Symmetry discrimination in patients with retinitis pigmentosa.

abstract：:In this study, we show that glutamate regulates the viability of cultured retinal cells upon transient glucose deprivation. At low concentrations (10-100 microM) glutamate decreased MTT [3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide] reduction to about 50% of control and decreased intracellular ATP leve...

journal_title：Vision research

authors： Rego AC,Santos MS,Areias F,Proença T,Oliveira CR

更新日期：2001-03-01 00:00:00

abstract：:The integration of spatially distinct elements into coherent objects is a fundamental process of vision. Yet notwithstanding an extensive literature on perceptual grouping, we still lack a clear understanding of the representational consequences of grouping disparate visual locations. We investigated this question in ...

journal_title：Vision research

authors： Harrison SJ,Feldman J

更新日期：2009-11-01 00:00:00

abstract：:A coordinated movement of the eyes and head in the head-unrestrained condition is often used to change orientation between targets. Under natural conditions, these gaze shifts are typically generated with the eyes roughly centered in the orbits. To achieve experimental control of eye and head positions, a miniature la...

journal_title：Vision research

authors： Gandhi NJ,Sparks DL

更新日期：2001-01-01 00:00:00

abstract：:The attentional mechanisms in the brain responsible for fast pop-out search and slower difficult search have been shown to interact. Even if pop-out search is interrupted, by the addition of extra distractors to an initially simple search display, the partial computations calculated by the mechanisms responsible for p...

journal_title：Vision research

authors： Olds ES,Punambolam RJ

更新日期：2002-03-01 00:00:00

abstract：:Field spectral sensitivities of the pattern-elicited electroretinogram (PERG) were obtained from two subjects using a modified version of Stiles' two-color increment threshold procedure. A 540 nm checkerboard test pattern of 38 degrees dia was alternated at 8 Hz on a uniform adapting field of the same size. Test inten...

journal_title：Vision research

authors： Wu S

更新日期：1992-11-01 00:00:00

abstract：:Light and darkness promote opposite migrations of screening pigment granules in the retinal photoreceptors of the crayfish and other arthropods, and microtubules have been implicated in this part of the adaptation process. This report considers the topographic relationships of the migratory pigment granules with the m...

journal_title：Vision research

authors： Frixione E,Tsutsumi V

更新日期：1982-01-01 00:00:00

abstract：:The NMDA subtype of glutamate receptor and its co-agonist d-serine play a key role in synaptic function in the central nervous system (CNS), including visual cortex and retina. In retinal diseases such as glaucoma and macular degeneration, a loss of vision arises from malfunction of retinal cells, resulting in a gluta...

journal_title：Vision research

authors： Staubli U,Rangel-Diaz N,Alcantara M,Li YX,Yang JY,Zhang KM,Foster AC

更新日期：2016-10-01 00:00:00

abstract：:To pursue a small target moving in front of a drifting background, motion vectors from the target need to be integrated and segmented from those belonging to the background. Smooth pursuit eye movements typically integrate target and background directions initially and after some time shift towards the veridical targe...

journal_title：Vision research

authors： Debono K,Schütz AC,Gegenfurtner KR

更新日期：2012-03-15 00:00:00

abstract：:Reduced perceptual span is one factor which limits reading speed in patients with macular disease. This study measured the perceptual span and the number of saccades to locate a target in 18 patients with macular disease and seven control subjects on two occasions separated by up to 12 months. Perceptual span changed ...

journal_title：Vision research

authors： Crossland MD,Rubin GS

更新日期：2006-02-01 00:00:00

abstract：:Adaptation is a fundamental property of perceptual processing. In low-level vision, it can calibrate perception to current inputs, increasing coding efficiency and enhancing discrimination around the adapted level. Adaptation also occurs in high-level vision, as illustrated by face aftereffects. However, the functiona...

