scholarly journals On the contribution of second-order boundary contour strength to binocular rivalry

2010 ◽  
Vol 6 (6) ◽  
pp. 851-851 ◽  
Author(s):  
J. Xu ◽  
Z. J. He ◽  
T. L. Ooi
Keyword(s):  
Binocular Rivalry ◽  
Second Order ◽  
Boundary Contour ◽  
Contour Strength

Binocular Rivalry and Surface-Boundary Processing

Perception ◽  
10.1068/p5489 ◽  
2006 ◽  
Vol 35 (5) ◽  
pp. 581-603 ◽  
Author(s):  
Teng Leng Ooi ◽  
Zijiang J He
Keyword(s):  
Visual System ◽  
Binocular Rivalry ◽  
Empirical Studies ◽  
Surface Boundary ◽  
Boundary Contour ◽  
Similar Stimulus ◽  
Perceptual Salience ◽  
Matching Process ◽  
Contour Information ◽  
Stimulus Design

Theoretical and empirical studies show that the visual system relies on boundary contours and surface features (eg textures) to represent 3-D surfaces. When the surface to be represented has little texture information, or has a periodic texture pattern (grating), the boundary contour information assumes a larger weight in representing the surface. Adopting the premise that the mechanisms of 3-D surface representation also determine binocular rivalry perception, the current paper focuses on whether boundary contours have a similar role in binocular rivalry. In experiment 1, we tested the prediction that the visual system prefers selecting an image/figure defined by boundary contours for rivalry dominance. We designed a binocular rivalry stimulus wherein one half-image has a boundary contour defined by a grating disk on a background with an orthogonal grating orientation. The other half-image consists solely of the (same orientation) grating background without the grating disk, ie no boundary contour. Confirming our prediction, the predominance for the half-image with the grating disk is ∼90%, despite the fact that the grating disk corresponds to an area with orthogonal grating in the fellow eye. The advantage of the grating disk is dramatically reduced to about 50% predominance when a boundary contour is added to the background-only half-image at the location corresponding to the grating disk. We attribute this reduced advantage to the formation of a corresponding binocular boundary contour. In experiment 2 the grating background was substituted by a random-dot background in a similar stimulus design. We found that the perceptual salience of the corresponding binocular boundary contours extracted by the interocular matching process is an important factor in determining the dynamics of binocular rivalry. Experiment 3 showed that vertical lines with uneven thickness and spacing as the background reduce the contribution of the monocular boundary contour of the grating disk in binocular rivalry, possibly through the formation of binocular boundary contours between the local edges (vertical components) of the vertical lines and the corresponding grating disk.

scholarly journals Differentiating the contributions of surface feature and boundary contour strengths in binocular rivalry

2010 ◽  
Vol 10 (7) ◽  
pp. 335-335
Author(s):  
X. Li ◽  
Y. G. Su ◽  
T. L. Ooi ◽  
Z. J. He
Keyword(s):  
Binocular Rivalry ◽  
Surface Feature ◽  
Boundary Contour

scholarly journals On boundary contour and center-surround factors in binocular rivalry

2010 ◽  
Vol 9 (8) ◽  
pp. 306-306
Author(s):  
T. L. Ooi ◽  
Y. Su ◽  
J. Xu ◽  
Z. He
Keyword(s):  
Binocular Rivalry ◽  
Boundary Contour

Disappearance Voltage Determinations Using a Convergent Beam

1971 ◽  
Vol 29 ◽  
pp. 184-185
Author(s):  
W. L. Bell
Keyword(s):  
Second Order ◽  
Objective Method ◽  
Uniform Thickness ◽  
Rocking Curve ◽  
Crystal Perfection ◽  
Kikuchi Line ◽  
Central Maximum ◽  
Diffraction Patterns ◽  
Convergent Beam ◽  
Beam Technique

Disappearance voltages for second order reflections can be determined experimentally in a variety of ways. The more subjective methods, such as Kikuchi line disappearance and bend contour imaging, involve comparing a series of diffraction patterns or micrographs taken at intervals throughout the disappearance range and selecting that voltage which gives the strongest disappearance effect. The estimated accuracies of these methods are both to within 10 kV, or about 2-4%, of the true disappearance voltage, which is quite sufficient for using these voltages in further calculations. However, it is the necessity of determining this information by comparisons of exposed plates rather than while operating the microscope that detracts from the immediate usefulness of these methods if there is reason to perform experiments at an unknown disappearance voltage.The convergent beam technique for determining the disappearance voltage has been found to be a highly objective method when it is applicable, i.e. when reasonable crystal perfection exists and an area of uniform thickness can be found. The criterion for determining this voltage is that the central maximum disappear from the rocking curve for the second order spot.

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