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Archives of Ophthalmology (Chicago,... Jun 1964
Review
Topics: Adaptation, Ocular; Color Perception; Electroretinography; Eye; Eye Movements; Flicker Fusion; Humans; Motion Perception; Physiology; Refraction, Ocular; Retina; Vision, Ocular; Visual Perception
PubMed: 14133881
DOI: 10.1001/archopht.1964.00970010905026 -
Current Biology : CB Oct 2004Visual attention is attracted by salient stimuli that 'pop out' from their surroundings. Attention can also be voluntarily directed to objects of current importance to... (Review)
Review
Visual attention is attracted by salient stimuli that 'pop out' from their surroundings. Attention can also be voluntarily directed to objects of current importance to the observer. What happens in the brain when these two processes interact?
Topics: Attention; Color Perception; Humans; Models, Psychological; Pattern Recognition, Visual; Time Factors; Visual Fields; Visual Pathways; Visual Perception
PubMed: 15458666
DOI: 10.1016/j.cub.2004.09.041 -
Nature May 2022
Topics: Neurons; Visual Perception
PubMed: 35590062
DOI: 10.1038/d41586-022-01212-1 -
Biological Cybernetics 1981In this paper we propose a model of visual perception in which a positive feedback mechanism can reproduce the pattern stimulus on a neurons screen. The pattern stimulus...
In this paper we propose a model of visual perception in which a positive feedback mechanism can reproduce the pattern stimulus on a neurons screen. The pattern stimulus reproduction is based on informations coming from the spatial derivatives of visual pattern. This information together with the response of the feature extractors provides to the reproduction of the visual pattern as neuron screen electric activity. We simulate several input patterns and prove that the model reproduces the percept.
Topics: Computers; Models, Neurological; Visual Perception
PubMed: 7236747
DOI: 10.1007/BF00336733 -
M.D. Computing : Computers in Medical... 1994
Review
Topics: Adult; Humans; Infant; Mental Processes; Optical Illusions; Pattern Recognition, Visual; Reference Values; Size Perception; Visual Perception
PubMed: 8145633
DOI: No ID Found -
Proceedings. Biological Sciences May 2002We sought to determine the extent to which red-green, colour-opponent mechanisms in the human visual system play a role in the perception of drifting luminance-modulated...
We sought to determine the extent to which red-green, colour-opponent mechanisms in the human visual system play a role in the perception of drifting luminance-modulated targets. Contrast sensitivity for the directional discrimination of drifting luminance-modulated (yellow-black) test sinusoids was measured following adaptation to isoluminant red-green sinusoids drifting in either the same or opposite direction. When the test and adapt stimuli drifted in the same direction, large sensitivity losses were evident at all test temporal frequencies employed (1-16 Hz). The magnitude of the loss was independent of temporal frequency. When adapt and test stimuli drifted in opposing directions, large sensitivity losses were evident at lower temporal frequencies (1-4 Hz) and declined with increasing temporal frequency. Control studies showed that this temporal-frequency-dependent effect could not reflect the activity of achromatic units. Our results provide evidence that chromatic mechanisms contribute to the perception of luminance-modulated motion targets drifting at speeds of up to at least 32 degrees s(-1). We argue that such mechanisms most probably lie within a parvocellular-dominated cortical visual pathway, sensitive to both chromatic and luminance modulation, but only weakly selective for the direction of stimulus motion.
Topics: Adaptation, Ocular; Color Perception; Contrast Sensitivity; Female; Humans; Light; Male; Motion Perception; Photic Stimulation; Visual Perception
PubMed: 12028757
DOI: 10.1098/rspb.2002.1985 -
Perception 1977The problem about visual discrimination between seeing objects in motion and perception of motion of the perceiver (locomotion) was taken up. A flow of vertical motion...
The problem about visual discrimination between seeing objects in motion and perception of motion of the perceiver (locomotion) was taken up. A flow of vertical motion was presented to limited areas of the far periphery (45 degrees-90 degrees) of the retina simultaneously with optical information about a stationary room over the rest of the retina. The result was that most subjects perceived themselves as sitting in an elevator continuously moving upward or downward. Thus, peripheral motion stimulation over a few percent of the retinal area determines locomotion perception in apparent competition with information about a static state over the rest of the retina. The same type of stimulus presented to the central part of the retina always brought about perception of object motion and a static perceiver. Effects of size and localization of the area stimulated with the motion flow was studied. Theoretical consequences and problems for further experimental analyses are discussed.
Topics: Discrimination, Psychological; Humans; Locomotion; Motion Perception; Orientation; Reaction Time; Retina; Visual Fields; Visual Perception
PubMed: 917725
DOI: 10.1068/p060365 -
Psychological Research 1980
Topics: Adaptation, Ocular; Female; Humans; Male; Retina; Visual Fields; Visual Perception
PubMed: 7394119
DOI: 10.1007/BF00308875 -
Nature Mar 1980It is well known that the visual system summates signals over time, about 120 ms in daylight. Although this summation has the obvious advantage of enhancing visual...
It is well known that the visual system summates signals over time, about 120 ms in daylight. Although this summation has the obvious advantage of enhancing visual sensitivity, it creates the potential problem of motion smear when viewing moving targets, whose images are also summated over time. Here I report some measurements which reveal that provided the moving target is exposed for long enough to elicit a clear sensation of motion, the amount of smear is far less than may be expected. This suggests that the visual mechanisms which signal motion are also responsible for signalling a clear unsmeared perception of the target in motion.
Topics: Form Perception; Humans; Motion Perception; Retina; Visual Fields; Visual Perception
PubMed: 7360241
DOI: 10.1038/284164a0 -
Perceptual and Motor Skills Jun 1977A direct-realist account of visual sensation is outlined. The explanatory notion of elements in visual sensation (atomic sensations) is reinterpreted, and the suggested...
A direct-realist account of visual sensation is outlined. The explanatory notion of elements in visual sensation (atomic sensations) is reinterpreted, and the suggested interpretation is formally justified by constructing a Boolean algebra for visual sensations. The related notion of sensory levels (visual field vs visual world) is discussed.
Topics: Color Perception; Concept Formation; Humans; Mathematics; Optical Illusions; Pattern Recognition, Visual; Visual Perception
PubMed: 887374
DOI: 10.2466/pms.1977.44.3c.1191