Isolating the effect of one-dimensional motion signals on the perceived direction of moving two-dimensional objects.

abstract：:Physiological and behavioral evidence shows that the directionally preponderant subcortical control of optokinetic nystagmus (OKN) in lower mammals is supplemented in higher mammals by bidirectional cortical control. It is hypothesized that this cortical control allows higher mammals to cope with the parallactic movem...

journal_title：Vision research

authors： Howard IP,Gonzalez EG

更新日期：1987-01-01 00:00:00

abstract：:How does the visual system represent the ensemble statistics of visual objects? This question has received intense interest in vision research, yet most studies have focused on the extraction of mean statistics rather than its dispersion. This study focuses on another aspect of ensemble statistics: the redundancy of t...

journal_title：Vision research

authors： Won BY,Jiang YV

更新日期：2013-01-15 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：:Performance for a variety of visual tasks improves with practice. The purpose of this study was to determine the nature of the processes underlying perceptual learning of identifying letters in peripheral vision. To do so, we tracked changes in contrast thresholds for identifying single letters presented at 10 degrees...

journal_title：Vision research

authors： Chung ST,Levi DM,Tjan BS

更新日期：2005-05-01 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：: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：:We have examined the ability of observers to parse bimodal local-motion distributions into two global motion surfaces, either overlapping (yielding transparent motion) or spatially segregated (yielding a motion boundary). The stimuli were random dot kinematograms in which the direction of motion of each dot was drawn ...

journal_title：Vision research

authors： Smith AT,Curran W,Braddick OJ

更新日期：1999-03-01 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：:The responses of neurons in primary visual cortex (V1) to stimulation of their receptive field (RF) are modulated by stimuli in the RF surround. This modulation is suppressive when the stimuli in the RF and surround are of similar orientation, but less suppressive or facilitatory when they are cross-oriented. Similarl...

journal_title：Vision research

authors： Nurminen L,Angelucci A

更新日期：2014-11-01 00:00:00

abstract：:To investigate amblyopic contrast vision at threshold and above we performed pedestal-masking (contrast discrimination) experiments with a group of eight strabismic amblyopes using horizontal sinusoidal gratings (mainly 3c/deg) in monocular, binocular and dichoptic configurations balanced across eye (i.e. five conditi...

journal_title：Vision research

authors： Baker DH,Meese TS,Hess RF

更新日期：2008-07-01 00:00:00

abstract：:Spatial cueing of transient attention has recently been shown to reduce temporal sensitivity. We investigated how the size of the sustained attentional focus influences double-pulse resolution (DPR) thresholds mapped across the visual field in a sample of 95 healthy subjects using a 9-fold interleaved adaptive algorit...

journal_title：Vision research

authors： Poggel DA,Treutwein B,Calmanti C,Strasburger H

更新日期：2006-09-01 00:00:00

abstract：:The temporal dynamics of brightness filling-in were studied through neural network simulation experiments conducted under visual masking stimulus conditions. Grossberg et al. have specified a filling-in model called the Boundary Contour System/Feature Contour System (BCS/FCS). The BCS generates boundary segmentation, ...

journal_title：Vision research

authors： Arrington KF

更新日期：1994-12-01 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：:Previous studies have shown that attention to a particular stimulus feature, such as direction of motion or color, enhances neuronal responses to unattended stimuli sharing that feature. We studied this effect psychophysically by measuring the strength of the motion aftereffect (MAE) induced by an unattended stimulus ...

journal_title：Vision research

authors： Boynton GM,Ciaramitaro VM,Arman AC

更新日期：2006-09-01 00:00:00

abstract：:A successive asymmetric colour-matching task was used to study the changes in colour appearance of simulated Munsell samples. Colour shifts were induced with two Planckian illuminants, standard illuminant A (u'=0.256, v'=0.524) and illuminant S (u'=0.174, v'=0.392). Measurements were conducted with a 20 degrees field ...

journal_title：Vision research

authors： Murray IJ,Daugirdiene A,Vaitkevicius H,Kulikowski JJ,Stanikunas R

更新日期：2006-10-01 00:00:00

abstract：:We compared sensitivity to first-order versus second-order local motion in patients treated for dense central congenital cataracts in one or both eyes. Amplitude modulation thresholds were measured for discriminating the direction of motion of luminance-modulated (first-order) and contrast modulated (second-order) hor...

