Reduced perceptual dimensionality in extrafoveal vision.

abstract：:Contrast modulation affords independent control of static contrast (C) and changes in contrast (delta C). We found that in anesthetized, paralyzed cats, the visual evoked potential (VEP) was dependent only on magnitude of delta C at each pattern transition, and was independent of the starting or ending contrast level....

journal_title：Vision research

authors： Pang XD,Bonds AB

更新日期：1991-01-01 00:00:00

abstract：:We study the "color weight" for a number of rather different paradigms. In well researched heterochromatic photometry methods we find that the "weights" determined by settings of naive observers are closely determined by the CIE luminance functional. This is very different for tasks that involve mid- and high-level as...

journal_title：Vision research

authors： Koenderink J,van Doorn A,Gegenfurtner K

更新日期：2018-10-01 00:00:00

abstract：:Random-dot cinematograms comprising many different, spatially intermingled local motion vectors can produce a percept of global coherent motion in a single direction. Thresholds for discriminating the direction of global motion were measured under various conditions. Discrimination thresholds increased with the width ...

journal_title：Vision research

authors： Watamaniuk SN,Sekuler R

更新日期：1992-12-01 00:00:00

abstract：:A masking paradigm was employed to measure the spatial frequency selectivity of channels underlying human stereopsis. Observers viewed spatially filtered (0.4 octave bandwidth) random-dot stereograms in which a disparate bar appeared in either the top or bottom half of the display; superimposed on one RDS half-image w...

journal_title：Vision research

authors： Yang Y,Blake R

更新日期：1991-01-01 00:00:00

abstract：:How is a single visual direction assigned to a binocular feature for which the left and right eyes are signaling different directions? According to geometrical principles, binocular visual direction is the average of the visual directions measured from the left and right eyes. Contrary to this prediction, we have foun...

journal_title：Vision research

authors： Mansfield JS,Legge GE

更新日期：1996-01-01 00:00:00

abstract：:Reaction times (RTs) are obtained for a wide range of contrasts of vertical sinusoidal gratings. The data are plotted as a function of the reciprocal of contrast. In some conditions, a single linear function accounts for the data. In others a clear bi-linear function is obtained. The low and high contrast regions of t...

journal_title：Vision research

authors： Murray IJ,Plainis S

更新日期：2003-11-01 00:00:00

abstract：:A change in the basic-level class when viewing a sequence of two objects produces a large release from adaptation in LOC compared to when the images are identical. Is this due to a change in semantics or shape? In an fMRI-adaptation experiment, subjects viewed a sequence of two objects and judged whether the stimuli w...

journal_title：Vision research

authors： Kim JG,Biederman I,Lescroart MD,Hayworth KJ

更新日期：2009-09-01 00:00:00

abstract：:Response properties of neurons in V3A were studied at a retinal eccentricity of 2-4 deg. The distributions of spatial frequency bandwidths and orientation bandwidths were similar to those of neurons in V1. Peaks of spatial frequency tuning curves ranged from 0.35 to 8.0 c/deg with a mean of 1.75 c/deg. Most V3A cells ...

journal_title：Vision research

authors： Gaska JP,Jacobson LD,Pollen DA

更新日期：1988-01-01 00:00:00

abstract：:The perceived blur of drifting sinusoidal gratings was compared to that of static, blurred "square wave" gratings before and after adaptation to a missing fundamental (MF) pattern. The results indicate that the perceived blur of a drifting sine grating is inversely related to its drift speed. However, after adaptation...

journal_title：Vision research

authors： Hammett ST,Bex PJ

更新日期：1996-09-01 00:00:00

abstract：:The spatial vision of two adult galagos (Galago crassicaudatus) was assessed using a two choice discrimination task to determine their contrast sensitivity. Both contrast sensitivity functions exhibited low and high spatial frequency attenuation with the peak sensitivity at 1%. For one animal, the peak occurred at 0.5...

journal_title：Vision research

authors： Langston A,Casagrande VA,Fox R

更新日期：1986-01-01 00:00:00

abstract：:Extra-retinal information about eye velocity is thought to play an important role in compensating the retinal motion experienced during an eye movement. Evidently this compensation process is prone to error, since stimulus properties such as contrast and spatial frequency have marked effect on perceived motion with re...

journal_title：Vision research

authors： Sumnall JH,Freeman TC,Snowden RJ

更新日期：2003-07-01 00:00:00

abstract：:If a brief test pulse is presented on a prolonged background pedestal, it is strongly masked if presented at the start of the pedestal, and is only weakly masked if presented 200 ms after the start. This has been suggested to occur due to contrast gain mechanisms that reduce the representation of the pedestal and ther...

journal_title：Vision research

authors： Snowden RJ

更新日期：2001-07-01 00:00:00

abstract：:Rapid texture segregation is examined using filtered noise textures. The stimuli consist of a foreground region of filtered noise with one dominant texture orientation against a background region with a different dominant orientation. Shape discrimination of the foreground region is measured as a function of the diffe...

journal_title：Vision research

authors： Landy MS,Bergen JR

更新日期：1991-01-01 00:00:00

abstract：:We investigated temporal summation of the rods in a complete achromat, who lacks cone vision. Critical duration (tc) was estimated both at the achromat's preferred area of fixation and at an area 12 deg laterally in the nasal visual field. Comparable tc determinations were made in a normal trichromat. At background lu...