journal_title：Vision research

authors： Rhodes G,Watson TL,Jeffery L,Clifford CW

更新日期：2010-05-12 00:00:00

abstract：:Bees are predominantly diurnal; only a few groups fly at night. An evolutionary limitation that bees must overcome to inhabit dim environments is their eye type: bees possess apposition compound eyes, which are poorly suited to vision in dim light. Here, we theoretically examine how nocturnal bees Megalopta genalis fl...

journal_title：Vision research

authors： Theobald JC,Greiner B,Wcislo WT,Warrant EJ

更新日期：2006-07-01 00:00:00

abstract：:Explorative eye movements specifically target some parts of a scene while ignoring others. Here, we investigate how local image structure--defined by spatial frequency contrast--and informative image content--defined by higher order image statistics-are weighted for the selection of fixation points. We measured eye mo...

journal_title：Vision research

authors： Kayser C,Nielsen KJ,Logothetis NK

更新日期：2006-08-01 00:00:00

abstract：:We compared the thresholds and response properties of extracellularly recorded retinal ganglion cells (RGCs) in wild-type and rd1 mouse retinas to electrical stimulation of the retinal neural network. Retinas were stimulated in vitro with biphasic current pulses (1 ms/phase) applied with a 400-microm diameter, subreti...

journal_title：Vision research

authors： Jensen RJ,Rizzo JF 3rd

更新日期：2008-06-01 00:00:00

abstract：:At temporal frequencies between approximately 30 and 70 Hz, the flicker electroretinogram (ERG) of the cone system can exhibit an alternation in response amplitude from cycle to cycle that has been termed synchronous period doubling. This phenomenon has been attributed to a nonlinear feedback mechanism at an early ret...

journal_title：Vision research

authors： Alexander KR,Raghuram A

更新日期：2007-02-01 00:00:00

abstract：:The response latency of horizontal cells in the carp retina was investigated by means of the stimulus-response crosscorrelation using a randomly modulated light of various wavelengths. R/G type cells produced two response components with some difference in latency; short-latency hyperpolarising response to green light...

journal_title：Vision research

authors： Yamada M,Shigematsu Y,Fuwa M

更新日期：1985-01-01 00:00:00

abstract：:We sought to determine whether the cross-correlation between signals and masks consisting of Gaussian modulated grating patterns is consistent with observed psychophysical masking effects. Our experimental results support this relationship, and suggest further specifications for the determinants of pattern masking eff...

journal_title：Vision research

authors： Caelli T,Moraglia G

更新日期：1987-01-01 00:00:00

abstract：:The gaze of another modulates and shifts an observer's spatial attention toward this gaze direction. This phenomenon is termed joint attention. Although previous studies found joint attention was induced during a spatial working memory task, it remains an open question whether spatial working memory interferes with jo...

journal_title：Vision research

authors： Yokoyama T,Kato R,Inoue K,Takeda Y

更新日期：2019-01-01 00:00:00

abstract：:Prior research has suggested that two types of fast eye movements (FEMs) can be distinguished behaviorally. Foveating saccades respond to salient peripheral targets by directing the target image to the fovea. Non-foveating saccades include other FEMs such as nystagmus quick phase, saccades without visual stimuli and v...

journal_title：Vision research

authors： Whittaker SG,Cummings RW,Swieson LR

更新日期：1991-01-01 00:00:00

abstract：:Two mechanisms, one for the detection of fast, and the other for slow movement of a sinusoidal grating are identified, and investigated under central, parafoveal, and peripheral viewing conditions. The fast movement data is considered in terms of the Reichardt model, in which signals from two adjacent inputs are cross...

journal_title：Vision research

authors： Murray I,MacCana F,Kulikowski JJ

更新日期：1983-01-01 00:00:00

abstract：:Thresholds for detecting brief, white, foveal test flashes drop abruptly within 0.2 sec of the offset of a white adapting field. The magnitude of the abrupt drop is proportional to the square root of field intensity (square root of I) correct for bleaching and dark light. Thresholds are then stable out to 1.6 sec for ...

