Abstract:
:We used custom-designed acuity tests to compare the magnitude and extent of crowded letter recognition in children and adults. Visual acuity (logMAR) was measured monocularly in children and adults using five custom-designed letter tests with varying degrees of crowding: single letter, single letter surrounded by four flanking bars, single letter surrounded by four flanking letters, line of five letters surrounded by flanking bars, and line of five letters surrounded by flanking letters. The tests were constructed using Sloan letters and presented on an iPad (Apple Incorporated, Cupertino, CA) at 4 m using a standardized endpoint and instructions. Crowded logMAR was normalized to unflanked logMAR and results were analyzed in three groups: younger children aged 4-6 (n = 32), older children, aged 7-9 (n = 30), and adults (n = 27). Both groups of children showed a greater extent of crowding than the adults. The adult participants showed no difference in performance between single or linear presentation and letter or bar flankers. Letter flankers and linear presentation individually resulted in poorer performance in the younger children p < 0.001 and p = 0.003, respectively (mean normalized logMAR 0.17 in each case) and together had an additive effect (mean 0.24), p < 0.001. Crowding in the older children was adult-like except in the linear presentation with letter flankers, p < 0.001. These results indicate that both target-flanker similarity and linear presentation contribute more to foveal crowding in young children than in adults.
journal_name
J Visjournal_title
Journal of visionauthors
Norgett Y,Siderov Jdoi
10.1167/14.12.23subject
Has Abstractpub_date
2014-10-23 00:00:00issue
12issn
1534-7362pii
14.12.23journal_volume
14pub_type
杂志文章abstract::The perception of a bistable stimulus as one or the other interpretation can be biased by prior presentations of that stimulus. Such learning effects have been found to be long lasting even after small amounts of training. The effectiveness of training may be influenced by preexposure to the ambiguous stimulus. Here w...
journal_title:Journal of vision
pub_type: 杂志文章
doi:10.1167/10.8.15
更新日期:2010-07-01 00:00:00
abstract::Blur is an important attribute of human spatial vision, and sensitivity to blur has been the subject of considerable experimental research and theoretical modeling. Often, these models have invoked specialized concepts or mechanisms, such as intrinsic blur, multiple spatial frequency channels, or blur estimation units...
journal_title:Journal of vision
pub_type: 杂志文章,评审
doi:10.1167/11.5.10
更新日期:2011-09-19 00:00:00
abstract::In motion transparency, one surface is very often seen on top of the other in spite of no proper depth cue in the display. We investigated the dynamics of depth assignment in motion transparency stimuli composed of random dots moving in opposite directions. Similarly to other bistable percepts, which surface is seen i...
journal_title:Journal of vision
pub_type: 杂志文章
doi:10.1167/10.13.23
更新日期:2010-11-01 00:00:00
abstract::Spatial processing resolution of a particular object in the visual field can differ considerably due to eye movements. The same object will be represented with high acuity in the fovea but only coarsely in periphery. Herwig and Schneider (in press) proposed that the visual system counteracts such resolution difference...
journal_title:Journal of vision
pub_type: 杂志文章
doi:10.1167/14.11.7
更新日期:2014-09-09 00:00:00
abstract::Animals exploit antagonistic interactions for sensory processing and these can cause oscillations between competing states. Ambiguous sensory inputs yield such perceptual multistability. Despite numerous empirical studies using binocular rivalry or plaid pattern motion, the driving mechanisms behind the spontaneous tr...
journal_title:Journal of vision
pub_type: 杂志文章
doi:10.1167/16.15.6
更新日期:2016-12-01 00:00:00
abstract::Motion can bias the perceived location of a stationary stimulus (Whitney & Cavanagh, 2000), but whether this occurs at a high level of representation or at early, retinotopic stages of visual processing remains an open question. As coding of orientation emerges early in visual processing, we tested whether motion coul...
journal_title:Journal of vision
pub_type: 杂志文章
doi:10.1167/12.8.7
更新日期:2012-01-01 00:00:00
abstract::In order to maintain visual stability during self-motion, the brain needs to update any egocentric spatial representations of the environment. Here, we use a novel psychophysical approach to investigate how and to what extent the brain integrates visual, extraocular, and vestibular signals pertaining to this spatial u...
journal_title:Journal of vision
pub_type: 杂志文章
doi:10.1167/12.12.8
更新日期:2012-11-14 00:00:00
abstract::Culture shapes how people gather information from the visual world. We recently showed that Western observers focus on the eyes region during face recognition, whereas Eastern observers fixate predominantly the center of faces, suggesting a more effective use of extrafoveal information for Easterners compared to Weste...
