Results 261 to 270 of about 821,688 (312)
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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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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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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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Visualization system for human mobility analysis
2015 14th RoEduNet International Conference - Networking in Education and Research (RoEduNet NER), 2015City-scale events, such as festivals, sport events, concerts gather thousands of people in different areas of a city. By installing large area Wi-Fi routers which record the presence of people using devices such as smartphones and tables, the density and the movements of the crowds can be estimated and classified.
Adriana Draghici +2 more
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Speed of processing in the human visual system
American Journal of Ophthalmology, 1996How long does it take for the human visual system to process a complex natural image? Subjectively, recognition of familiar objects and scenes appears to be virtually instantaneous, but measuring this processing time experimentally has proved difficult.
S, Thorpe, D, Fize, C, Marlot
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Contrast discrimination by the human visual system
Biological Cybernetics, 1981In vision of everyday scenes, features requiring detection are frequently observed in the presence of suprathreshold background structures. Detection of such features is a contrast discrimination task and is often necessary for the subsequent process of recognition.
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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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The Effects of Atabrine on the Human Visual System
American Journal of Ophthalmology, 1946Atabrine (Quinacrine hydrochloride) is widely used today in the treatment of malaria. A review of the available literature fails to reveal reference to any temporary or permanent effects of this drug upon the human visual system. To this end, a study was undertaken to investigate (a) visual changes with increasing blood-atabrine levels, (b) any ...
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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
Gopathy Purushothaman +2 more
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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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