journal_title：Vision research

authors： Ellemberg D,Lewis TL,Defina N,Maurer D,Brent HP,Guillemot JP,Lepore F

更新日期：2005-10-01 00:00:00

abstract：:Fixation disparity or vergence noise produce instantaneous vergence errors. These errors are analogous to the imposition of a pedestal disparity, which is known to elevate stereothresholds. In this study, stereothresholds were measured as a function of induced vergence errors in subjects with normal binocular vision. ...

journal_title：Vision research

authors： Ukwade MT,Bedell HE,Harwerth RS

更新日期：2003-01-01 00:00:00

abstract：:Contrast sensitivity for both vertically and obliquely oriented gratings increased with increases in stimulus area to an asymptotic value. Sensitivity grew more slowly for oblique gratings and reached an asymptotic value at a larger area than for vertical gratings. For equal areas, oblique gratings always yielded poor...

journal_title：Vision research

authors： Tootle JS,Berkley MA

更新日期：1983-01-01 00:00:00

abstract：:We examine whether the rules of cyclopean visual direction, as expressed by Hering and others, correctly predict the percept of visual direction for structured visual stimuli. Theoretical inspection of the rules of cyclopean visual direction shows a paradox for the binocular visual directions of stimuli in which objec...

journal_title：Vision research

authors： Erkelens CJ,van de Grind WA

更新日期：1994-11-01 00:00:00

abstract：:The planning of the refixation saccade, i.e. the second saccade on 9- and 11-letter-strings, was assessed in two reading experiments that examined the influence of a length change at different times during the first fixation on a letter string. The results showed that the saccadic system was able to modify the first m...

journal_title：Vision research

authors： Vergilino D,Beauvillain C

更新日期：2000-01-01 00:00:00

abstract：:An individual line or a combination of lines viewed in darkness has a large influence on the elevation to which an observer sets a target so that it is perceived to lie at eye level (VPEL). These influences are systematically related to the orientation of pitched-from-vertical lines on pitched plane(s) and to the leng...

journal_title：Vision research

authors： Matin L,Li W

更新日期：2001-10-01 00:00:00

abstract：:In a series of psychophysical experiments, observers compared the apparent contrast of a dichoptic stimulus (contrast edges of orthogonal orientations in the two eyes) and a monocular stimulus ( a pie pattern in one eye and a blank field in the other eye). When the contrast of the dichoptic stimulus was low (2-3%) the...

journal_title：Vision research

authors： Liu L,Schor CM

更新日期：1995-09-01 00:00:00

abstract：:Prior work suggests that internal features contribute more than external features to face processing. Whether this asymmetry is also true of the mental representations of faces is not known. We used face adaptation to determine whether the internal and external features of faces contribute differently to the represent...

journal_title：Vision research

authors： Hills C,Romano K,Davies-Thompson J,Barton JJ

更新日期：2014-07-01 00:00:00

abstract：:The transient system deficit hypothesis (TSDH) of specific reading disability [Percept. Psychophys. 40 (1986) 440] remains contentious. As part of a study examining multiple measures of transient and sustained system function, heterochromatic flicker matching (HFM) and brightness matching (HBM) were assessed in 30 poo...

journal_title：Vision research

authors： Floyd RA,Dain SJ,Elliott RT

更新日期：2004-01-01 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：: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：:What are the visual causes, rather than mere correlates, of attentional selection and how do they compare to each other during natural vision? To address these questions, we first strung together semantically unrelated dynamic scenes into MTV-style video clips, and performed eye tracking experiments with human observe...

journal_title：Vision research

authors： Carmi R,Itti L

更新日期：2006-12-01 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：:In the classic double-step paradigm, subjects are required to make a saccade to a visual target that is briefly presented at one location and then shifted to a new location before the subject has responded. The saccades in this situation are "reflexive" in that they are made in response to the appearance of the target...

journal_title：Vision research

authors： Sheliga BM,Brown VJ,Miles FA

更新日期：2002-07-01 00:00:00

abstract：:The effects of abrupt increases and decreases of light in one part of the retina on sensitivity in an adjacent part of the retina were studied under low scotopic conditions near absolute threshold. The basic finding is that a brief annular surround decreases sensitivity to test spots occurring near the time of its ons...

journal_title：Vision research

authors： Pulos E,Makous W

更新日期：1982-01-01 00:00:00