. Liens entre niveaux perceptifs, performances auditives et réponses électrophysiologiques de la cochlée et du tronc cérébral suite à la stimulation électrique délivrée par les implants cochléaires MED-EL. Neurosciences [q-bio.NC]. Université de Lyon, 2017. Français. ⟨NNT : 2017LYSE1279⟩. ⟨tel-01883801⟩

Share

Metrics

Record views

177

Files downloads

81