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 processes and Bernoulli trial models which described empirical psychometric functions equally well. Although formally it was impossible to discriminate between these two models, treating observer as a counting device which measures a randomly selected subsample of all available motion elements had certain advantages. According to the Bernoulli trial model decisions about the global motion direction in a range of 12-800 elements were based on taking into account about 4±2 random moving dot elements. This small number is not due to cancellation of the opposite motion vectors since the motion direction recognition performance did not improve after the compared motion directions were made orthogonal. This may indicate that the motion pooling mechanism studied in our experiment is strongly limited in capacity.
journal_name
Vision Resjournal_title
Vision researchauthors
Raidvee A,Averin K,Kreegipuu K,Allik Jdoi
10.1016/j.visres.2011.07.004subject
Has Abstractpub_date
2011-09-01 00:00:00pages
1949-57issue
17eissn
0042-6989issn
1878-5646pii
S0042-6989(11)00241-0journal_volume
51pub_type
杂志文章相关文献
VISION RESEARCH文献大全abstract：:Adaptation is a fundamental property of perceptual processing. In low-level vision, it can calibrate perception to current inputs, increasing coding efficiency and enhancing discrimination around the adapted level. Adaptation also occurs in high-level vision, as illustrated by face aftereffects. However, the functiona...
journal_title：Vision research
pub_type： 杂志文章
doi：10.1016/j.visres.2010.03.003
更新日期：2010-05-12 00:00:00
abstract：:It has been shown that in the initial stages of motion processing, the ON and OFF pathways stay more or less separated. There is evidence that this distinction between motion signals from opposite contrast polarities remains at least partly intact in the integration stage of local motion information. At the same time,...
journal_title：Vision research
pub_type： 杂志文章
doi：10.1016/s0042-6989(00)00065-1
更新日期：2000-01-01 00:00:00
abstract：:We compare improvement through training in vernier acuity under different feedback conditions in order to clarify the role of feedback during learning of a perceptual task and to test different (neural network) models of perceptual learning. Improvement of performance is measured in 49 observers under feedback, no fee...
journal_title：Vision research
pub_type： 杂志文章
doi：10.1016/s0042-6989(97)00043-6
更新日期：1997-08-01 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：:Recognition of objects improves with training, but task performance also improves between sessions without further training. This offline learning seems to be influenced by post-training sleep, as is evidenced in perceptual learning studies with simple stimuli. In this study we aim to investigate the role of sleep in ...
journal_title：Vision research
pub_type： 杂志文章
doi：10.1016/j.visres.2013.10.003
更新日期：2014-06-01 00:00:00
abstract：:If we look out of the window of a travelling train our eyes move rapidly back and forth (saccadic movement). With no attention to individual objects, gaze velocity is low but nystagmic frequency is high (stare nystagmus). If we are interested in individual objects, the angular velocity of gaze is high and the nystagmi...
journal_title：Vision research
pub_type： 杂志文章
doi：10.1016/s0042-6989(98)00212-0
更新日期：1999-04-01 00:00:00
abstract：:We compared reading speed with two fonts, Dutch (serif) and Swiss (sans serif). Text was displayed on a computer monitor, white letters on black, with the RSVP method. Luminance of the letters was either 146.0 or 0.146 cd m-2. Lower-case x-height of the fonts was approximately 5.5 times as large as letter acuity. At t...
journal_title：Vision research
pub_type： 杂志文章
doi：10.1016/s0042-6989(98)00116-3
更新日期：1998-09-01 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
pub_type： 杂志文章
doi：10.1016/s0042-6989(01)00167-5
更新日期：2001-09-01 00:00:00
abstract：PURPOSE:The purpose of this study was to test the response of the mouse eye to two methods for the induction of experimental myopia. METHODS:Growth patterns of eyes were determined by axial length measurements from birth to adult in eyes of both sexes of normal mice examined on post-natal day 1 to 6 months and at 1 ye...
journal_title：Vision research
pub_type： 杂志文章
doi：10.1016/j.visres.2008.01.004
更新日期：2008-03-01 00:00:00
abstract：:Visual localization during saccadic eye movements is prone to error. Flashes shortly before and after the onset of saccades are usually perceived to shift towards the saccade target, creating a "compression" pattern. Typically, the saccade landing point coincides with a salient saccade target. We investigated whether ...
