Performance of photovoltaic arrays in-vivo and characteristics of prosthetic vision in animals with retinal degeneration.

abstract：:For being a polarized neuron and having a sensory cilium, photoreceptors attract remarkable attention. This is due their highly polarized structure and active visual signal transduction cascades and for the enrichment of complex networks of proteins in the cilium. Structural and functional maintenance of the photorece...

journal_title：Vision research

authors： Yildiz O,Khanna H

更新日期：2012-12-15 00:00:00

abstract：:The minimum stimulus necessary to define motion is a change in position from one location to another in time, but past studies have provided evidence that the human motion system integrates motion over more than two positions. In this study we demonstrate strong sequential interactions affecting perceived direction in...

journal_title：Vision research

authors： Welch L,Macleod DI,Mckee SP

更新日期：1997-10-01 00:00:00

abstract：:We evaluated the relative orientations of the displacement planes of the two eyes under various conditions: fixations of nearby targets, of far targets and targets presented dichoptically at optical infinity. We show that disparity driven vergence is not always required to rotate the primary positions. We find that ey...

journal_title：Vision research

authors： Bruno P,van den Berg AV

更新日期：1997-04-01 00:00:00

abstract：:Human observers can extract a given motion direction from sets of random dots moving simultaneously in two or more directions in the same region of the visual field, a phenomenon referred to as motion transparency. As a necessary condition for separating transparent motion directions, low level encoding of local motio...

journal_title：Vision research

authors： Felisberti FM,Zanker JM

更新日期：2005-09-01 00:00:00

abstract：:A technique of multi-input systems analysis is used to explore the field topography of ERG responses to local luminance modulation. Variations in amplitude and wave form are studied within the central 23 degrees. Outside the fovea, the amplitude appears to follow a simple power law rx as a function of eccentricity r w...

journal_title：Vision research

authors： Sutter EE,Tran D

更新日期：1992-03-01 00:00:00

abstract：:Electrophysiological recording and microspectrophotometry were used to analyze retinal function in representatives of the two surviving genera of holostean grade fish--the bowfin (Amia calva) and gars (Lepisosteus sp.). The properties of the cone photopigments, horizontal cells and ganglion cells show that these holos...

journal_title：Vision research

authors： Burkhardt DA,Gottesman J,Levine JS,MacNichol EF Jr

更新日期：1983-01-01 00:00:00

abstract：:While identified regions of human extrastriate visual cortex are functionally specialized for processing different attributes of an object, the cognitive and neural mechanisms by which these attributes are dynamically bound into integrated percepts are still largely mysterious. Here, we report that perceptual organiza...

journal_title：Vision research

authors： Clifford CW,Spehar B,Pearson J

更新日期：2004-12-01 00:00:00

abstract：:With strict fixation, a small uniform target of medium contrast, placed at 10 deg eccentricity, faded much faster when presented on a dynamic random noise background than on either a static random noise background or a uniform background of the same luminance. Time to first disappearance was between 10 and 16 sec when...

journal_title：Vision research

authors： Spillmann L,Kurtenbach A

更新日期：1992-10-01 00:00:00

abstract：:We have investigated the contribution of ocular muscle proprioception (OMP) to the long-term maintenance of ocular alignment in normal human beings. Using a scleral suction lens, one eye was rotated laterally 30 deg away from the position of the other eye. This procedure selectively affects OMP without altering the ef...

journal_title：Vision research

authors： Gauthier GM,Vercher JL,Zee DS

更新日期：1994-10-01 00:00:00

abstract：:This study investigated whether low-level attentional processes as indicated by saccade trajectories are modulated by higher-order factors as indicated by participants' cultural background. We hypothesized that if the East Asian participants engage in context-dependent attentional processing to a greater extent than t...

journal_title：Vision research

authors： Petrova K,Wentura D,Fu X

更新日期：2013-05-24 00:00:00

abstract：:We examined the ability of human observers to detect three kinds of statistical structure in binary arrays: first-order statistics (luminance), local fourth-order statistics (isodipole textures), and long-range statistics (bilateral symmetry). Performance was closest to ideal on the luminance task and furthest from id...

journal_title：Vision research

authors： Victor JD,Conte MM

更新日期：2005-04-01 00:00:00

abstract：:Six observers were asked to indicate in which of two opposite directions, to the right or to the left, an entire display appeared to move, based on the proportion of right vs leftward motion elements, each of which was distinctly visible. The performance of each observer was described by Thurstone's discriminative pro...

journal_title：Vision research

authors： Raidvee A,Averin K,Kreegipuu K,Allik J

更新日期：2011-09-01 00:00:00

abstract：:We argue against recent claims by Erkelens and van Ee (Vision Res., in press) and by Erkelens (Vision Res. 40 (2000) 2411) that "the concept of the cyclopean eye is em leader always irrelevant as far as vision is concerned" (p. 1157) [corrected] and that "perceived direction during monocular viewing is based on the si...

