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 a feature comparison task; subjects identified matching features that belonged either to the same apparent object (within-object condition) or to different apparent objects (between-object condition). The stimulus was backward-masked at a variable SOA, to examine the consequences of changes in the perceptual organization of the segments over time. Critical to our aims, the two objects composing our stimulus were occluded to a variable extent, so that differences in within-object and between-object performance could be unequivocally related to the formation of objects. For certain stimulus arrangements, we found superior performance for within-object matches. The pattern of performance was, however, highly dependent on the stimulus orientation and was not related to the strength of the object percept. Using an oblique stimulus arrangement, we observed superior between-object comparisons that did vary with the object percept. We conclude that performance in our feature comparison task is strongly influenced by spatial relations between features that are independent of object properties. Indeed, this dominating effect may hide an underlying mechanism whereby formation of a visual object suppresses comparison of distinct features within the object.
journal_name
Vision Resjournal_title
Vision researchauthors
Harrison SJ,Feldman Jdoi
10.1016/j.visres.2009.08.014subject
Has Abstractpub_date
2009-11-01 00:00:00pages
2790-9issue
23eissn
0042-6989issn
1878-5646pii
S0042-6989(09)00375-7journal_volume
49pub_type
杂志文章相关文献
VISION RESEARCH文献大全abstract：:Image stability during self-motion is achieved via a combination of the optokinetic and vestibulo-ocular reflexes (OKR and VOR). To determine whether distinct neuronal mechanisms are used to calibrate eye movements driven by visual and vestibular signals, we examined the developmental maturation and adaptive plasticit...
journal_title：Vision research
pub_type： 杂志文章
doi：10.1016/j.visres.2004.09.006
更新日期：2004-12-01 00:00:00
abstract：:Perceptual facilitation in detecting low-contrast Gabor patches (GPs) is induced by collinearly oriented high-contrast flankers. Our recent Visual Evoked Potentials (VEPs) study provided new physiological evidence for these collinear interactions, reflected by nonlinear modulation of multiple waveform components and f...
journal_title：Vision research
pub_type： 临床试验,杂志文章
doi：10.1016/j.visres.2009.04.013
更新日期：2009-07-01 00:00:00
abstract：:In previous eye movement research on word length effects, spatial width has been confounded with the number of letters. McDonald (2006) unconfounded these factors by rendering all words in sentences in constant spatial width. In the present study, the Arial font with proportional letter spacing was used for varying th...
journal_title：Vision research
pub_type： 杂志文章
doi：10.1016/j.visres.2011.05.015
更新日期：2011-08-01 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
pub_type： 杂志文章
doi：10.1016/0042-6989(86)90129-x
更新日期：1986-01-01 00:00:00
abstract：:We investigated the effect of adaptation on orientation discrimination using two experienced observers, then replicated the main effects using a total of 50 naïve subjects. Orientation discrimination around vertical improved after adaptation to either horizontal or vertical gratings, but was impaired by adaptation at ...
journal_title：Vision research
pub_type： 杂志文章
doi：10.1016/s0042-6989(00)00248-0
更新日期：2001-01-15 00:00:00
abstract：:During scene perception our eyes generate complex sequences of fixations. Predictors of fixation locations are bottom-up factors such as luminance contrast, top-down factors like viewing instruction, and systematic biases, e.g., the tendency to place fixations near the center of an image. However, comparatively little...
journal_title：Vision research
pub_type： 杂志文章
doi：10.1016/j.visres.2016.09.012
更新日期：2016-12-01 00:00:00
abstract：:Color appearance can be studied using either Maxwellian-view optical systems or natural viewing (Newtonian-view). We show that the results are not precisely comparable when the natural pupil is appreciably larger than the entrance pupil of the Maxwellian beam. The wavelength for any given hue that is obtained from one...
journal_title：Vision research
pub_type： 杂志文章
doi：10.1016/j.visres.2008.06.004
更新日期：2008-08-01 00:00:00
abstract：:The contrast transfer function (CTF) of the pattern electroretinogram (PERG) depends on temporal frequency. For transient stimulation it is fully linear; at faster stimulation rates it becomes strongly non-linear with an accelerated shape. In this study we investigated a range of stimulus parameters with the aim of st...
