Infrared Neural Stimulation Of The Cochlear Nucleus: Towards A New Generation Of Auditory Brainstem Implants

  • Rohit Verma

Student thesis: Doctor of Medicine


In an effort to improve the auditory brainstem implant, a prosthesis in which user outcomesare modest, infrared neural stimulation (INS) was applied to the cochlear nucleus in a ratanimal model. Pulsed INS, delivered to the surface of the cochlear nucleus via an opticalfibre, evoked auditory brainstem responses (ABR) and generated broad neural activation inthe inferior Colliculus (IC). Varying the parameters of the laser stimulation revealed laserpeak power to be the dominating parameter for both ABR and IC responses. Strongestresponses were recorded when the fibre was placed at lateral positions on the cochlearnucleus, close to the temporal bone. After deafening by auditory nerve section, ABR andIC responses to INS disappeared, consistent with a reported "optophonic" effect, a laser-inducedacoustic artifact. Thus, for deaf individuals who use the auditory brainstemimplant, INS alone does not appear promising as a new approach.
Date of Award31 Dec 2014
Original languageEnglish
Awarding Institution
  • The University of Manchester
SupervisorColette Mckay (Supervisor), Andrew King (Supervisor) & Simon Lloyd (Supervisor)


  • Hearing rehabilitation
  • Neurofibromatosis type 2
  • Neuroprosthesis
  • Auditory Brainstem Implant
  • Infrared Neural Stimulation
  • Cochlear Nucleus

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