journal_title:Journal of vision
pub_type: 杂志文章
doi:10.1167/10.6.21
更新日期:2010-06-01 00:00:00
abstract::Visual prostheses for the restoration of functional vision are currently under development. To guide prosthesis research and allow for an accurate prognosis of functional gain, simulating the experience of a retinal prosthesis in healthy individuals is desirable. Current simulation paradigms lack crucial aspects of th...
journal_title:Journal of vision
pub_type: 杂志文章
doi:10.1167/10.14.32
更新日期:2010-12-29 00:00:00
abstract::The essentially active nature of vision has long been acknowledged but has been difficult to investigate because of limitations in the available instrumentation, both for measuring eye and body movements and for presenting realistic stimuli in the context of active behavior. These limitations have been substantially r...
journal_title:Journal of vision
pub_type: 传,历史文章,杂志文章
doi:10.1167/18.4.10
更新日期:2018-04-01 00:00:00
abstract::Human object recognition is remarkably efficient. In recent years, significant advancements have been made in our understanding of how the brain represents visual objects and organizes them into categories. Recent studies using pattern analyses methods have characterized a representational space of objects in human an...
journal_title:Journal of vision
pub_type: 杂志文章
doi:10.1167/13.10.1
更新日期:2013-08-01 00:00:00
abstract::Although visual systems are optimized to deal with the natural visual environment, our understanding of human motion perception is in large part based on the use of artificial stimuli. Here, we assessed observers' ability to estimate the direction of translating natural images and fractals by having them adjust the or...
journal_title:Journal of vision
pub_type: 杂志文章
doi:10.1167/10.11.5
更新日期:2010-09-03 00:00:00
abstract::The standard psychophysical model of our early visual system consists of a linear filter stage, followed by a nonlinearity and an internal noise source. If a rectification mechanism is introduced at the output of the linear filter stage, as has been suggested on some occasions, this model actually predicts that human ...
journal_title:Journal of vision
pub_type: 杂志文章
doi:10.1167/8.9.4
更新日期:2008-07-10 00:00:00
abstract::Many common activities, like reading, scanning scenes, or searching for an inconspicuous item in a cluttered environment, entail serial movements of the eyes that shift the gaze from one object to another. Previous studies have shown that the primate brain is capable of programming sequential saccadic eye movements in...
journal_title:Journal of vision
pub_type: 杂志文章
doi:10.1167/12.3.17
更新日期:2012-03-20 00:00:00
abstract::An increasing number of researchers record binocular eye-tracking signals from participants viewing moving stimuli, but the majority of event-detection algorithms are monocular and do not consider smooth pursuit movements. The purposes of the present study are to develop an algorithm that discriminates between fixatio...
journal_title:Journal of vision
pub_type: 杂志文章
doi:10.1167/16.15.20
更新日期:2016-12-01 00:00:00
abstract::Human observers made local orientation judgments of smoothly shaded surfaces illuminated from different directions by large area lights, both with and without visible smooth occlusion contours. Test-retest correlations between the first and second halves of the experiment revealed that observers' judgments were highly...
journal_title:Journal of vision
pub_type: 杂志文章
doi:10.1167/15.2.24
更新日期:2015-02-24 00:00:00
abstract::Previous contrast discrimination experiments have shown that luminance contrast is summed across ocular (T. S. Meese, M. A. Georgeson, & D. H. Baker, 2006) and spatial (T. S. Meese & R. J. Summers, 2007) dimensions at threshold and above. However, is this process sufficiently general to operate across the conjunction ...
journal_title:Journal of vision
pub_type: 杂志文章
doi:10.1167/11.1.23
更新日期:2011-01-27 00:00:00
abstract::We studied how learning changes the processing of a low-level Gabor stimulus, using a classification-image method (psychophysical reverse correlation) and a task where observers discriminated between slight differences in the phase (relative alignment) of a target Gabor in visual noise. The method estimates the intern...
journal_title:Journal of vision
pub_type: 杂志文章
doi:10.1167/16.10.16
更新日期:2016-08-01 00:00:00
abstract::Human faces look more similar to each other when they are presented upside down, leading to an increase in error rate and response time during individual face discrimination tasks. This face inversion effect (FIE) is one of the most robust findings in the face processing literature. Recent neuroimaging studies using a...
