Contour interaction in amblyopia: scale selection.

abstract：:Vernier thresholds are known to be elevated when a target pair has opposite contrast polarity. Polarity reversal is used to assess the role of luminance and chromatic pathways in hyperacuity performance. Psychophysical hyperacuity thresholds were measured for pairs of gratings of various combinations of luminance (Lum...

journal_title：Vision research

authors： Sun H,Cooper B,Lee BB

更新日期：2012-03-01 00:00:00

abstract：:Similarity ratings were obtained to determine the minimum number of Gabor components that would produce a comparison texture that appeared preattentively similar to a 64-component standard texture. All textures were chosen to be both specifiable by a relatively small number of localized spectral components and suffici...

journal_title：Vision research

authors： Geri GA,Lyon DR,Zeevi Y

更新日期：1995-02-01 00:00:00

abstract：:How the visual brain integrates temporally dispersed information is an open question. Often, it is assumed that the visual system simply sums light over a certain period of time (e.g. Bloch's law). However, in feature fusion, information presented later dominates, suggesting complex temporal dynamics that cannot be de...

journal_title：Vision research

authors： Scharnowski F,Hermens F,Herzog MH

更新日期：2007-08-01 00:00:00

abstract：:Monocular, steady-state accommodative responses were measured as a function of spatial frequency of simple sinusoidal gratings presented at high contrast and target vergence levels in amblyopes, as well as in strabismics without amblyopia and in visually-normal control subjects. In general, spatial frequency dependenc...

journal_title：Vision research

authors： Ciuffreda KJ,Hokoda SC

更新日期：1983-01-01 00:00:00

abstract：:Three red/green blind observers (dichromats) performed a wavelength discrimination task over a wide range of intensity levels. As expected, discrimination failed in the entire red/green spectral range at the low intensities typically used in wavelength discrimination experiments, but at very high intensities (at or ab...

journal_title：Vision research

authors： McMahon MJ,MacLeod DI

更新日期：1998-04-01 00:00:00

abstract：:We present a two-frequency method to investigate lateral interaction components (liERGs) in the human electroretinogram. Adjacent half cycles of sinusoidal gratings were modulated sinusoidally with different temporal frequencies f1 and f2. The liERGs were defined by the Fourier components at the intermodulation freque...

journal_title：Vision research

authors： Meigen T,Prüfer R,Reime S,Friedrich A

更新日期：2005-10-01 00:00:00

abstract：:Subjects were given reflexive- and voluntary-saccade tasks using five different gap intervals (0-500 ms) between the fixation point offset and the target onset and an overlap paradigm (i.e., the fixation point remained on during the target presentation). In the first experiment, targets were monocularly presented, and...

journal_title：Vision research

authors： Honda H

更新日期：2002-05-01 00:00:00

abstract：:We have found evidence for ultraviolet visual capabilities in a Lake Malawi cichlid fish, Metriaclima zebra. Microspectrophotometry of single cones revealed a visual pigment with peak sensitivity at 368+/-4 nm. M. zebra also expresses a putative ultraviolet opsin gene whose sequence is closely related to the SWS-1 ops...

journal_title：Vision research

authors： Carleton KL,Hárosi FI,Kocher TD

更新日期：2000-01-01 00:00:00

abstract：:To decouple interocular suppression and binocular summation we varied the relative phase of mask and target in a 2IFC contrast-masking paradigm. In Experiment I, dichoptic mask gratings had the same orientation and spatial frequency as the target. For in-phase masking, suppression was strong (a log-log slope of approx...

journal_title：Vision research

authors： Baker DH,Meese TS

更新日期：2007-11-01 00:00:00

abstract：:In this work, optical retardation (OR) was investigated in corneal stroma collagen fibers from nonobese diabetic (NOD) and healthy (BALB/c) mice. Linear dichroism (LD) was investigated in corneas stained with Ponceau SS and Toluidine Blue, using microspectrophotometer. NOD corneas showed higher OR values than the cont...