journal_title：Vision research

authors： Sharpe LT,Fach C,Nordby K

更新日期：1988-01-01 00:00:00

abstract：:The sustained component of visual attention lowers the perceptual threshold of stimuli located at the attended region. Attentional performance is not equal for all eccentric positions, leading to variations in perception. The location of the preferred retinal locus (PRL) for fixation might be influenced by these atten...

journal_title：Vision research

authors： Barraza-Bernal MJ,Ivanov IV,Nill S,Rifai K,Trauzettel-Klosinski S,Wahl S

更新日期：2017-11-01 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：:Moving stimuli cause the position of flashed stimuli to appear shifted in the direction of motion (position capture). To examine whether position capture depends on low-level motion interactions or perception of integrated object motion, we employed a slit-view display. Two line-drawn diamonds translated horizontally ...

journal_title：Vision research

authors： Watanabe K,Nijhawan R,Shimojo S

更新日期：2002-11-01 00:00:00

abstract：:It is now clear, contrary to previous conclusions, that motion may be conveyed by purely chromatic stimuli. The question considered here is how the mechanisms for assessing motion of luminance and chromatic stimuli differ. The dependence on contrast of amplitude thresholds for the perception of oscillatory motion was ...

journal_title：Vision research

authors： Krauskopf J,Li X

更新日期：1999-10-01 00:00:00

abstract：:In contrast to the classical findings of lightness constancy, recent psychophysical studies show the strong dependency of the perceived reflectance of a surface on the structure of the natural illumination. The present study examined this inconstancy for systematic variations in the light field and an image-based expl...

journal_title：Vision research

authors： Motoyoshi I,Matoba H

更新日期：2012-01-15 00:00:00

abstract：:Binocular sensory fusion which was previously thought to have a maximum spatial extent at the fovea of 1 deg is at least 600% larger when stimulated by low spatial frequency (coarse) detail. This upper limit for sensory fusion has a constant phase disparity limit of 90 deg which corresponds to the monocular Rayleigh c...

journal_title：Vision research

authors： Schor C,Wood I,Ogawa J

更新日期：1984-01-01 00:00:00

abstract：:According to the Oppel-Kundt illusion, a filled space appears larger than an empty one. In the present research we studied how textural characteristics affect the perceived size of two-dimensional patterns. We investigated the perceived extension of square textures by manipulating spatial frequency and filling microel...

journal_title：Vision research

authors： Giora E,Gori S

更新日期：2010-11-23 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：:When a colored line connects two black (or differently colored) lines across a gap, colored neon flanks are seen on either side of it. These flanks extend over gap sizes of 50 min arc foveally and are not explained by Bezold-type assimilation. They may be elicited by black lines as short as 6 min arc adjoining the col...

journal_title：Vision research

authors： Redies C,Spillmann L,Kunz K

更新日期：1984-01-01 00:00:00

abstract：:There is an ongoing debate on whether binocular rivalry involves competition among monocular cells or binocular cells. We investigated this issue psychophysically with two specially designed test stimuli. One test stimulus contained monocular motion signals but greatly reduced binocular motion signals, while the other...

journal_title：Vision research

authors： Meng X,Chen Y,Qian N

更新日期：2004-01-01 00:00:00

abstract：:Since the first reports describing the injection of recombinant adeno-associated viral (AAV) vectors in the murine eye, the advancement of the field has been enormous resulting in the correction of several animal models of retinal diseases. The recent development of "pseudotyped" AAV vectors with transduction characte...

journal_title：Vision research

authors： Auricchio A

更新日期：2003-04-01 00:00:00

abstract：:Based on a model of transverse chromatic aberration (TCA) of the eye and perceptual effects previously discussed by the same author, it was predicted that colour induced binocular depth perception (chromostereopsis) is possible from images containing red or blue along with achromatic information (grey and black); that...

journal_title：Vision research

authors： Faubert J

更新日期：1995-11-01 00:00:00

abstract：:Shape primitives have long been proposed as components for object models in the visual system, and account for a considerable body of behavioral findings. While a large amount of effort has been devoted to the study of detection of these parts in the scenes, no research has been undertaken simulating the acquisition o...

journal_title：Vision research

authors： Shams L,von der Malsburg C

更新日期：2002-08-01 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：:Exposure to continuous illumination disrupts normal ocular development in young chicks, causing severe corneal flattening, shallow anterior chambers and progressive hyperopia ('constant light (CL) effects'). We have studied the minimum requirements of a diurnal light cycle to prevent CL effects. (1) Seven groups of 10...

journal_title：Vision research

authors： Li T,Howland HC,Troilo D

更新日期：2000-01-01 00:00:00

abstract：:Models based on spatial-frequency channels and local features provide alternative explanations for suprathreshold pattern discrimination. We compared psychophysical discrimination data with the predictions of the Wilson and Gelb channel model and three local-feature models. The features were peak-valley local contrast...

journal_title：Vision research

authors： Akutsu H,Legge GE

更新日期：1995-10-01 00:00:00