Study of colour discrimination with comb-filtered spectra.

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：:We examined variation in the visual system both within and among seven species of darters, colorful freshwater fishes of the genus Etheostoma. Using microspectrophotometry, we found that darters possess rod photoreceptor cells, single cone photoreceptor cells containing middle wavelength sensitive (MWS) visual pigment...

journal_title：Vision research

authors： Gumm JM,Loew ER,Mendelson TC

更新日期：2012-02-15 00:00:00

abstract：:This investigation examined the onset response of the transient visually evoked potential elicited by the appearance-disappearance of sine-wave gratings at various levels of spatial frequency, suprathreshold contrast, and stimulus duration. The response was most easily characterized by two negative-positive complexes ...

journal_title：Vision research

authors： Reed JL,Marx MS,May JG

更新日期：1984-01-01 00:00:00

abstract：:The discovery of visual sensitivity to UV dates from 1882 and was made in an insect, the ant, but in the last 15 years evidence for photoreceptors maximally sensitive in the UV has been found for many vertebrates. Studies of behavioral responses of insects that possess more than one spectral class of photoreceptor hav...

journal_title：Vision research

authors： Goldsmith TH

更新日期：1994-06-01 00:00:00

abstract：:Discrimination between a figure and its surround is an important first step of pattern recognition. This discrimination usually relies, as a first step, on the detection of borders between a figure and its surround, for example based on spatial gradients in luminance, colour, or texture. There is evidence that neurone...

journal_title：Vision research

authors： Fahle M,Quenzer T,Braun C,Spang K

更新日期：2003-01-01 00:00:00

abstract：:We present a model for recovering the direction of heading of an observer who is moving relative to a scene that may contain self-moving objects. The model builds upon an algorithm proposed by Rieger and Lawton, based on earlier work by Longuet-Higgins and Prazdny. The algorithm uses velocity differences computed in r...

journal_title：Vision research

authors： Hildreth EC

更新日期：1992-06-01 00:00:00

abstract：:Over the last few years it is becoming increasingly apparent that an important role of the posterior parietal cortex is to process sensory information for the purpose of planning actions. We review studies showing that a large component of neural activity in area LIP is related to planning saccades and activity in a n...

journal_title：Vision research

authors： Snyder LH,Batista AP,Andersen RA

更新日期：2000-01-01 00:00:00

abstract：:The abilities of the human visual system to perform metrical judgements (comparison of lengths, estimation of angles...) involve the existence of some geometrical structure in the visual perceptual space. The question arises whether this geometrical structure is rigidly determined or is subject to adaptive changes. We...

journal_title：Vision research

authors： Droulez J,Cornilleau V

更新日期：1986-01-01 00:00:00

abstract：:Recent work (Shimojo, Silverman & Nakayama, 1989; Vision Research, 29, 619-626) suggests that the visual system must discriminate between extrinsic boundaries (boundaries created by front occluding surfaces) and intrinsic boundaries (real object boundaries) in order to recognize objects and that this would importantly...

journal_title：Vision research

authors： Vallortigara G,Bressan P

更新日期：1991-01-01 00:00:00

abstract：:Previous research has suggested that whereas some techniques show that subjects with a specific reading disability (SRD) have greater visible persistence than controls, a temporal integration of form technique does not. It has been suggested that the failure of the temporal integration task to show a difference result...

journal_title：Vision research

authors： Hogben JH,Rodino IS,Clark CD,Pratt C

更新日期：1995-07-01 00:00:00

abstract：:Humans use smooth pursuit eye movements to track moving objects of interest. In order to track an object accurately, motion signals from the target have to be integrated and segmented from motion signals in the visual context. Most studies on pursuit eye movements used small visual targets against a featureless backgr...

journal_title：Vision research

authors： Debono K,Schütz AC,Spering M,Gegenfurtner KR

更新日期：2010-12-01 00:00:00

abstract：:An observer's ability to discriminate the angular direction of a moving grating depends on the grating orientation. Observers can more accurately judge the angular direction of vertical or horizontal gratings than oblique gratings. We discovered that this oblique effect becomes very large at high spatial frequencies i...

journal_title：Vision research

authors： Coletta NJ,Segu P,Tiana CL

更新日期：1993-12-01 00:00:00

abstract：:Contrast threshold for a sinusoidal target in the simultaneous presence of the vertically displaced peripheral gratings was measured as a function of the peripheral contrast and the separation. When the signal and peripheral gratings were in phase, the low-contrast peripheral gratings produced the improvement in signa...

journal_title：Vision research

authors： Takahashi S,Ejima Y

更新日期：1985-01-01 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：: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：:Some blind humans use sound to navigate by emitting mouth-clicks and listening to the echoes that reflect from silent objects and surfaces in their surroundings. These echoes contain information about the size, shape, location, and material properties of objects. Here we present results from an fMRI experiment that in...

journal_title：Vision research

authors： Milne JL,Arnott SR,Kish D,Goodale MA,Thaler L

更新日期：2015-04-01 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：:Using new geometric information on the shape of the lens that has recently become available, a finite element model has been developed in order to estimate the forces that act on the lens during accommodation for a typical 29-year-old human eye. To investigate the influence of the anterior, posterior and central zonul...

