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The oblique effect with colour defined motion throughout the visual field
1999
Vision Research
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We assessed the extent of the oblique effect (OE) and the meridional orientation effect (MOE) for a chromatic motion task using red/green gratings throughout an 80°visual field. ...
The present study confirmed our previous results on chromatic motion sensitivity and isoluminance ratios throughout the visual field. ...
A partial report was presented at the ARVO annual meeting, 1995 (IOVS, 36(4), 267). We thank Kamelia Petrova, Vasile Diaconu, and Yen Vo for participating in this study. ...
doi:10.1016/s0042-6989(98)00124-2
pmid:10341962
fatcat:h5yeklf7qnf4rkmuxl2uatc3ve
Effects of contrast and temporal frequency on orientation discrimination for luminance and isoluminant stimuli
1998
Vision Research
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We compared the mechanisms responsible for orientation discrimination of stimuli defined by luminance and red/green isoluminant contrast. ...
In contrast to previous work, we found a marked "oblique-effect" for both luminance and isoluminant gratings, when measuring discrimination thresholds as a function of standard orientation. ...
To compare the effectiveness of luminance and chromatic stimuli we normalized the contrasts to an absolute cone-contrast scale by calculating the rootmean-squared contrast in the L-and M-cones: RMS = sqrt ...
doi:10.1016/s0042-6989(97)00240-x
pmid:9666970
fatcat:redkz6mml5fhfhcnfml7u5g4wm
Page 1260 of Psychological Abstracts Vol. 61, Issue 6
[page]
1979
Psychological Abstracts
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—Contrast thresholds were measured for vertical and oblique grating patterns. As shown previously, at higher spatial frequencies sensitivity for vertical is much greater than that for oblique. ...
Moreover, when contrast thresholds were based on the perception of flicker, vertical and oblique sensitivities were essentially identical even at low flicker rates. ...
Luminance and chromatic cues in a spatial integration task
2001
Vision Research
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These experiments explore the way in which cues provided by luminance and chromatic contrast interact in the spatial integration of elements. ...
The elements were placed so that when experimentally manipulating the separations between the lines, subjects could generate an oriented percept from the elements sharing luminance or chromaticity. ...
(DGICY) of the Ministry of Education and Science of Spain. ...
doi:10.1016/s0042-6989(01)00182-1
pmid:11712984
fatcat:5odeg2z2ubgqpjxjdfv7pod6di
Orientation perception anisotropies indicate functional segregation within the color system
2015
Journal of Vision
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In two contrast detection experiments and an orientation discrimination experiment, we investigated whether the radial bias effect also exists for chromatic stimuli. ...
In agreement with previous results, we also found distinct sensitivity distributions for red-green and blue-yellow signals as a function of eccentricity. ...
The authors would like to thank the reviewers for their helpful comments/suggestions. *DCK and CvL are co-senior authors of this article. ...
doi:10.1167/15.9.13
pmid:26223025
fatcat:hxqtfodwkrgybhtcyvhvupbh2e
Orientation tuning of binocular summation: a comparison of colour to achromatic contrast
2016
Scientific Reports
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Here we measure the orientation tuning of binocular summation for chromatic and equivalent achromatic contrast. ...
These results suggest that similar, oriented processes underlie both chromatic and achromatic binocular contrast combination. ...
Detection thresholds were obtained for left oblique gratings, right oblique gratings, and dichoptic pairs for each orientation difference in all conditions (Chromaticity (2) × SF (2) × orientation (8) ...
doi:10.1038/srep25692
pmid:27168119
pmcid:PMC4863369
fatcat:2k7wdihk2nglbnjchmue3fqimm
Orientation and spatial-frequency discrimination for luminance and chromatic gratings
1990
Optical Society of America. Journal A: Optics, Image Science, and Vision
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This difference in the color and luminance discrimination thresholds may reflect somewhat coarser orientation and spatial-frequency selectivity in the mechanisms encoding the chromatic patterns. ...
of constant short-wavelength-sensitive cone excitation (so that they could be detected on the basis of opposing activity in only the long-and medium-wavelength-sensitive cones). ...
Geisler for making available the programs used to calculate the predictions for his ideal ob- ...
doi:10.1364/josaa.7.001034
pmid:2362227
fatcat:oknpjocjtrb23celeeilbcuyte
Optical and neural anisotropy in peripheral vision
2016
Journal of Vision
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In the fovea, the visual system shows higher sensitivity for cardinal over diagonal orientations, which is referred to as the oblique effect. ...
Similarly, the average ratio of horizontal to vertical contrast sensitivity with full optical correction at 08, 108, and 208 was 0.99 6 0.15, 1.28 6 0.28 and 1.75 6 0.80, respectively. ...
