Journal ArticleDOI
Spatial summation and contrast sensitivity of X and Y cells in the lateral geniculate nucleus of the macaque
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TLDR
It is found that in macaque monkeys the magnocellular cells and their cortical projections may be the neural vehicle for contrast vision near threshold, and the cells of the parvocellular laminae seem to be primarily concerned with wavelength discrimination and patterns of colour.Abstract:
Study of parallel processing in the visual pathway1 of the cat has revealed several classes of retinal ganglion cells which are physiologically distinct and which project to various locations in the brain2,3. Two classes have been studied most extensively: X cells, which sum neural signals linearly over their receptive fields, and Y cells, in which the spatial summation is nonlinear1,4. In the cat's lateral geniculate nucleus (LGN) cells also can be classified as X or Y, a result of the parallel projection of retinal X and Y inputs to different geniculate neurones5–9. We report here our study of parallel signal processing in the LGN of the macaque monkey. We find that (1) monkey LGN cells can be classified as X or Y on the basis of spatial summation; (2) X-like cells are found in the four parvocellular and the two magnocellular laminae, whereas Y-like cells are found almost exclusively in the magnocellular laminae; and (3) the cells of the magnocellular laminae have high sensitivity and the parvocellular cells low sensitivity for homochromatic patterns. This implies that in macaque monkeys the magnocellular cells and their cortical projections may be the neural vehicle for contrast vision near threshold. The cells of the parvocellular laminae seem to be primarily concerned with wavelength discrimination and patterns of colour. As the human visual system is similar to that of the macaque in structure and behavioural performance, our findings are probably also applicable to man.read more
Citations
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Journal ArticleDOI
Segregation of form, color, movement, and depth: anatomy, physiology, and perception
TL;DR: Perceptual experiments can be designed to ask which subdivisions of the system are responsible for particular visual abilities, such as figure/ground discrimination or perception of depth from perspective or relative movement--functions that might be difficult to deduce from single-cell response properties.
Journal ArticleDOI
How parallel are the primate visual pathways
TL;DR: This proposal that the cortical and subcortical pathways are continuous, so that distinct channels of information that arise in the retina remain segregated up to the highest levels of visual cortex has far-reaching implications for the understanding of the functional organization of the visual system.
Journal ArticleDOI
Anatomy and physiology of a color system in the primate visual cortex.
TL;DR: The results suggest that a system involved in the processing of color information, especially color-spatial interactions, runs parallel to and separate from the orientation-specific system.
Journal ArticleDOI
Concurrent processing streams in monkey visual cortex
Edgar A. DeYoe,D. C. Van Essen +1 more
TL;DR: It is suggested that many aspects of perception involve significant overlap across a number of paths and cortical areas.
Journal ArticleDOI
The primate retina contains two types of ganglion cells, with high and low contrast sensitivity
Ehud Kaplan,Robert Shapley +1 more
TL;DR: It is reported that the parallel analysis of color and luminance in the visual scene begins in the retina, probably at a retinal site distal to the ganglion cells.
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.
Journal ArticleDOI
Spatial and chromatic interactions in the lateral geniculate body of the rhesus monkey.
Torsten N. Wiesel,D. H. Hubel +1 more
TL;DR: The opponent principle, in which spatially separated excitatory and inhibitory regions are pitted against each other, has now been observed for retinal ganglion cells in the frog, the lizard, the rabbit, the rat, the ground squirrel, and the monkey.
Journal ArticleDOI
Sustained and transient neurones in the cat's retina and lateral geniculate nucleus.
TL;DR: Cat retinal ganglion cells may be subdivided into sustained and transient response‐types by the application of a battery of simple tests based on responses to standing contrast, fine grating patterns, size and speed of contrasting targets, and on the presence or absence of the periphery effect.
Journal ArticleDOI
Functional specificity of lateral geniculate nucleus laminae of the rhesus monkey
TL;DR: This study investigated the functional specificity of the lateral geniculate mucleus (LGN) of the rhesus monkey using microelectrode-recording techniques and found blue-selective cells are found predominantly in the ventral pair of parvocellular layers.
Related Papers (5)
Spatial and temporal contrast sensitivities of neurones in lateral geniculate nucleus of macaque.
Spatial and chromatic interactions in the lateral geniculate body of the rhesus monkey.
Torsten N. Wiesel,D. H. Hubel +1 more
The primate retina contains two types of ganglion cells, with high and low contrast sensitivity
Ehud Kaplan,Robert Shapley +1 more