journal_title：Vision research

authors： Ono H,Mapp AP,Howard IP

更新日期：2002-05-01 00:00:00

abstract：:We have studied the effects of depolarization in the living human eye by using a spatially resolved Mueller-matrix polarimeter [Opt. Lett. 24 (1999) 64]. Results show that the degree of polarization for the central part of double-pass images is about 0.85 and 0.70 for 2 mm and 5 mm of pupil, respectively. This paramet...

journal_title：Vision research

authors： Bueno JM

更新日期：2001-09-01 00:00:00

abstract：:Horizontal pursuit eye movements were investigated in two separate groups of children: One group exhibited developmental co-ordination disorder (n = 8) whilst another group of children were born prematurely (n = 8). Both studies found a reduced gain in pursuit eye movements when the respective populations were compare...

journal_title：Vision research

authors： Langaas T,Mon-Williams M,Wann JP,Pascal E,Thompson C

更新日期：1998-06-01 00:00:00

abstract：:This paper describes evidence for spatial aliasing in human motion perception. For a certain range of spatial frequencies, interference fringes drifting across the extrafoveal retina resemble two-dimensional spatial noise drifting in the opposite direction. For retinal locations within 10 deg of the fovea, the perceiv...

journal_title：Vision research

authors： Coletta NJ,Williams DR,Tiana CL

更新日期：1990-01-01 00:00:00

abstract：:Lenses from 27 human eyes ranging in age from 10 to 87 years were used to determine how accommodation and age affect the optical properties of the lens. A scanning laser technique was used to measure focal length and spherical aberration of the lenses, while the lenses were subjected to stretching forces applied throu...

journal_title：Vision research

authors： Glasser A,Campbell MC

更新日期：1998-01-01 00:00:00

abstract：:With the identification and structural characterization of several visual pigments has come a new era of investigation. The above comparisons of amino acids sequences predict specific functional domains that may be tested to tell us how visual pigments function to absorb light and transform this "signal" to trigger a ...

journal_title：Vision research

authors： Applebury ML,Hargrave PA

更新日期：1986-01-01 00:00:00

abstract：:A counterphase-modulated (i.e. contrast reversing) pattern will affect hypothetical neural elements sensitive to motion as well as hypothetical elements sensitive to changes in contrast and other elements sensitive to local luminance. Attempts to describe visual evoked potentials (VEPs) to contrast reversal entirely i...

journal_title：Vision research

authors： Spekreijse H,Dagnelie G,Maier J,Regan D

更新日期：1985-01-01 00:00:00

abstract：:The effects of monocular deprivation (MD) on the crossed and uncrossed visual projections were studied using both electrophysiological and behavioural criteria. Our results show that Visual Evoked Potentials (VEPs) from the deprived eye (DE) in response to contrast reversing gratings are more reduced in the ipsilatera...

journal_title：Vision research

authors： Bisti S,Carmignoto G

更新日期：1986-01-01 00:00:00

abstract：:A chemical mutagenesis to identify zebrafish eye morphological mutants was performed by screening F(3) larvae at 5 and 7 days post-fertilization (dpf) for changes in eye or pupil size. Based on histological analysis, four different phenotypic classes were obtained. The two Class I and three Class II mutants are all ch...

journal_title：Vision research

authors： Vihtelic TS,Hyde DR

更新日期：2002-02-01 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：: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：:Eye position was recorded in different viewing conditions to assess whether the temporal and spatial characteristics of saccadic eye movements in different individuals are idiosyncratic. Our aim was to determine the degree to which oculomotor control is based on endogenous factors. A total of 15 naive subjects viewed ...

journal_title：Vision research

authors： Andrews TJ,Coppola DM

更新日期：1999-08-01 00:00:00

abstract：:Saleh and Bonnet [Fechner Day 98, p. 344] have shown that, upon parafoveal stimulation and up to 6.5 c/deg, reaction time (RT) is a function of grating contrast multiplied by grating period. The present experiments extend these findings to foveal stimulation within a wider spatial-frequency (SF) range and to stimuli o...

journal_title：Vision research

authors： Vassilev A,Mihaylova M,Bonnet C

更新日期：2002-03-01 00:00:00

abstract：:While saccadic eye movements produce rapid shift of images of objects on the retina, the visual world is perceived as stationary (visual stability), but the precise mechanisms involved in such perception remain unclear. We investigated if visual stimuli existing before and/or after a saccade serve to preserve visual s...

journal_title：Vision research

authors： Honda H

更新日期：2006-10-01 00:00:00

abstract：:Non-Fourier motion is now commonplace in research on visual motion perception, yet lacks a computational framework. This paper examines this issue based on the observation that many non-Fourier motion stimuli have a simple characterization in the frequency domain, in terms of oriented power distributions that lie alon...

journal_title：Vision research

authors： Fleet DJ,Langley K

更新日期：1994-11-01 00:00:00

abstract：:Glutamate is the major excitatory neurotransmitter in the vertebrate retina. Native glutamate transporters have been well characterized in several retinal neurons, particularly from the salamander retina. We have cloned five distinct glutamate transporters from the salamander retina and examined their localization and...

journal_title：Vision research

authors： Eliasof S,Arriza JL,Leighton BH,Amara SG,Kavanaugh MP

更新日期：1998-05-01 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：: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