journal_title：Vision research
pub_type： 杂志文章
doi：10.1016/j.visres.2007.04.009
更新日期：2007-07-01 00:00:00
abstract：:We evaluated the level of intraocular light scatter in a group of patients with retinitis pigmentosa (RP) who had minimal or no lens opacities, since such patients not infrequently complain of photoaversion. Intraocular light scatter was measured in 20 patients with RP who were < 60 years of age and who had no more th...
journal_title：Vision research
pub_type： 杂志文章
doi：10.1016/0042-6989(96)00068-5
更新日期：1996-11-01 00:00:00
abstract：:The presence of retinopetal fibers in mammals has been debated many times in the past two decades. Do rabbits have a retinopetal system? This question is addressed with the present investigations. In anesthetized and paralysed rabbits the b-wave and the oscillatory potentials (OP) are recorded at the cornea. The optic...
journal_title：Vision research
pub_type： 杂志文章
doi：10.1016/0042-6989(89)90110-7
更新日期：1989-01-01 00:00:00
abstract：:(-)[3H]Noradrenaline and [3H]clonidine bind in a saturable fashion to membrane preparations of bovine retinas. The dissociation constant for (-)[3H]noradrenaline is about 26 nM and for [3H]clonidine approximately 11.7 nM. The degree of (-)[3H]noradrenaline and [3H]clonidine binding associated with subcellular fraction...
journal_title：Vision research
pub_type： 杂志文章
doi：10.1016/0042-6989(82)90230-9
更新日期：1982-01-01 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
pub_type： 杂志文章
doi：10.1016/j.visres.2005.02.005
更新日期：2005-07-01 00:00:00
abstract：:The nominally steady-state accommodation response exhibits temporal variations which can be characterized by two dominant regions of activity; a low frequency component (LFC < 0.6 Hz) and a high frequency component (1.0 < or = HFC < or = 2.1 Hz). There is no consensus as to the relative contribution made by each of th...
journal_title：Vision research
pub_type： 杂志文章
doi：10.1016/0042-6989(93)90007-j
更新日期：1993-10-01 00:00:00
abstract：:Photoreception in echinoderms has been studied for several years with a focus on the dermal photoreceptors of echinoids. Even though spatial vision has been proposed for this dermal photosystem, by far the most advanced system is found in a number of asteroids where an unpaired tube foot at the tip of each arm carries...
journal_title：Vision research
pub_type： 杂志文章
doi：10.1016/j.visres.2016.05.007
更新日期：2016-10-01 00:00:00
abstract：:The processing of letters within strings is challenging for beginning readers. Letter identification is affected by visual similarity, loss of information with eccentricity and interference from nearby letters. In contrast, visual attention enhances letter identification. We here explored whether visual attention reso...
journal_title：Vision research
pub_type： 杂志文章
doi：10.1016/j.visres.2019.10.011
更新日期：2019-12-01 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
pub_type： 杂志文章
doi：10.1016/0042-6989(95)00009-o
更新日期：1995-09-01 00:00:00
abstract：:Morphological patterns of the retina, cone size and density, rod density, rod-cone ratio, ganglion cell density, convergence of receptor cells, resolving power (RP) and regionalization were examined throughout life history in roach and in adults of asp, bream, common carp, roach and sabre carp. The retina of hatchling...
journal_title：Vision research
pub_type： 杂志文章
doi：10.1016/0042-6989(91)90091-i
更新日期：1991-01-01 00:00:00
abstract：:We determined normative values for the visual sensitivity threshold in 118 children aged 5-8 years, using automated static perimetry (Octopus 2000R, program 32). In addition, 17 normal adults were tested. The children first underwent a familiarization procedure. One week later, quantitative examination was performed a...
journal_title：Vision research
pub_type： 杂志文章
doi：10.1016/s0042-6989(97)00369-6
更新日期：1998-07-01 00:00:00
abstract：:We compared the effectiveness of central and peripheral targets in a saccadic countermanding task. Stop-signal reaction times (SSRTs) do not differ significantly for central and peripheral stop signals. Further, when central and peripheral stop signals are presented together, SSRTs behave as expected of independent pr...