journal_title：Vision research

authors： Reeves A,Wu S,Schirillo J

更新日期：1998-03-01 00:00:00

abstract：:We have investigated first-order artifacts in second-order motion perception. Subjects were required to identify the orientation and direction of a drifting sinusoidal contrast modulation. When the carrier consisted of static two-dimensional noise, performance often reflected the use of first-order artifacts that aris...

journal_title：Vision research

authors： Smith AT,Ledgeway T

更新日期：1997-01-01 00:00:00

abstract：:This study compared frequency-of-seeing curves for a line displacement test in glaucoma patients and normals. Probit analysis of the frequency-of-seeing curves provided the motion thresholds and the slopes of the frequency-of-seeing curves, represented by the interquartile range. The thresholds and interquartile range...

journal_title：Vision research

authors： Westcott MC,Fitzke FW,Crabb DP,Hitchings RA

更新日期：1999-02-01 00:00:00

abstract：:Amblyopic subjects were asked to memorize circles of different radii (2, 4 and 6 degrees), and then to reconstruct them monocularly with each eye, point by point (12 points per circle). The resulting two-dimensional maps of visual space showed considerable distortions, including expansion, shrinkage and torsion of spe...

journal_title：Vision research

authors： Sireteanu R,Lagreze WD,Constantinescu DH

更新日期：1993-03-01 00:00:00

abstract：:In an attempt to uncover the properties of the psychophysical spatial mechanisms which optimally respond to the vernier offset between two abutting lines, we investigated the effects of one-dimensional band-limited spatial noise masks superimposed with the target, on vernier thresholds. Unidirectional vernier threshol...

journal_title：Vision research

authors： Waugh SJ,Levi DM,Carney T

更新日期：1993-08-01 00:00:00

abstract：:The effects of fourth nerve palsy on the vestibulo-ocular reflex (VOR) had not been systematically investigated. We used the magnetic scleral search coil technique to study the VOR in patients with unilateral fourth nerve palsy during sinusoidal head rotations in yaw, pitch and roll at different frequencies. In darkne...

journal_title：Vision research

authors： Wong AM,Sharpe JA,Tweed D

更新日期：2002-08-01 00:00:00

abstract：:A dysfunction of dopaminergic retinal neurons is thought to occur in Parkinson's disease, manifesting itself in impaired performance on various visual discrimination tasks. We have investigated whether differences in colour discrimination could readily be detected between a normal group and a Parkinsonian group, using...

journal_title：Vision research

authors： Regan BC,Freudenthaler N,Kolle R,Mollon JD,Paulus W

更新日期：1998-11-01 00:00:00

abstract：:The orientation of the median plane of the eye with respect to the head varies with gaze direction according to Listing's Law. The subjective vertical (SV), however, is known to be only partially affected by these involuntary variations of eye orientation. In order to learn more about the compensatory process underlyi...

journal_title：Vision research

authors： Haustein W,Mittelstaedt H

更新日期：1990-01-01 00:00:00

abstract：:A pincushion formed by four arcs on a gray background looks darker when the arcs are black, and lighter when the arcs are white. Yet, a matching-experiment shows that this difference is relative. Whereas the apparently darker pincushion requires a matching luminance that is lower than the background luminance (i.e. as...

journal_title：Vision research

authors： De Weert CM,Spillmann L

更新日期：1995-05-01 00:00:00

abstract：:A new discrete-time reverse-correlation scheme for the study of visual neurons is proposed. The visual stimulus is generated by drawing with uniform probability, at each refresh time, an image from a finite set S of orthonormal images. We show that if the neuron can be modeled as a spatiotemporal linear filter followe...

journal_title：Vision research

authors： Ringach DL,Sapiro G,Shapley R

更新日期：1997-09-01 00:00:00

abstract：:Match stimuli presented on one side of a contextual image were adjusted to have the same appearance as test stimuli presented on the other side. Both full color and isochromatic contextual images were used. Contextual image pairs were constructed that had identical S-cone image planes, while their L- and M-cone image ...

journal_title：Vision research

authors： Delahunt PB,Brainard DH

更新日期：2000-01-01 00:00:00