over 219000 profoundly hearing-impaired people. CIs attempt to
stimulate the survival Auditory Nerve (AN) fibers directly by means of
electrical pulses. Electrical stimulation is provided via an array of
electrodes implanted inside the cochlea, which directly activates the
AN fibers by means of biphasic Symmetric (SYM) pulses, i.e.an ...
Supra-Threshold Electrically Evoked Auditory Steady-State Responses In Cochlear Implant Users KU Leuven
Cochlear implants (CIs) restore audition to the profoundly deaf by directly stimulating the auditory nerve. For accurate speech perception, incoming sound must be encoded in a meaningful way, and transmitted along the auditory pathway. CIs encode speech by modulating the amplitude of pulse train sequences, this thesis investigates neural responses to amplitude modulated stimuli in the CI population.
Envelope coding strategies facilitate ...
In this research, we study the mechanism for monaural edge pitch (MEP) generated by band-limited noise. We found that 1) Auditory nerve (AN) fibers with characteristic frequency (CF) near the edge frequency of the broadband noise stimuli show a periodicity in their inter-spike intervals (ISI) which is close to the edge frequency. 2) This dominant periodicity shows trend that are similar to MEP measured psychoacoustically. It is most ...
Design and evaluation of stimulation artifact suppression algorithms in EEG data, for electrically evoked auditory steady-state responses (EASSR) based on testing in cochlear implant users KU Leuven
Cochlear implants (CIs) aim to restore hearing in severely to profoundly deaf adults, children and infants. Electrically evoked auditory steady-state responses (EASSRs) are neural responses to continuous modulated CI pulse trains, and can be objectively detected at the modulation frequency in the electro-encephalogram (EEG). EASSRs can, e.g., potentially be used to determine appropriate stimulation levels during CI fitting, without behavioral ...
Development of a unified sound processing strategy for combined electric and acoustic auditory stimulation KU Leuven
A hearing aid restores hearing by sound amplification, while a cochlear implant is surgically implanted and restores hearing by electrical stimulation of the auditory nerve. An increasingly common solution to severe hearing loss is a "bimodal system": a cochlear implant in one ear and a hearing aid in the other. By giving the ability to hear with two ears – so-called "binaural hearing" – this set-up could in theory allow its users to figure ...
Development of a unified speech processing strategy for combined electric and acoustic auditory stimulation. KU Leuven
Auditory brainstem implantation and language development University of Antwerp
Hearing depends on eardrum vibrations, which typically follow a complicated pattern that is the sum of many vibration patterns of different sound sources and their echos. A fascinating but illunderstood feature of hearing is that it can disentangle and interpret this summed pattern so that we perceive the original sound sources rather than a blur. For example, we hear the different instruments in the sound of an orchestra despite the strong ...
Portable Hearing Diagnostics: Monitoring of Auditory-nerve Integrity after Noise Exposure (EarDiMon) Ghent University
We investigate the effect of noise exposure on individual recovery/damage of auditory-nerve integrity as an early marker for noise-induced hearing loss. We develop a low-power, unobtrusive auditory EEG technology that quantifies and monitors auditory-nerve integrity to study this presently unknown
relationship. Our technology opens up new avenues for auditory EEG based hearing diagnostics, damage prevention and treatment follow up.