• Publications
  • Influence
Uncertainty about spatial frequency, spatial position, or contrast of visual patterns
Prevalent theories of pattern vision postulate mechanisms selectively sensitive to spatial frequency and position but not to contrast. Decreased performance in the detection of visual stimuli wasExpand
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Human Perception and Performance in 3D Virtual Environments
Virtual environments have the potential to become very significant tools both in the civilian and military sectors. They offer a new human-computer interface in which users actively participate andExpand
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Spatial frequency uncertainty effects in the detection of sinusoidal gratings
Abstract A sinusoidal grating is less detectable when it is randomly intermixed in a block of trials with gratings of other spatial frequencies than when it is the only grating presented in a blockExpand
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Allocation of attention: Uncertainty effects when monitoring one or two visual gratings of noncontiguous spatial frequencies
  • E. Davis
  • Psychology, Medicine
  • Perception & psychophysics
  • 1 November 1981
When an observer is visually presented with a sinusoidal grating, he will often do worse in detecting a given grating when he is uncertain about its spatial frequency than when he is certain.Expand
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Comparison of perceived spatial frequency between the fovea and the periphery.
A grating viewed in the periphery usually appears to be of higher frequency than the same grating viewed at the fovea, for frequencies below the Nyquist frequency of the periphery. Systematic shiftsExpand
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Modeling shifts in perceived spatial frequency between the fovea and the periphery.
  • E. Davis
  • Physics, Medicine
  • Journal of the Optical Society of America. A…
  • 1 February 1990
A quantitative multiple-channels model can account for changes in perceived spatial frequency between foveally and peripherally viewed patterns; these frequency shifts are as large as 0.47 octaveExpand
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Presurgical prediction of postsurgical visual acuity in patients with media opacities.
Of the estimated 1 million patients each year in the United States who undergo surgery for media opacities, perhaps 5-10% fail to improve because of pre-existing, undiagnosed retinal and/or opticExpand
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Divided attention and visual search for simple versus complex features
Under what search conditions does attention affect perceptual processes, resulting in capacity limitations, rather than affecting noisy decision-making processes? Does parallel or serial processingExpand
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Mirror-image symmetry and search asymmetry: A comparison of their effects on visual search and a possible unifying explanation
Visual search may be affected by mirror-image symmetry between target and non-targets and also by switching the roles of target and non-target. Do different attention mechanisms underlie these twoExpand
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