Cited by 145Neuroscience and Neural EngineeringRetinal Development and DisordersAnalog and Mixed-Signal Circuit Design

Thresholds for Activation of Rabbit Retinal Ganglion Cells with an Ultrafine, Extracellular Microelectrode

Jensen, Ralph J., Rizzo, Joseph F., Ziv, Ofer R., Grumet, Andrew, Wyatt, John·2003·Investigative Opthalmology & Visual Science

Abstract

PURPOSE: To determine electrical thresholds required for extracellular activation of retinal ganglion cells as part of a project to develop an epiretinal prosthesis. METHODS: Retinal ganglion cells were recorded extracellularly in retinas isolated from adult New Zealand White rabbits. Electrical current pulses of 100- micro s duration were delivered to the inner surface of the retina from a 5- micro m long electrode. In about half of the cells, the point of lowest threshold was found by searching with anodal current pulses; in the other cells, cathodal current pulses were used. RESULTS: Threshold measurements were obtained near the cell bodies of 20 ganglion cells and near the axons of 19 ganglion cells. Both cathodal and anodal stimuli evoked a neural response in the ganglion cells that consisted of a single action potential of near-constant latency that persisted when retinal synaptic transmission was blocked with cadmium chloride. For cell bodies, but not axons, thresholds for both cathodal and anodal stimulation were dependent on the search method used to find the point of lowest threshold. With search and stimulation of matching polarity, cathodal stimuli evoked a ganglion cell response at lower currents (approximately one seventh to one tenth axonal threshold) than did anodal stimuli for both cell bodies and axons. With cathodal search and stimulation, cell body median thresholds were somewhat lower (approximately one half) than the axonal median thresholds. With anodal search and stimulation, cell body median thresholds were approximately the same as axonal median thresholds. CONCLUSIONS: The results suggest that cathodal stimulation should produce lower thresholds, more localized stimulation, and somewhat better selectivity for cell bodies over axons than would anodal stimulation.

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Crossref · 10.1167/iovs.02-1041

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Authors
Jensen, R. J., Rizzo, J. F., Ziv, O. R., Grumet, A., & Wyatt, J.
Affiliations
  • VA Boston Healthcare System (US)
  • Massachusetts Eye and Ear Infirmary (US)
  • Massachusetts Institute of Technology (US)
Venue
Investigative Opthalmology & Visual Science
Published
2003-08-01
Volume
44
Issue
8
Pages
3533
ISSN
  • 0146-0404 (ISSN-L)
  • 1552-5783
OpenAlex
W2054078179
Cited by
145
References
25
Citations by year
2025: 3 · 2024: 2 · 2023: 1 · 2022: 4 · 2021: 6 · 2020: 6 · 2019: 3 · 2018: 6 · 2017: 5 · 2016: 4 · 2015: 7 · 2014: 10 · 2013: 8 · 2012: 6
FWCI
2.63
Type
journal article
Language
en
Open access
closed
Locations
  • Investigative Ophthalmology & Visual Science (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neural Engineering
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Retinal Development and Disorders
  • Physical Sciences › Engineering › Biomedical Engineering › Analog and Mixed-Signal Circuit Design
Keywords
retinal ganglion cells, electrical stimulation threshold, epiretinal prosthesis, cathodal stimulation, anodal stimulation, action potential latency, cadmium chloride, rabbit retina
MeSH terms
Action Potentials, Animals, Axons, Electrophysiology, Microelectrodes, Neural Conduction, Neurons, Rabbits, Retinal Ganglion Cells, Sensory Thresholds

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