journal_title：Vision research

authors： Hermans EA,Dubbelman M,van der Heijde GL,Heethaar RM

更新日期：2006-10-01 00:00:00

abstract：:The geometry of the cortex and nucleus of excised human lenses was determined by photography and dissection. Samples of the cortex and nucleus were measured spectrophotometrically to allow determination of light loss through the whole lens and the light loss per unit pathlength. It was concluded that the reduction of ...

journal_title：Vision research

authors： Mellerio J

更新日期：1987-01-01 00:00:00

abstract：:Extensive research suggests that the visual system computes the direction of motion of a two-dimensional pattern from the motion of its oriented spatial frequency components. However, there is some evidence to suggest that the local features in a pattern are also important. In order to demonstrate that the local featu...

journal_title：Vision research

authors： Delicato LS,Serrano-Pedraza I,Suero M,Derrington AM

更新日期：2012-06-01 00:00:00

abstract：:A panel of anti-bovine rhodopsin monoclonal antibodies (MAbs) of defined site-specificity has been prepared and used for functional and topographic studies of rhodopsins. In order to select these antibodies, hybridoma supernatants that contained anti-rhodopsin antibodies have been screened by enzyme-linked immunosorbe...

journal_title：Vision research

authors： Adamus G,Zam ZS,Arendt A,Palczewski K,McDowell JH,Hargrave PA

更新日期：1991-01-01 00:00:00

abstract：:Earlier studies using visual double stimuli along the horizontal axis have revealed a strong averaging tendency in the saccadic system. This study shows averaging also for equally eccentric double stimuli with a modest difference in direction (delta phi = 30 deg). When the difference is enlarged (delta phi = 90 deg) t...

journal_title：Vision research

authors： Ottes FP,Van Gisbergen JA,Eggermont JJ

更新日期：1984-01-01 00:00:00

abstract：:The apparent speed of plaids made up of two gratings having the same spatial frequency and the same speed was evaluated (symmetrical type I). The plaids were moving vertically as defined by the intersection-of-constraints (IOC) rule with a mean duration of 300 msec. The comparison-stimulus was a horizontal line moving...

journal_title：Vision research

authors： Castet E,Morgan MJ

更新日期：1996-01-01 00:00:00

abstract：:Thresholds for the detection of rotation and divergence in the presence of a translational component in sparse random dot patterns are determined for human observers and two computer algorithms. The algorithms only make use of local velocity directions and not of local velocity magnitude (speed). The results show that...

journal_title：Vision research

authors： Kappers AM,te Pas SF,Koenderink JJ,van Doorn AJ

更新日期：1996-11-01 00:00:00

abstract：:Thresholds for identifying the direction of second-order motion (contrast-modulated dynamic noise) are consistently higher than those for identifying spatial orientation, unlike first-order gratings for which the two thresholds are typically the same. Two explanations of this phenomenon have been proposed: either firs...

journal_title：Vision research

authors： Ledgeway T,Hutchinson CV

更新日期：2005-07-01 00:00:00

abstract：:The wave-front aberration of the human eye was measured for eight subjects using a spatially resolved refractometer (a psychophysical ray-tracing test). The eyes were undilated and presented with accommodative stimuli varying from 0 to -6 diopters. Monochromatic wave-front aberrations tend to increase with increasing ...

journal_title：Vision research

authors： He JC,Burns SA,Marcos S

更新日期：2000-01-01 00:00:00

abstract：:Most humans seem to demonstrate astonishingly high levels of skill in face processing if one considers the sophisticated level of fine-tuned discrimination that face recognition requires. However, numerous studies now indicate that the ability to process faces is not as fundamental as once thought and that performance...

journal_title：Vision research

authors： Devue C,Barsics C

更新日期：2016-10-01 00:00:00

abstract：:There is a marked anisotropy in the perception of stereoscopic tilt: vertical gradients of horizontal disparity are more easily perceived than horizontal gradients. This could be explained if orientation disparity (the orientation difference in the two eyes' views of the same line) were one of the cues used to determi...

journal_title：Vision research

authors： Mitchison GJ,McKee SP

更新日期：1990-01-01 00:00:00

abstract：:A variable pupil generally regulates the amount of incoming light available for image formation on the retina. However, some of the semi-aquatic snakes (North American Gartersnakes, Thamnophis) that forage in relatively low light conditions reduce the pupil aperture in response to submergence underwater at the expense...

journal_title：Vision research

authors： Fontenot CL Jr

更新日期：2008-07-01 00:00:00

abstract：:Large and small letter contrast sensitivity and visual acuity were assessed in 37 elderly eyes (mean VA -0.01 logMAR, Snellen 6/6) and their lens opacities were categorised and graded using the LOCS III system. Large letter contrast sensitivity was often not reduced in cataract from age-matched normal values and provi...

journal_title：Vision research

authors： Elliott DB,Situ P

更新日期：1998-06-01 00:00:00