Results 251 to 260 of about 320,340 (290)
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Vision Research, 1973
Abstract Simultaneous contrast has been ascribed so far to spatial interactions in retinal receptive fields. The antagonistic surround of retinal receptive fields disappears after dark adaptation. The present work shows that simultaneous contrast for large fields and border contrast effects are preceived at low scotopic luminances. Moreover, both the
A, Fiorentini, L, Maffei
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Abstract Simultaneous contrast has been ascribed so far to spatial interactions in retinal receptive fields. The antagonistic surround of retinal receptive fields disappears after dark adaptation. The present work shows that simultaneous contrast for large fields and border contrast effects are preceived at low scotopic luminances. Moreover, both the
A, Fiorentini, L, Maffei
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Contrast masking in human vision
Journal of the Optical Society of America, 1980Contrast masking was studied psychophysically. A two-alternative forced-choice procedure was used to measure contrast thresholds for 2.0 cpd sine-wave gratings in the presence of masking sine-wave gratings. Thresholds were measured for 11 masker contrasts spanning three log units, and seven masker frequencies ranging +/- one octave from the signal ...
G E, Legge, J M, Foley
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Contrast discrimination in peripheral vision
Journal of the Optical Society of America A, 1987Contrast discrimination provides a psychophysical method for studying contrast coding in vision. Our purpose was to compare properties of contrast discrimination in central and peripheral vision. We used forced-choice procedures to measure contrast-increment thresholds as a function of pedestal contrast.
G E, Legge, D, Kersten
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Vision in dementia: Contrast effects
Neurological Research, 1996Contrast sensitivity has been shown to be affected in Alzheimer's disease (Ad). We investigated low contrast acuity and contrast sensitivity using clinical test charts in this patient population. Additionally, we tested patients with vascular dementia (vd) and mixed dementia (md), (Alzheimer' with vascular dementia).
V, Lakshminarayanan +4 more
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Contrast summation in dichoptic vision
Psychological Research, 1983Two sinusoidal gratings equal in contrast and either equal or different in spatial frequency, orientation and spatial phase were presented dichoptically. At low contrast, the subjects perceived a fused image of the gratings, no matter how different the spatial frequencies or orientations on the gratings were.
SPINELLI D, CATTANEO, ANTONINO
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Contrast adaptation and contrast masking in human vision
Proceedings of the Royal Society of London. Series B: Biological Sciences, 1991After a preliminary study of visual evoked potentials (VEPS) to a test grating seen in the presence of masks at different orientations, psychophysical data are presented showing the effects of adaptation and of masking on thresholds for detecting the same test grating.
J, Ross, H D, Speed
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Defocused contrast sensitivity function in peripheral vision
Ophthalmic and Physiological Optics, 2021AbstractPurposeHuman peripheral detection performance is affected by optical factors such as defocus and higher order aberrations. From optical theory, we would expect defocus to produce local depressions (notches) in the contrast sensitivity function (CSF).
Durgasri Jaisankar +3 more
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Contrast Sensitivity and Functional Vision
International Ophthalmology Clinics, 2003How well does a person see faces in a crowd, read a newspaper, or drive an automobile at night? These are vital questions about a person's quality of life and safety. Obtaining answers to these questions requires tests of functional vision.
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