نتایج جستجو برای: spatial frequency

تعداد نتایج: 819082  

Journal: :Vision Research 2001
Andrea Li Qasim Zaidi

Li and Zaidi (Li, A., and Zaidi, Q. (2000) Vision Research, 40, 217-242) showed that the veridical perception of the 3-dimensional (3D) shape of a corrugated surface from texture cues is entirely dependent on the visibility of critical patterns of oriented energy. These patterns are created by perspective projection of surface markings oriented along lines of maximum 3D curvature. In images mis...

Journal: :Vision Research 2000
Frederick A.A. Kingdom David R.T. Keeble

Do superimposed textures segregate on the basis of a difference in their luminance spatial frequency? We addressed this question using orientation-gratings, which consist of dense arrays of Gabor micropatterns whose orientations vary sinusoidally across space. Two orientation gratings of the same texture spatial frequency were combined in anti-phase, to produce a 'dual-modulation' orientation g...

Journal: :Journal of the Optical Society of America. A, Optics, image science, and vision 1996
Z L Lu G Sperling

A novel pedestal-plus-test paradigm is used to determine the nonlinear gain-control properties of the first-order (luminance) and the second-order (texture-contrast) motion systems, that is, how these systems' responses to motion stimuli are reduced by pedestals and other masking stimuli. Motion-direction thresholds were measured for test stimuli consisting of drifting luminance and texture-con...

Journal: :Journal of vision 2010
Maximilian Bruchmann Bruno G Breitmeyer Christo Pantev

We measured the strength and optimal target-mask onset asynchrony (SOA(max)) of metacontrast masking using Gabor patches as targets and sinusoidal rings with Gaussian envelopes as masks. We varied spatial frequencies (f) between 0.5 and 8 cpd to manipulate the degree to which spatial frequency channels in the visual system are triggered. By varying spatial frequencies as well as spatial frequen...

Journal: :Brain and cognition 2013
B Fradcourt C Peyrin M Baciu A Campagne

Previous studies performed on visual processing of emotional stimuli have revealed preference for a specific type of visual spatial frequencies (high spatial frequency, HSF; low spatial frequency, LSF) according to task demands. The majority of studies used a face and focused on the appraisal of the emotional state of others. The present behavioral study investigates the relative role of spatia...

Journal: :Vision Research 1999
Stephanie Shorter Christopher Bowd Michael Donnelly Robert Patterson

Across two experiments, this study investigated the spatial frequency tuning and orientation tuning (both in the disparity domain) of the stereoscopic (cyclopean) motion aftereffect. In Experiment 1, observers adapted to a moving stereoscopic grating of a given cyclopean spatial frequency and tested for the motion aftereffect with a static grating of the same or different spatial frequency. Rob...

Journal: :Vision research 1989
M W Greenlee B G Breitmeyer

Simple reaction time to the onset of sinewave gratings was measured as a function of spatial frequency in two observers. These results are compared to the choice reaction time required for the observer to correctly discriminate the spatial frequency of two gratings flashed sequentially. Grating contrast was either 0.75 or 1.5 logarithmic units above the detection threshold for each spatial freq...

Journal: :Sheng li xue bao : [Acta physiologica Sinica] 2000
H B Yu T D Shou

Using optical imaging based on intrinsic signals, we studied spatial frequency tuning characteristics of cat primary visual cortex at different visual topological locations. We found that the areas representing the peripheral visual field had null or very weak responses to high spatial frequency grating stimuli, whereas the areas representing the central visual field responded to the stimuli of...

Journal: :Vision Research 2005
Casimir J.H. Ludwig Iain D. Gilchrist Eugene McSorley

We explored the dependency of the saccadic remote distractor effect (RDE) on the spatial frequency content of target and distractor Gabor patches. A robust RDE was obtained with low-medium spatial frequency distractors, regardless of the spatial frequency of the target. High spatial frequency distractors interfered to a similar extent when the target was of the same spatial frequency. We develo...

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