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Poster

Visual Abstract

Reduction of right-lateralised cortical activity in response to speech following Cochlear Implantation in pre-lingually deafened subjects

Presented in

Cochlea Implantation 2

Poster topics

Otologie / Neurootologie / Audiologie

Authors

Björn Kropf (Essen; Heidelberg), Kurt Steinmetzger (Heidelberg; Berlin), André Rupp (Heidelberg)

Abstract

Objective:

In case of severe hearing loss early in life or congenital deafness, cochlear implants (CIs) represent the method of choice to restore hearing and enable language acquisition. While it is generally agreed upon that speech perception is positively influenced by early CI implantation, the neuroplastic changes following implantation are poorly understood. This study was designed to gain insights into the underlying neurophysiological processes.

Methods:

We longitudinally compared the cortical processing of speech stimuli in a case-control design with two groups of pre-lingually deafened CI users, differing in experience (CI-T1, n=17; CI-T2 n=12), and an age-matched control group with normal hearing (NH, n=13; mean group ages ~9 years). In two experiments, participants were either presented with running speech or vowel sequences while functional near-infrared spectroscopy (fNIRS) and electroencephalography (EEG) data were obtained simultaneously.

Results:

Overall, there was little evidence that cortical activity in the more experienced CI group (25.8 vs. 4.4 months) approached the higher activity levels observed in the NH controls, despite trends in this direction. However, in the speech experiment, the less experienced CI group showed an abnormal shift of activity to the right hemisphere not observed in the other groups.

Conclusions:

These results hence imply that adaptation to CI-based hearing is not characterised by a gradual increase of activity in left-hemispheric language network, but a reduction of abnormal activity elsewhere.

Die Autorinnen/Autoren geben an, dass kein Interessenkonflikt besteht.