Results 191 to 200 of about 520,684 (243)

Psychophysically measuring the efficiency of rods. [PDF]

J Vis
Rodrigue G, Paris L, Renaud J, Allard R.
europepmc   +1 more source

OCT-Based Retina Assessment Reflects Visual Impairment in Multiple Sclerosis. [PDF]

Invest Ophthalmol Vis Sci
Stolowy N, Gutmann L, Lüpke M, David T, Dorr M, Mayer C, Heesen C, Oertel FC, Lin TY, Paul F, Zimmermann HG, Stellmann JP.   +11 more
europepmc   +1 more source

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Contrast in night vision

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
Adriana Fiorentini, Lamberto Maffei
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Contrast summation in dichoptic vision

Psychological Research, 1983
Two 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, 1991
After 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.
Harriet D. Speed, John Ross
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Contrast discrimination in peripheral vision

Journal of the Optical Society of America A, 1987
Contrast 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.
Gordon E. Legge, Daniel Kersten
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Polarization Contrast Vision in Octopus [PDF]

Journal of Experimental Biology, 1996
ABSTRACT While the ability to analyze polarized light is widespread among animals, its contribution to form vision has not yet been documented. We tested the hypothesis that polarization vision can be used for object discrimination, by training octopuses to distinguish between targets on the basis of the presence or absence of a pattern ...
Nadav Shashar, Thomas W. Cronin
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Contrast masking in human vision

Journal of the Optical Society of America, 1980
Contrast 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 ...
John M. Foley, Gordon E. Legge
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