journal_title：Vision research
pub_type： 杂志文章
doi：10.1016/s0042-6989(01)00107-9
更新日期：2001-09-01 00:00:00
abstract：:A geometrical method of calculating retinal magnification factor at the limits of the retinal field, adjacent to the ora terminalis, is described. The method is applied to the eyes of 11 mammalian and avian species, using new anatomical measurements and data from the literature. In the human and monkey eye, magnificat...
journal_title：Vision research
pub_type： 杂志文章
doi：10.1016/0042-6989(87)90198-2
更新日期：1987-01-01 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
pub_type： 杂志文章
doi：10.1016/0042-6989(84)90083-x
更新日期：1984-01-01 00:00:00
abstract：:The influence of binocular disparate targets on the perceived visual direction of adjacent monocular targets has been termed "binocular capture". The magnitude of capture increases significantly with increasing vertical separation between monocular targets. This study sets out to elucidate the interaction between spat...
journal_title：Vision research
pub_type： 杂志文章
doi：10.1016/j.visres.2011.09.011
更新日期：2011-12-08 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
pub_type： 杂志文章
doi：10.1016/s0042-6989(01)00300-5
更新日期：2002-03-01 00:00:00
abstract：:Gratings that differ in orientation by as much as 62.5 deg from that of a signal grating raise the signal's threshold by nearly a log unit. The spatial-frequency tuning of the masking effect reaches a maximum slightly below the spatial frequency of the maskers but far from that of any quadratic distortion product. Fur...
journal_title：Vision research
pub_type： 杂志文章
doi：10.1016/0042-6989(89)90127-2
更新日期：1989-01-01 00:00:00
abstract：:The number of axons in the optic nerve have been examined in rat pups raised by control or taurine-depleted mothers, at 21, 28 and 40 days after birth. Optic nerves from the mother rats were also studied. Taurine depletion of dams and some litters after weaning was achieved by in vivo treatment with guanidinoethyl sul...
journal_title：Vision research
pub_type： 杂志文章
doi：10.1016/0042-6989(88)90133-2
更新日期：1988-01-01 00:00:00
abstract：:Several characteristic of aftereffects (especially the motion aftereffect) depend upon the square root of the time spent adapting. The same parameters are here examined for the contrast threshold elevation aftereffect. The time taken to recover is shown to be well predicted by root adaptation time (beyond a minimum du...
journal_title：Vision research
pub_type： 信件
doi：10.1016/0042-6989(92)90171-e
更新日期：1992-09-01 00:00:00
abstract：:Bisection is one of several spatial localization tasks that achieve hyperacuity performance levels. We find that optimal bisection thresholds, and hyperacuity tasks in general, are no better than might be expected from simple contrast detection and discrimination performance. The three-line bisection task can be descr...
journal_title：Vision research
pub_type： 杂志文章
doi：10.1016/s0042-6989(98)00121-7
更新日期：1999-02-01 00:00:00
abstract：:We examined the velocity dependence of the vergence and version eye movements elicited by motion stimuli that were symmetric or asymmetric at the two eyes. Movements of both eyes were recorded with the scleral search coil technique. Vergence was computed as the difference in the positions of the two eyes (left-right) ...
journal_title：Vision research
pub_type： 杂志文章
doi：10.1016/s0042-6989(02)00334-6
更新日期：2002-11-01 00:00:00
abstract：:Foveal pathway visual function was assessed in 11 patients having tumours extending into the suprasellar region but without evidence of visual impairment as assessed by visual acuity and Bjerrum screen campimetry. Psychophysical and routine visual evoked potential (VEP) measurements were obtained from the eye ipsilate...
journal_title：Vision research
pub_type： 杂志文章
doi：10.1016/s0042-6989(96)00306-9
更新日期：1997-05-01 00:00:00
abstract：PURPOSE:The mouse eye has potential to become an important model for studies on the genetic control of eye growth and myopia. However, no data are published on the development of its optical properties. We developed a paraxial schematic model of the growing eye for the most common laboratory mouse strain, the C57BL/6 m...
journal_title：Vision research
pub_type： 杂志文章
doi：10.1016/j.visres.2004.03.011
更新日期：2004-01-01 00:00:00
