scholarly journals The role of contrast in shape discrimination of radial frequency patterns

2010 ◽  
Vol 10 (15) ◽  
pp. 39-39
Author(s):  
I. V. Ivanov ◽  
K. T. Mullen
Keyword(s):  
Shape Discrimination ◽  
Radial Frequency

scholarly journals Global or local shape discrimination of radial frequency patterns?

2010 ◽  
Vol 3 (9) ◽  
pp. 217-217
Author(s):  
K. T Mullen ◽  
W. H. A. Beaudot
Keyword(s):  
Shape Discrimination ◽  
Local Shape ◽  
Radial Frequency

scholarly journals Kanizsa shape discrimination and contour integration deficits in schizophrenia: What is the role of spatial frequency?

2013 ◽  
Vol 13 (9) ◽  
pp. 721-721
Author(s):  
T. Suhail-Sindhu ◽  
B. P. Keane ◽  
D. Paterno ◽  
G. Erlikhman ◽  
S. Kastner ◽  
...  
Keyword(s):  
Spatial Frequency ◽  
Contour Integration ◽  
Shape Discrimination

scholarly journals The role of symmetry in 3D shape discrimination across changes in viewpoint

2012 ◽  
Vol 12 (9) ◽  
pp. 1048-1048 ◽  
Author(s):  
E. Egan ◽  
J. Todd ◽  
F. Phillips
Keyword(s):  
Shape Discrimination ◽  
3D Shape

The role of nucleus rotundus in figure-ground, color, and shape discrimination

2011 ◽  
Author(s):  
Martin Acerbo ◽  
Olga Lazareva ◽  
Amy Poremba ◽  
Edward Wasserman
Keyword(s):  
Shape Discrimination ◽  
Nucleus Rotundus

scholarly journals Scotopic contour and shape discrimination using radial frequency patterns

2019 ◽  
Vol 19 (2) ◽  
pp. 7 ◽  
Author(s):  
Oliver J. Flynn ◽  
Brett G. Jeffrey
Keyword(s):  
Shape Discrimination ◽  
Radial Frequency

scholarly journals The role of the type of local contour in global shape discrimination.

2013 ◽  
Vol 13 (9) ◽  
pp. 1001-1001
Author(s):  
G. Schmidtmann ◽  
G. J. Kennedy ◽  
H. S. Orbach ◽  
G. Loffler
Keyword(s):  
Shape Discrimination ◽  
Global Shape

Eccentricity Effect of Deformation Detection for Radial Frequency Patterns With Their Centers at Fixation Point

Perception ◽  
2020 ◽  
Vol 49 (8) ◽  
pp. 858-881 ◽  
Author(s):  
Yang Feng ◽  
Qiong Wu ◽  
Jiajia Yang ◽  
Satoshi Takahashi ◽  
Yoshimichi Ejima ◽  
...  
Keyword(s):  
Visual Field ◽  
Stimulus Presentation ◽  
Peripheral Stimulus ◽  
Shape Discrimination ◽  
Eccentricity Effect ◽  
Field Sensitivity ◽  
Radial Frequency ◽  
Circular Contour ◽  
The Mean

We measured the eccentricity effect of deformation thresholds of circular contours for two types of the radial frequency (RF) patterns with their centers at the fixation point: constant circular contour frequency (CCF) RF patterns and constant RF magnified (retino-cortical scaling) RF patterns. We varied the eccentricity by changing the mean radius of the RF patterns while keeping the centers of the RF patterns at the fixation point. Our peripheral stimulus presentation was distinguished from previous studies which have simply translated RF patterns at different locations in the visual field. Sensitivity for such shape discrimination fell off as the moderate and high CCF patterns were presented on more eccentric sites but did not as the low CCF patterns. However, sensitivity held constant as the magnified RF patterns were presented on more eccentric sites, indicating that the eccentricity effects observed for the high and moderate CCF patterns were neutralized by retinocortical mapping. Notably, sensitivity for the magnified RF patterns with large radii (4°–16°) presented in the peripheral field revealed a similar RF dependence observed for RF patterns with small radii (0.25°–1.0°) presented at the fovea in previous studies.

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