journal_title：Vision research

authors： Aldrovani M,Guaraldo AM,Vidal BC

更新日期：2007-12-01 00:00:00

abstract：:The purpose of this study was to investigate the effect of dot speed and dot density on the development of global motion perception by comparing the performance of adults and children (5-6years old) on a direction-discrimination task. Motion coherence thresholds were measured at two dot speeds (1 and 4deg/s) and three...

journal_title：Vision research

authors： Narasimhan S,Giaschi D

更新日期：2012-06-01 00:00:00

abstract：:The perceived color of an object depends on the chromaticity of its immediate background. But color appearance is also influenced by remote chromaticities. To quantify these influences, the effects of remote color fields on the appearance of a fixated 2 degrees test field were measured using a forced-choice method. Ch...

journal_title：Vision research

authors： Wachtler T,Albright TD,Sejnowski TJ

更新日期：2001-05-01 00:00:00

abstract：:We set out to determine whether extra-striate ventral stream function was compromised in amblyopia and to compare any observed deficit with previous data on comparable dorsal stream function. We devised a multi-element orientation task where orientation coherence sensitivity could be measured in a comparable way to mo...

journal_title：Vision research

authors： Husk JS,Hess RF

更新日期：2013-04-19 00:00:00

abstract：:Small disparity stimuli applied to large random-dot patterns elicit machine-like vergence eye movements at short latency. We have examined the sensitivity of these eye movements to simulated orthogonal tropias in three normal subjects by recording (1) the effects of vertical disparities on the initial horizontal verge...

journal_title：Vision research

authors： Yang DS,FitzGibbon EJ,Miles FA

更新日期：2003-02-01 00:00:00

abstract：:Linking propositions are statements that relate perceptual states to physiological states, and as such are one of the fundamental building blocks of visual science. A brief history of the concept of linking proposition is presented. Five general families of linking propositions--Identity, Similarity, Mutual Exclusivit...

journal_title：Vision research

authors： Teller DY

更新日期：1984-01-01 00:00:00

abstract：:The present experiment uses a quadrature motion paradigm to investigate the motion correspondence cues used by young infants for coding the direction of motion of red/green isoluminant gratings. Three-month-old infants and adults were tested with 0.25 c/d luminance-modulated or red/green isoluminant gratings, either m...

journal_title：Vision research

authors： Lia B,Dobkins KR,Palmer J,Teller DY

更新日期：1999-05-01 00:00:00

abstract：UNLABELLED:Taurine transporter knockout mice show severe retinal degeneration at an early age. The study was designed to determine whether degeneration also takes place in the absence of light. Mice were maintained up to 6 weeks of age in cyclic lighting or in total darkness. Degeneration took place in both groups, but...

journal_title：Vision research

authors： Rascher K,Servos G,Berthold G,Hartwig HG,Warskulat U,Heller-Stilb B,Häussinger D

更新日期：2004-01-01 00:00:00

abstract：:We investigated the effect of adaptation on orientation discrimination using two experienced observers, then replicated the main effects using a total of 50 naïve subjects. Orientation discrimination around vertical improved after adaptation to either horizontal or vertical gratings, but was impaired by adaptation at ...

journal_title：Vision research

authors： Clifford CW,Wyatt AM,Arnold DH,Smith ST,Wenderoth P

更新日期：2001-01-15 00:00:00

abstract：:Contributions to the multifocal electroretinogram (ERG) from the inner retina (i.e. ganglion and amacrine cells) were identified by recording from monkeys before and after intravitreal injections of n-methyl DL aspartate (NMDLA) and/or tetrodotoxin (TTX). Components similar in waveform to those removed by the drugs we...

journal_title：Vision research

authors： Hood DC,Greenstein V,Frishman L,Holopigian K,Viswanathan S,Seiple W,Ahmed J,Robson JG

更新日期：1999-06-01 00:00:00

abstract：:Existing models for the generation of saccades predict fixed trajectories between start and landing positions of saccades. Experimental data show that saccades have rather variable trajectories. The objective of the present research is to quantify the variability in trajectories of binocular saccades and to test in ho...

