Threshold map and the migration of low threshold region with increasing electrode size. In the present study, we found that the M cell coverage factor ranged from 4. This can be converted to a function of cone inner segment eccentricity. Journal of Neuroscience , To do this we compute the spacing at corresponding visual field locations in the two eyes, convert them to densities Equation 2 , compute their mean, and convert back to spacing Equation A4.
Midget retinal ganglion cell soma
New cells were then interpolated among the labeled cells, being placed in the void spaces near the labeled cells, outside the zone defined by the effective radius. Despite the electrode area increasing by the radius squared, the highly effective stimulus region beyond the electrode edge only increased linearly with radius. Equation 15 computes mRGC spacing at locations specified in visual field coordinates in one eye. Journal of the Optical Society of America A , 4 8 , — We have derived a mathematical formula for the density of receptive fields of human retinal ganglion cells as a function of position in the monocular or binocular visual field. Animals Four adult male common marmosets Callithrix jacchus jacchus were used.
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The effects of electrode placement on response propagation along cellular structures. Midget cells make up most but not all of the retinal ganglion cells, and their proportion varies with eccentricity. Schiller, Sandell, and Maunsell Demo: View Original Download Slide. Density, spacing, row spacing, and Nyquist frequency.
The remaining dissection procedures were carried out under infrared light. The agreement is excellent. Indeed, threshold stimuli activated only one cell at most locations. Following progression of neurodegenerative diseases, the retinal ganglion cells RGCs continue to survive in large numbers . Responses of an On RGC cluster following electrical stimulation. The second category of RGCs examined was the small field midget cells unique to primates.