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Related Experiment Video

Updated: Sep 11, 2025

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Towards a closed loop retinal prosthesis: measuring electrically evoked retinal responses using large electrodes.

Martin J Spencer1, Suzanne Hosie1, Wei Tong2,3

  • 1Department of Biomedical Engineering, The University of Melbourne, Parkville, Victoria, Australia.

Journal of Neural Engineering
|August 18, 2025
PubMed
Summary
This summary is machine-generated.

Researchers explored using large stimulating electrodes in retinal prostheses to record neural responses. This finding is crucial for developing closed-loop stimulation strategies to improve vision restoration.

Keywords:
closed loopcompound action potentialneural stimulation artifactretinal implantstimulation strategiessuprachoroidal

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Area of Science:

  • Neuroscience
  • Biomedical Engineering
  • Ophthalmology

Background:

  • Sensory prostheses aim to restore vision or hearing via neural stimulation.
  • Current stimulation methods cause overlapping neural activation, leading to perceptual deficits.
  • Closed-loop stimulation requires measuring neural responses to optimize prosthesis function.

Purpose of the Study:

  • To investigate the feasibility of using large stimulating electrodes in retinal implants for recording neural responses.
  • To adapt techniques similar to Evoked Compound Action Potential measurements used in cochlear implants for retinal prostheses.

Main Methods:

  • Utilized ex vivo retinal tissue from Long Evans and Royal College of Surgeon rats.
  • Employed a hexagonal array of 20 platinum electrodes (500 μm diameter, 700 μm pitch).
  • Optimized stimulation pulses and filtering, and used blockers to confirm biological signal origin.

Main Results:

  • Observable neural signals were detected on electrodes distant from the stimulating ones.
  • Signals likely resulted from direct activation of retinal ganglion cells or inner retinal neurons.
  • Successful recording of neural signals from large electrodes was demonstrated.

Conclusions:

  • Recording usable neural signals from large electrodes is feasible for retinal prostheses.
  • This capability is essential for implementing closed-loop stimulation strategies.
  • The findings support the development of more effective visual prostheses.