Journal ArticleDOI
Cat cones have rod input: A comparison of the response properties of cones and horizontal cell bodies in the retina of the cat
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The rod and cone fields of horizontal cell bodies were found to be nearly coextensive in space, arguing against the notion that substantial rod input came from distant, rod‐dominated terminal arborizations.Abstract:
The responses of horizontal cell bodies and cones in the retina of the cat have been studied by means of intracellular recording and Procion dye injection in an isolated, arterially perfused eyecup preparation. Comparison of the hyperpolarizing responses of these units to red and blue stimuli of different intensities indicated that all morphological varieties of horizontal cells and, additionally, cones themselves, had mixed rod and cone input. The rod input into horizontal cell bodies is thus explained on the basis of cone physiology. The half-saturating intensity of 441 nm stimuli for the rod input into cones and horizontal cells was about 400 quanta/mum2/sec and about 160,000 quanta/mum2/sec for the cone input. Little of this difference can be related to the different quantum catching abilities of rods and cones. The spatial properties of horizontal cell bodies and cones have been characterized using stimuli consisting of long slits in conjunction with a continuous cable model. Space constants for horizontal cells ranged from 210 mum to 410 mum, whereas those for cones ranged from 50 mum, or possibly less, to 180 mum. It is argued that horizontal cell bodies of the cat retina form electrical networks, and that the sizes of the receptive fields generated in these networks may be limited by the diameters of the primary and secondary dendrites of horizontal cells. The rod and cone fields of horizontal cell bodies were found to be nearly coextensive in space, arguing against the notion that substantial rod input came from distant, rod-dominated terminal arborizations.read more
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References
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Journal ArticleDOI
The contrast sensitivity of retinal ganglion cells of the cat.
TL;DR: Spatial summation within cat retinal receptive fields was studied by recording from optic‐tract fibres the responses of ganglion cells to grating patterns whose luminance perpendicular to the bars varied sinusoidally about the mean level.
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Organization of the retina of the mudpuppy, Necturus maculosus. II. Intracellular recording.
Frank S. Werblin,John E. Dowling +1 more
TL;DR: The intracellularly recorded response characteristics of each type of neuron in a vertebrate retina are described, and the response of each neuron to the responses of those neurons to which it is synaptically coupled are related.
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Branching dendritic trees and motoneuron membrane resistivity.
TL;DR: The numerical result is an estimated range of membrane resistivity values for mammalian motoneurons, and a corresponding set of values for the dendritic to soma conductance ratio, significantly greater than those currently accepted in the literature.
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S‐potentials from colour units in the retina of fish (Cyprinidae)
K. I. Naka,W. A. H. Rushton +1 more
TL;DR: S‐potentials recorded from the excised tench retina left undisturbed in the optic cup show colour cells of the two types originally described by Svaetichin & MacNichol (1958).
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Receptive fields of cones in the retina of the turtle.
TL;DR: Intracellular recordings have been made of the responses to light of single cones in the retina of the turtle and the shape of the hyperpolarizing response to a flash depends on the pattern of retinal illumination as well as the stimulus intensity.
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