journal_title：Vision research
pub_type： 杂志文章
doi：10.1016/j.visres.2014.04.008
更新日期：2014-07-01 00:00:00
abstract：:In the present study we addressed the issue of whether the Gestalt principle of grouping by similarity (iso-orientation) subtends extraction of straight contours made up of disconnected, iso-oriented Gabor elements, whether collinear (snakes) or parallel (ladders). To prevent the use of the most obvious grouping princ...
journal_title：Vision research
pub_type： 杂志文章
doi：10.1016/j.visres.2012.07.021
更新日期：2012-10-15 00:00:00
abstract：:A two-frequency two-response paradigm was employed. The stimulus on any trial was a compound grating containing two sinusoidal components of different spatial frequencies where the contrast in one or both components could be zero. The observer gave two responses each indicating confidence that one of the two component...
journal_title：Vision research
pub_type： 杂志文章
doi：10.1016/0042-6989(82)90152-3
更新日期：1982-01-01 00:00:00
abstract：:Weber contrast, DeltaL/L, is a widely used contrast metric for aperiodic stimuli. Zele, Cao & Pokorny [Zele, A. J., Cao, D., & Pokorny, J. (2007). Threshold units: A correct metric for reaction time? Vision Research, 47, 608-611] found that neither Weber contrast nor its transform to detection-threshold units equates ...
journal_title：Vision research
pub_type： 杂志文章,随机对照试验
doi：10.1016/j.visres.2008.12.010
更新日期：2009-03-01 00:00:00
abstract：:The dependence of spatial frequency on accommodation has been investigated extensively. Recently, differences between myopes and emmetropes with respect to accommodative microfluctuations for high spatial frequency targets have been reported. Considering the diversity of accommodative responses (ARs) to sinusoidal gra...
journal_title：Vision research
pub_type： 杂志文章
doi：10.1016/j.visres.2015.05.020
更新日期：2015-10-01 00:00:00
abstract：:Retinotopic encoding is preserved in primate visual cortex. However, several physiological and psychophysical studies have revealed that visual processes can be disengaged from retinotopic coordinates. We examined whether this non-retinotopic processing is common to humans and pigeons, two visually dominant vertebrate...
journal_title：Vision research
pub_type： 杂志文章
doi：10.1016/j.visres.2014.08.007
更新日期：2014-10-01 00:00:00
abstract：:The classification behaviour of human observers with respect to compound Gabor signals is tested at foveal and extrafoveal retinal positions. Classification performance is analysed in terms of a probabilistic classification model recently proposed by Rentschler, Jüttner and Caelli [(1994) Vision Research, 34, 669-687]...
journal_title：Vision research
pub_type： 杂志文章
doi：10.1016/0042-6989(95)00250-2
更新日期：1996-04-01 00:00:00
abstract：:Temporal processing limits were determined for two types of stereoscopic percept associated with square wave disparity alternation: apparent depth motion and depth pulsation. The stimuli were dynamic random dot stereograms containing no monocular cues for either target motion or disparity change. The percept of a sing...
journal_title：Vision research
pub_type： 杂志文章
doi：10.1016/0042-6989(84)90037-3
更新日期：1984-01-01 00:00:00
abstract：:Following optic nerve crush in the adult lizard Ctenophorus ornatus, most retinal ganglion cells regrow their axons into visual brain centres: however, the regenerated projections lack retinotopic order and the animals are blind via the experimental eye. Here we have used 3H-thymidine autoradiography to demonstrate th...
journal_title：Vision research
pub_type： 杂志文章
doi：10.1016/s0042-6989(97)00212-5
更新日期：1998-03-01 00:00:00
abstract：:It is well known how early visual experience is critical for the development of multisensory processing abilities, and for this reason an early vision impairment could hinder the transfer of different sensory information during the exploration and recognition of the surrounding environment. Recently, we verified that ...