journal_title：Vision research

authors： Erkelens AJ,Sloot OB

更新日期：1995-12-01 00:00:00

abstract：:Contours are believed to play a key role in the visual analysis of scenes by the primate brain. In dynamic scenes, the presence of contours is often signaled by discontinuities in motion fields. However, it is unclear whether the motion fields over which the visual system extracts discontinuities, correspond to the lo...

journal_title：Vision research

authors： Sinha P

更新日期：2001-03-01 00:00:00

abstract：:This study examined the manner in which the On and Off systems originating in the retina make their connections with the lateral geniculate nucleus (LGN) of the rhesus monkey. 2-amino-4-phosphonobutyric acid (APB) was either infused or injected into the vitreous chamber of the eye to block the On channel while the res...

journal_title：Vision research

authors： Schiller PH

更新日期：1984-01-01 00:00:00

abstract：:The electroretinogram (ERG) vs perfusion pressure relation was studied in anesthetized rabbits during mechanically induced changes in mean arterial pressure (MAP). After 1 hr of dark adaptation, ERGs were obtained at perfusion pressures from 10 to 95 mmHg with each pressure held for 30-60 sec, and at three levels from...

journal_title：Vision research

authors： Harrison JM,Kiel JW,Smith S

更新日期：1997-09-01 00:00:00

abstract：:Outside the fovea, the visual system pools features of adjacent stimuli. Left or right of fixation the tilt of an almost horizontal Gabor pattern becomes difficult to classify when horizontal Gabors appear above and below it. Classification is even harder when flankers are to the left and right of the target. With all...

journal_title：Vision research

authors： Mareschal I,Morgan MJ,Solomon JA

更新日期：2010-04-07 00:00:00

abstract：:The intention of this series of experiments was to determine the extent to which the pathways sensitive to first-order and second-order motion are independent of one another at, and above, the level of global motion integration. We used translational, radial and rotational motion stimuli containing luminance-modulated...

journal_title：Vision research

authors： Aaen-Stockdale C,Ledgeway T,McGraw P,Hess RF

更新日期：2012-09-01 00:00:00

abstract：:Perceived contrast, contrast detection thresholds and contrast discrimination thresholds were measured in the presence and absence of surrounding patterns of a similar spatio-temporal makeup. In the foveal retina we found that the perceived contrast of the central pattern was reduced by the presence of the contrast su...

journal_title：Vision research

authors： Snowden RJ,Hammett ST

更新日期：1998-06-01 00:00:00

abstract：:Some results from a survey of 43 patients who had a monofocal intra-ocular-lens (IOL) in one eye and a concentric bifocal intra-ocular-lens in the fellow eye are reported. Twenty patients with 6/9 or better post-operative visual acuity in both eyes, participated in the main part of the study. Optical transfer function...

journal_title：Vision research

authors： Charman WN,Murray IJ,Nacer M,O'Donoghue EP

更新日期：1998-09-01 00:00:00

abstract：:The modern study of perception began when Fechner published his 'Elements of Psychophysics' in 1860. This book has guided most perception research ever since. It has become increasingly clear that there are problems with Fechner's approach, which assumes that the percept is completely determined by the sensory input. ...

journal_title：Vision research

authors： Pizlo Z

更新日期：2001-11-01 00:00:00

abstract：:The functional role of three putative neurotransmitter systems in the visual cortex is compared; the GABAergic inhibitory interneurons, the interneurones containing somatostatin and the cholinergic input originating from the nucleus basalis of Meynert (nbM). Evidence is presented to support the role of GABAergic proce...

journal_title：Vision research

authors： Sillito AM,Salt TE,Kemp JA

更新日期：1985-01-01 00:00:00

abstract：:Reentrant processing has been proposed as a critical mechanism in visual perception of an object's features. In order to test whether reentry is critical for visual awareness of object presence, the success of reentry was manipulated with object substitution masking (OSM) while participants performed a forced-choice t...

journal_title：Vision research

authors： Koivisto M

更新日期：2012-06-15 00:00:00