journal_title:Journal of vision
pub_type: 杂志文章
doi:10.1167/7.8.3
更新日期:2007-06-08 00:00:00
abstract::The purpose of this study was to measure the transverse chromatic aberration (TCA) across the visual field of the human eye objectively. TCA was measured at horizontal and vertical field angles out to ±15° from foveal fixation in the right eye of four subjects. Interleaved retinal images were taken at wavelengths 543 ...
journal_title:Journal of vision
pub_type: 杂志文章
doi:10.1167/16.14.9
更新日期:2016-11-01 00:00:00
abstract::Does human vision show the contrast invariance expected of an ideal stereoscopic system for computing depth from disparity? We used random-dot stereograms to investigate the luminance contrast effect on perceived depth from disparity. The perceived depth of disparity corrugations was measured by adjusting the length o...
journal_title:Journal of vision
pub_type: 杂志文章
doi:10.1167/16.11.20
更新日期:2016-09-01 00:00:00
abstract::Accommodation and vergence help maintain single and focused visual experience while an object moves in depth. The relative importance of retinal blur and disparity, the primary sensory cues to accommodation and vergence, is largely unknown during development; a period when growth of the eye and head necessitate contin...
journal_title:Journal of vision
pub_type: 杂志文章
doi:10.1167/8.16.14
更新日期:2008-12-22 00:00:00
abstract::Understanding the current status and historical trends of gender representation within a research field is an important component of fostering a diverse and inclusive scientific community. Here, we report on the gender representation of a large sample of the vision science research community--the attendees of the Annu...
journal_title:Journal of vision
pub_type: 杂志文章
doi:10.1167/16.1.17
更新日期:2016-01-01 00:00:00
abstract::The role of target typicality in a categorical visual search task was investigated by cueing observers with a target name, followed by a five-item target present/absent search array in which the target images were rated in a pretest to be high, medium, or low in typicality with respect to the basic-level target cue. C...
journal_title:Journal of vision
pub_type: 杂志文章
doi:10.1167/14.12.1
更新日期:2014-10-01 00:00:00
abstract::Contrast discrimination functions for simple gratings famously look like a dipper. Discrimination thresholds are lower than detection thresholds for moderate pedestal contrasts, and the rate of growth of thresholds as the pedestal contrast gets larger typically lies between the values implied by two popular treatments...
journal_title:Journal of vision
pub_type: 杂志文章,评审
doi:10.1167/11.14.9
更新日期:2011-12-08 00:00:00
abstract::Performance on interval timing is often explained by the assumption of an internal clock based on neural counting. According to this account, a neural pacemaker generates pulses, and the number of pulses relating to a physical time interval is recorded by a counter. Thus, the number of accumulated pulses is the intern...
journal_title:Journal of vision
pub_type: 杂志文章
doi:10.1167/15.3.5
更新日期:2015-03-10 00:00:00
abstract::Kittens reared with mixed daily visual input that consists of episodes of normal (binocular) exposure followed by abnormal (monocular) exposure can develop normal visual acuity in both eyes if the length of the former exposure exceeds a critical amount. However, later studies of the tuning of cells in primary visual c...
journal_title:Journal of vision
pub_type: 杂志文章
doi:10.1167/9.5.22
更新日期:2009-05-21 00:00:00
abstract::For the linear discrimination of two stimuli in white Gaussian noise in the presence of internal noise, a method is described for estimating linear classification weights from the sum of noise images segregated by stimulus and response. The recommended method for combining the two response images for the same stimulus...
journal_title:Journal of vision
pub_type: 杂志文章
doi:10.1167/2.1.8
更新日期:2002-01-01 00:00:00
abstract::When two verniers are presented in rapid succession at the same location, feature fusion occurs. Instead of perceiving two separate verniers, participants typically report perceiving one fused vernier, whose offset is a combination of the two previous verniers, with the later one slightly dominating. Here, we examined...
journal_title:Journal of vision
pub_type: 杂志文章
doi:10.1167/18.6.20
更新日期:2018-06-01 00:00:00
abstract::Human observers can determine whether natural scenes contain an animal or not on the basis of as little as 20 ms viewing; a phenomenon termed ultra-rapid categorization (URC). Recent studies have suggested that URC is unimpaired even when attention resources are concurrently devoted to a second task. This apparent ind...
journal_title:Journal of vision
pub_type: 杂志文章
doi:10.1167/8.4.21
更新日期:2008-04-23 00:00:00