journal_title：Vision research
pub_type： 杂志文章
doi：10.1016/j.visres.2020.06.008
更新日期：2021-01-01 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
pub_type： 杂志文章
doi：10.1016/j.visres.2014.07.004
更新日期：2015-04-01 00:00:00
abstract：:A large number of studies, using a wide variety of experimental techniques, have investigated the "higher-order" color mechanisms proposed by Krauskopf and colleagues in 1986. Results reviewed here come from studies of chromatic discrimination at threshold, habituation, classification images, spatial alignment and ori...
journal_title：Vision research
pub_type： 杂志文章,评审
doi：10.1016/j.visres.2009.07.005
更新日期：2009-11-01 00:00:00
abstract：:Recent investigations of the three-dimensional (3D) binocular eye positions in near vision have shown that a full characterization of vergence requires incorporation of its torsional component. The latter has a proportional relationship with horizontal vergence and elevation, causing the eyes to have intorsion in near...
journal_title：Vision research
pub_type： 杂志文章
doi：10.1016/0042-6989(95)00161-1
更新日期：1996-03-01 00:00:00
abstract：:A widespread view is that most texture segregation can be accounted for by differences in the spatial frequency content of texture regions. Evidence from both psychophysical and physiological studies indicate, however, that beyond these early filtering stages, there are stages of 3-D boundary segmentation and surface ...
journal_title：Vision research
pub_type： 杂志文章
doi：10.1016/s0042-6989(97)00180-6
更新日期：1998-09-01 00:00:00
abstract：:We studied direction discrimination for lines moving obliquely relative to their orientation. Manipulating contrast, length and duration of motion, we found systematic errors in direction discrimination at low contrast, long length and/or short durations. These errors can be accounted for by a competition between ambi...
journal_title：Vision research
pub_type： 杂志文章
doi：10.1016/0042-6989(93)90209-f
更新日期：1993-06-01 00:00:00
abstract：:Peripheral vision serves to direct our attention and fixation to objects of interest. This requires that the visual system be capable of accurately localizing peripherally presented targets having different spatial structures. The question we address is "to what extent does stimulus spatial structure influence the pre...
journal_title：Vision research
pub_type： 杂志文章
doi：10.1016/0042-6989(95)00343-6
更新日期：1996-12-01 00:00:00
abstract：:We examine how various sources of information contribute to the percept of motion in depth. Subjects were presented with targets moving in depth, and were asked to judge their velocities and final positions. On each presentation, the target's position relative to the two eyes (target vergence), the size of the target'...
journal_title：Vision research
pub_type： 杂志文章
doi：10.1016/0042-6989(95)00146-8
更新日期：1996-03-01 00:00:00
abstract：:Which visual channel detects high spatial frequencies during careful fixation? Color vision models based on psychophysical data contradict electrophysiological results. According to electrophysiology, the channel which mediates foveal acuity originates in the small, tonic color-opponent r-g units of the X-cell pathway...
journal_title：Vision research
pub_type： 杂志文章
doi：10.1016/0042-6989(83)90161-x
更新日期：1983-01-01 00:00:00
abstract：:While it is known that scleral search coils-measuring the rotation of the eye globe--and modern, video based eye trackers-tracking the center of the pupil and the corneal reflection (CR)--produce signals with different properties, the mechanisms behind the differences are less investigated. We measure how the size of ...
journal_title：Vision research
pub_type： 杂志文章
doi：10.1016/j.visres.2016.01.009
更新日期：2016-04-01 00:00:00
abstract：:The present study examined perceptual distortions of a vertical line before and after macular hole (MH) surgery in 25 eyes of 24 patients. Participants' perceptual reports of distortions were classified as solid, bent right/left, thinned at the center, or broken. The majority of patients (72%) reported symmetrical dis...
journal_title：Vision research
pub_type： 临床试验,杂志文章
doi：10.1016/j.visres.2006.07.005
更新日期：2006-11-01 00:00:00
abstract：:A smooth surface imaged on the retina produces a smooth flow field. Thus, the visual system may group regions of smoothly varying flow to segment surfaces. We tested this idea by having observers perform a segmentation task on several stimuli that differed in their 3D interpretations but were all matched in the smooth...
journal_title：Vision research
pub_type： 杂志文章
doi：10.1016/s0042-6989(99)00201-1
更新日期：2000-01-01 00:00:00
