Results 231 to 240 of about 2,548,447 (289)
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Disinhibition in the Human Visual System*
Journal of the Optical Society of America, 1962By the method of binocular photometry, the present experiment has demonstrated that it is possible to reduce the magnitude of simultaneous brightness contrast through an increase in the number of inducing targets presented to an observer. This demonstration is thought to be important for two reasons: (1) it is a perceptual analog of the indirect ...
W R, MACKAVEY, S H, BARTLEY, C, CASELLA
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Visual System Anomalies in Human Ocular Albinos
Science, 1978Visually evoked potentials recorded from two types of human ocular albinos demonstrated significant hemispheric asymmetry following monocular stimulation. The asymmetry is indicative of disorganization of retinogeniculostriate projections similar to that reported for mammals with total albinism.
D, Creel, F E, O'Donnell, C J, Witkop
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Sex differences in the human visual system
Journal of Neuroscience Research, 2016This Mini‐Review summarizes a wide range of sex differences in the human visual system, with a primary focus on sex differences in visual perception and its neural basis. We highlight sex differences in both basic and high‐level visual processing, with evidence from behavioral, neurophysiological, and neuroimaging studies. We argue that sex differences
John E. Vanston, Lars Strother
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The human visual system averages speed information
Vision Research, 1992It has been known for many years that human observers are unable to detect modest accelerations and decelerations in moving visual stimuli. We find that human observers can integrate speeds over many dots, moving at different speeds, producing a global speed percept analogous to the global direction percept first reported by Williams, D. W. and Sekuler,
Watamaniuk, Scott N. J., Duchon, Andrew
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Temporal beats in the human visual system
Vision Research, 1994The human visual system is generally assumed to comprise multiple independent channels tuned to limited ranges of spatial and temporal frequency. However, it is known that spatial beats effectively mask a sinusoidal grating whose spatial frequency coincides with the beat frequency of the mask, even though no Fourier energy exists in the mask at that ...
S T, Hammett, A T, Smith
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Stimulus specificity in the human visual system
Vision Research, 1973Abstract During adaptation to a high contrast grating it gradually seems to fade. A lower-contrast test grating appearing directly after the adapting pattern appears reduced in apparent contrast. The orientation specificity and spatial frequency specificity of thisapparent contrast reduction have been determined by adapting to gratings of various ...
C, Blakemore, J P, Muncey, R M, Ridley
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Task dependency of visual processing in the human visual system
Behavioural Brain Research, 1996In this review we contrast passive, attribute driven processing in the visual system with an active, task-dependent view and summarize the evidence from our Positron Emission Tomography (PET) work supporting the task-dependent view. The PET studies involved comparison of regional Cerebral Blood Flow (rCBF) in closely related detection and ...
G A, Orban +5 more
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Suprathreshold Intrinsic Dynamics of the Human Visual System
Neural Computation, 2003Intrinsic high-frequency neural activities have been observed in the visual system of several species, but their functional significance for visual perception remains a fundamental puzzle in cognitive neuroscience. Spatiotemporal integration in the human visual system acts as a low-pass filter and makes the psychophysical observation of high-frequency
Purushothaman, Gopathy +2 more
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A Visual Hiding Algorithm Based on Human Visual System
Advanced Materials Research, 2014Image information hiding is a way of concealing secret information within another image or file. The previous researches of image information hiding extract secret by calculating. An algorithm based on HVS (Human Visual System) is proposed in this paper.
Rui Dong, Dao Shun Wang
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Human visual-system-based image enhancement
SPIE Proceedings, 2007This paper presents a method of image enhancement using an adaptive thresholding method based on the human visual system. We utilize a number of different enhancement algorithms applied selectively to the different regions of an image to achieve a better overall enhancement than applying a single technique globally. The presented method is useful for
Eric J. Wharton +2 more
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