Abstract
The studies reviewed in this chapter are restricted to those that electrically stimulate the retina. The research studies reviewed in this chapter are further limited to those performed in animal models; the results of human clinical studies are covered in subsequent chapters.
The neural response to electrical stimulation is influenced (potentially) by a large number of stimulation-related variables (Chaps. 6–10). Stimulating electrodes can be constructed in different shapes and sizes and fabricated out of different materials. Arrays of multiple electrodes can be configured in many different arrangements and ultimately positioned on opposite sides of the retina, or even penetrate into the retina. In addition, the phase length, duration, amplitude and/or frequency of stimulus pulses can each vary, some by several orders of magnitude.
The neurobiology of the retina creates additional variables. There are five major classes of retinal neurons and each is a potential target of electrical stimulation. Each class can be subdivided into many different types; the anatomical and biophysical properties of each can vary considerably. Therefore, the response to electrical stimulation may also vary across types. Since each type is thought to convey different features of the visual world, stimulation methods that do not activate all types appropriately may not convey some or all of the important features of the visual scene.
Systematic study of the interactions between all engineering and neurobiological variables requires an extensive matrix of experiments. As a result, many basic questions remain unexplored. Here, we will focus on the experimental studies that have yielded the more important insights into either the mechanism by which retinal neurons respond to electrical stimulation or those that have led to improved stimulation methods. The final section of this chapter is devoted to a discussion of some important, unanswered questions.
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- AMD:
-
Age-related macular degeneration
- AP4:
-
2-Amino-4-phosphonobutyric acid
- CNQX:
-
6-Cyano-7-nitroquinoxaline-2,3-dione
- DS:
-
Directionally selective
- EECP:
-
Electrically elicited cortical potentials
- LED:
-
Local edge detector
- LFP:
-
Local field potential
- MK801:
-
(+)-5-Methyl-10,11-dihydro-5H-dibenzo[a,d]cyclohepten-5,10-imine maleate
- NBQX:
-
2-3-Dioxo-6-nitro-1,2,3,4-tetrohydrobenzo[f]quinoxaline-7-sulfonamide
- RCS:
-
Royal College of Surgeons
- Rd1:
-
Retinal degeneration 1
- RGC:
-
Retinal ganglion cell
- RP:
-
Retinitis pigmentosa
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Fried, S.I., Jensen, R.J. (2011). The Response of Retinal Neurons to Electrical Stimulation: A Summary of In Vitro and In Vivo Animal Studies. In: Dagnelie, G. (eds) Visual Prosthetics. Springer, Boston, MA. https://doi.org/10.1007/978-1-4419-0754-7_12
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