Address: The Institute of Optics, Rochester, NY, USA. ...
doi:10.1167/16.5.1
pmid:26928220
pmcid:PMC4777086
fatcat:mnq6ojylmngtlfdsc7wfzdbroi
Binocular rivalry from invisible patterns
2016
Proceedings of the National Academy of Sciences of the United States of America
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This work was supported by National Nature Science Foundation of China Grant 31322025, Chinese Academy of Science Grant XDB02050001, and National Institutes of Health Grant R01 EY023101. ...
The test Gabor was presented at two oblique orientations with chromatic contrast adaptively adjusted, interleaved with 5-s top-up adaptations to the invisible gratings. ...
In experiment 2a, the contrast for the visible grating was 3%, tilted +45 or −45 degrees from vertical, and orthogonal to the flickering chromatic gratings in the opposing eye. ...
doi:10.1073/pnas.1604816113
pmid:27354535
pmcid:PMC4968763
fatcat:o3hcb7zcrrhp3nn6bdjp2yu3ka
Choice of Grating Orientation for Evaluation of Peripheral Vision
2016
Optometry and Vision Science
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For both resolution and detection tasks, gratings parallel to the visual field meridian had better threshold compared with the perpendicular gratings, whereas the two oblique gratings had similar thresholds ...
We assessed resolution and detection thresholds for different grating orientations in the peripheral visual field. Methods. ...
(B) The four orientations of gratings used (horizontal, vertical, left oblique, and right oblique). ...
doi:10.1097/opx.0000000000000832
pmid:26889822
pmcid:PMC4883640
fatcat:luvhogukvff3xdgwzdb6wak6uq
Ambiguity in the perception of moving stimuli is resolved in favour of the cardinal axes
2000
Vision Research
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It was only when the contrast of one of the oblique gratings was changed that an oblique axis of motion was perceived. ...
This perceptual anisotropy can be related to naturally occurring bias in the visual environment, notably the predominance of horizontal and vertical contours in our visual world. ...
Medical Research Council and the U.S. ...
doi:10.1016/s0042-6989(00)00188-7
pmid:11115675
fatcat:rnaz43gy4nav7hp3thr4e3hrdm
On the apparent collapse of stereopsis in random-dot-stereograms at isoluminance
1999
Vision Research
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This specific impairment of stereoscopic form (as opposed to depth) processing at isoluminance was confirmed in a further experiment in which subjects were required to judge the presence and orientation ...
On the other hand contrast thresholds for three-dimensional form judgements were much higher than those for depth judgements in isoluminant, compared to isochromatic random-dot-stereograms. ...
Acknowledgements This research was supported by a grant from the MRC (Canada), c MT11554, given to FK, and an NSERC (Canada) PGS B Fellowship to SR. ...
doi:10.1016/s0042-6989(98)00257-0
pmid:10343795
fatcat:emtmkyizxva7hfe6rd6s447y3a
Form and motion processing of second-order stimuli in color vision
2013
Journal of Vision
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Chromatic second-order form perception is very poor across all spatial and temporal frequencies measured and has a lowpass contrast modulation sensitivity function with a spatial cutoff of 1 cycle/8 and ...
We investigate whether there are second-order form and motion mechanisms in human color vision. Second-order stimuli are contrast modulations of a noise carrier. ...
Acknowledgments We wish to thank Iliya Ivanov, Mina Gheiratmand, and Niia Nikolova for their participation as observers and Dr. Yeon Jin Kim for her assistance. ...
doi:10.1167/13.7.10
pmid:23766541
fatcat:ahw44jja5zffdj2tg5uij7fspy
Checkerboards and Color Aftereffects
1977
Science
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sinusoidal rather than square-wave in form). ...
To ask for the Fourier components of a scene is to ask to what degree the scene can be regarded as a linear superposition of periodic patterns of long bars (the component bars, strictly speaking, being ...
of the Fourier components are set to control for the contrast sensitivity limitations of the human visual system, and (iii) the oblique effect is controlled. ...
doi:10.1126/science.198.4313.208
pmid:17755366
fatcat:r2zc3d4g7vcjdal3cuibud5ok4
Page 2693 of Psychological Abstracts Vol. 76, Issue 9
[page]
1989
Psychological Abstracts
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—Accounts for the luminance-dependent variations of chromatic spatial contrast sensitivity functions (SCSFs) by incorporating them into an earlier model by A. M. Rohaly and G. ...
Findings demonstrate the existence of the oblique effect in the hypercyclopean domain comparable in mag- nitude to that present in the luminance domain.
28257. Nachmias, Jacob. ...
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