Journal ArticleDOI
Contours and Contrast: Responses of Monkey Lateral Geniculate Nucleus Cells to Luminance and Color Figures
TLDR
The lateral inhibitory mechanisms found in the retina and geniculate can account for luminance border enhancement, but not entirely for simultaneous brightness or color contrast, for which other cortical processes of some sort must be responsible.Abstract:
The responses of single units in the monkey lateral geniculate nucleus to different portions of figures which differed from their backgrounds in color and brightness were examined. Border enhancement was found in the response to luminance figures but not in the response to color figures. In addition, cells showed border enhancement only in the case of a figure which produced an increment (as opposed to a decrement) in their firing rates. In situations in which very striking brightness contrast is seen perceptually, the cells do not show the corresponding changes in firing rate across the whole pattern. The lateral inhibitory mechanisms found in the retina and geniculate can thus account for luminance border enhancement, but not entirely for simultaneous brightness or color contrast, for which other cortical processes of some sort must be responsible.read more
Citations
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Journal ArticleDOI
Quantitative studies in retinex theory a comparison between theoretical predictions and observer responses to the “color mondrian” experiments
TL;DR: A model for color sensations is described that computes three reflectances from the wavelength-radiance distribution without reflectance or illumination standards: hence, it is able to predict the color sensations seen by the observer.
Journal ArticleDOI
Color in the cortex: single- and double-opponent cells.
Robert Shapley,Michael J. Hawken +1 more
TL;DR: The re-evaluation of the important role of V1 in color vision was caused in part by investigations of human V1 responses to color, measured with functional magnetic resonance imaging, fMRI, and by the results of numerous studies of single-unit neurophysiology in non-human primates.
Journal ArticleDOI
The Representation of Brightness in Primary Visual Cortex
TL;DR: A significant percentage of neurons in primary visual cortex were shown to respond in a manner correlated with perceived brightness, rather than responding strictly to the light level in the receptive fields of the cells, suggesting that even at the first stage of visual cortical processing, spatial integration of information yields perceptual qualities that are only indirectly related to the pattern of illumination of the retina.
Journal ArticleDOI
Spatial mapping of monkey V1 cells with pure color and luminance stimuli.
TL;DR: It is shown that the vast majority of primate striate cells respond to pure color stimuli, in addition to responding to luminance-varying stimuli, and in general, simple cells are color-selective whereas complex cells response to multiple color regions.
Journal ArticleDOI
A multiscale spatial filtering account of the White effect, simultaneous brightness contrast and grating induction
TL;DR: An oriented DOG (ODOG) model is introduced which differs from the DOG model in that the filters are anisotropic and their outputs are pooled nonlinearly and argues strongly that the induced brightness phenomena of SBC, GI, the White effect and the Todorovic demonstration, primarily reflect early-stage cortical filtering operations in the visual system.
References
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Journal ArticleDOI
Analysis of response patterns of LGN cells.
TL;DR: Comparisons with psychophysical data indicated that nonopponent cells transmit brightness information; opponent cells, however, carry information about color, the hue of a light being determined by the relative responses of the four types.
Journal ArticleDOI
The Disappearance of Steadily Fixated Visual Test Objects
TL;DR: A system has been devised for causing an image to remain at one point on the retina regardless of eye movements, and when first presented, the finest lines are seen with normal or slightly better than normal acuity.
Journal ArticleDOI
Size-detecting mechanisms in human vision.
Allan Pantle,Robert Sekuler +1 more
TL;DR: The results suggest that the human visual system contains several different classes of size detectors, each maximally sensitive to visual targets with sizes in a particular range.
Journal ArticleDOI
The responses of limulus optic nerve fibers to patterns of illumination on the receptor mosaic
Floyd Ratliff,H. K. Hartline +1 more
TL;DR: The diminution of inhibitory influences with distance is sufficiently uniform that patterns of neural response generated by various patterns of illumination on the receptor mosaic can be predicted qualitatively.
Journal ArticleDOI
Spatiotemporal chromaticity discrimination.
TL;DR: The experiments indicate that no resonance phenomena occur in the spatiotemporal color-discrimination system of the eye, and show that the threshold chromatic contrast is proportional to the square root of the illuminance.
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