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Simulating auditory and visual sensorineural prostheses: a comparative review.

L E Hallum1, G Dagnelie, G J Suaning

  • 1Graduate School of Biomedical Engineering, University of New South Wales, Sydney 2052, Australia.

Journal of Neural Engineering
|February 28, 2007
PubMed
Summary
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This review compares cochlear implants and microelectronic vision prostheses using psychophysics and signal processing. Simulations suggest around 100 electrodes may restore complex vision, aiding the development of artificial sight.

Area of Science:

  • Biomedical Engineering
  • Neuroscience
  • Ophthalmology
  • Signal Processing
  • Psychophysics

Background:

  • Microelectronic vision prostheses aim to restore spatial vision in blind individuals by creating phosphenes via electrode arrays.
  • While analogous to cochlear implants, vision prostheses and cochlear implants are rarely compared, hindering scientific and engineering advancements.
  • Psychophysics and signal processing are crucial for understanding and optimizing vision prosthesis efficacy.

Purpose of the Study:

  • To review and compare psychophysical and signal processing research for cochlear implants and microelectronic vision prostheses.
  • To inform the science and engineering of vision prostheses by drawing parallels with established cochlear implant research.
  • To predict the clinical efficacy of vision prostheses based on psychophysical simulation data.

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Main Methods:

  • Review of psychophysical studies on cochlear implants using acoustic simulations with normally hearing subjects.
  • Analysis of psychophysical simulations involving normal observers viewing stimuli mimicking microelectronic vision prostheses.
  • Examination of signal processing strategies for both auditory and visual prostheses.

Main Results:

  • Cochlear implant simulations highlight the importance of understanding 'artificial' perception in noisy conditions.
  • Vision prosthesis simulations predict that approximately 100 electrodes could enable mobility and complex visual recognition.
  • Fewer electrodes in vision prostheses may suffice for reading and simple visuomanual tasks.

Conclusions:

  • Comparative analysis of cochlear implant and vision prosthesis research offers valuable insights for developing effective artificial vision.
  • Psychophysical simulations are vital for predicting prosthesis performance and guiding electrode number and signal processing strategies.
  • Further research into artificial perception and signal processing is needed to optimize vision prosthesis functionality.