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Electrical stimulation in isolated rabbit retina.

Jeng-Shyong Shyu1, Mauricio Maia, James D Weiland

  • 1Wilmer Ophthalmological Institute, Johns Hopkins University, Baltimore, MD 21287, USA.

IEEE Transactions on Neural Systems and Rehabilitation Engineering : a Publication of the IEEE Engineering in Medicine and Biology Society
|October 3, 2006
PubMed
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Stimulating electrode size and position significantly impact electrical stimulation of rabbit retinas. Shorter pulse durations require less charge, crucial for developing retinal prostheses.

Area of Science:

  • Neuroscience
  • Biomedical Engineering
  • Ophthalmology

Background:

  • Developing effective retinal prostheses requires understanding how electrical stimulation parameters influence neural responses.
  • Previous research has explored various stimulation strategies, but optimal parameter selection remains a challenge.

Purpose of the Study:

  • To investigate the effects of stimulating electrode size, position, and waveform pulse duration on electrically elicited ganglion cell action potentials in isolated rabbit retinas.
  • To identify optimal stimulation parameters for potential use in retinal prostheses.

Main Methods:

  • Isolated rabbit retinas (n=38) were stimulated using bipolar electrodes (125 or 25 micrometers) placed on the ganglion or photoreceptor side.
  • Cathodic-first, biphasic, current waveforms with pulse durations of 0.1, 0.5, and 1 ms were employed.

Related Experiment Videos

  • Threshold currents were recorded for different electrode configurations and pulse durations.

    • Main Results:

    • Threshold currents varied from 6.7 to 23.6 microA depending on electrode position and pulse duration.
    • No significant difference in threshold currents was observed between electrode sizes (125 vs. 25 micrometers) at a 1-ms pulse duration.
    • Longer pulse durations (1 ms) generally resulted in lower threshold currents compared to shorter durations (0.1 ms), though shorter pulses utilized less charge.

    Conclusions:

    • Electrode size and position are critical factors influencing the efficacy of electrical stimulation for eliciting retinal responses.
    • Pulse duration affects both the required current and charge, offering trade-offs for retinal prosthesis design.
    • These findings provide valuable data for optimizing stimulation parameters in the development of electronic retinal prostheses.