Electric Acoustic Stimulation


Psychoacoustics in EAS users

  • Investigation of psychoacoustic electric-acoustic masking for combined EAS
  • The effect of ES on acoustic hearing if electric and acoustic stimuli are presented simultaneously.
  • The effect of AS on electric hearing if electric and acoustic stimuli are presented simultaneously.

Schematic drawing of an CI electrode array and some nearby hair cells.

Electrophysiological measurements in EAS users

  • Electrophysiological measurements are used to examine electric-acoustic interaction in EAS users.
  • Telemetry capabilities of the CI systems are used to derive intracochlear electrocochleography in EAS users.
  • Cochlear microphonic (CM) and auditory nerve neurophonic (ANN) potentials, recorded in response to AS, ES, and in response to combined EAS are used to determine peripheral electric-acoustic interaction electrophysiologically.

Schematic drawing of an ECochG measurement.

Sound coding for EAS users

  • Development and evaluation of sound coding for EAS users conveying low-frequency information of speech electrically to improve the speech perception for ES alone.
  • Investigation of EAS fittings to optimize speech perception for EAS users.

Sound coding for EAS users.

Computational modeling for EAS

  • Development of 3D models of the cochlea for ES and EAS
  • Models of neural coding in auditory nerve fibers in response to ES, AS, and EAS
  • Models of electrophysiological responses such as the electrically or acoustically evoked compound action potential to investigate the effect of electric-acoustic interaction on these measures
  • Neural networks to emulate psychoacoustic experiments or speech perception of EAS users in different neural health conditions

Schematic drawing of a cochlear modell.

Binaural fusion of EAS

  • Investigation of central electic acoustic interaction through speech understanding performance and cortical EEG measurements;
  • Investigataion of peripheral electric acoustic interaction through electric-acoustic pitch matching and measurment of auditory brainstem responses;
  • Optimization of the CI fitting using the measurements of central and peripheral electric acoustic interaction.

Abbreviations: ES: electric stimulation AS: acoustic stimulation EAS: electric-acoustic stimulation

Team Members


Head of Research Group:
Prof. Dr.-Ing. Waldo Nogueira

DHZ-Deutsches HörZentrum Hannover
Karl-Wiechert-Allee 3
30625 Hannover
Phone: +49 (0)511 532 8025
Fax: +49 (0)511 532 6833
E-Mail: nogueiravazquez.waldo@mh-hannover.de

About The VIANNA research team