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Journal of Vision

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https://www.readbyqxmd.com/read/28719913/texture-density-adaptation-can-be-bidirectional
#1
Hua-Chun Sun, Frederick A A Kingdom, Curtis L Baker
Texture density has previously been thought of as a scalar attribute on the assumption that texture density adaptation only reduces, not enhances, perceived density (Durgin & Huk, 1997). This "unidirectional" property of density adaptation is in contradistinction to the finding that simultaneous density contrast (SDC) is "bidirectional"; that is, not only do denser surrounds reduce the perceived density of a lower density region, but sparser surrounds enhance it (Sun, Baker, & Kingdom, 2016). Here we reexamine the directionality of density adaptation using random dot patterns and a two-alternative forced choice task in which observers compare the perceived density of adapted test patches with unadapted match stimuli...
July 1, 2017: Journal of Vision
https://www.readbyqxmd.com/read/28715575/saccadic-suppression-during-voluntary-versus-reactive-saccades
#2
Svenja Gremmler, Markus Lappe
Saccades are fast eye movements that reorient gaze. They can be performed voluntarily-for example, when viewing a scene-but they can also be triggered in reaction to suddenly appearing targets. The generation of these voluntary and reactive saccades have been shown to involve partially different cortical pathways. However, saccades of either type confront the visual system with a major challenge from massive image motion on the retina. Despite the fact that the whole scene is swept across the retina, a saccade usually does not elicit a percept of motion...
July 1, 2017: Journal of Vision
https://www.readbyqxmd.com/read/28692725/visual-speed-sensitivity-in-the-drum-corps-color-guard
#3
Nestor Matthews, Leslie Welch, F Daniel Coplin, Allison J Murphy, Megan R Puritz
Drum corps color guard experts spend years developing skills in spinning rifles, sabers, and flags. Their expertise provides a unique window into factors that govern sensitivity to the speed of rotational and radial motion. Prior neurophysiological research demonstrates that rotational and radial motion register in the Medial Superior Temporal (MST) region of the primate visual system. To the extent that shared neural events govern rotational and radial speed sensitivity, one would expect expertise on either task to transfer to the other...
July 1, 2017: Journal of Vision
https://www.readbyqxmd.com/read/28672372/on-the-origin-of-sensory-errors-contrast-discrimination-under-temporal-constraint
#4
Jonathan R Flynn, Harel Z Shouval
Estimation of perceptual variables is imprecise and prone to errors. Although the properties of these perceptual errors are well characterized, the physiological basis for these errors is unknown. One previously proposed explanation for these errors is the trial-by-trial variability of the responses of sensory neurons that encode the percept. In order to test this hypothesis, we developed a mathematical formalism that allows us to find the statistical characteristics of the physiological system responsible for perceptual errors, as well as the time scale over which the visual information is integrated...
July 1, 2017: Journal of Vision
https://www.readbyqxmd.com/read/28672371/saccadic-eye-movements-do-not-disrupt-the-deployment-of-feature-based-attention
#5
Zampeta Kalogeropoulou, Martin Rolfs
The tight link of saccades to covert spatial attention has been firmly established, yet their relation to other forms of visual selection remains poorly understood. Here we studied the temporal dynamics of feature-based attention (FBA) during fixation and across saccades. Participants reported the orientation (on a continuous scale) of one of two sets of spatially interspersed Gabors (black or white). We tested performance at different intervals between the onset of a colored cue (black or white, indicating which stimulus was the most probable target; red: neutral condition) and the stimulus...
July 1, 2017: Journal of Vision
https://www.readbyqxmd.com/read/28672370/luminance-noise-as-a-novel-approach-for-measuring-contrast-sensitivity-within-the-magnocellular-and-parvocellular-pathways
#6
Cierra M Hall, J Jason McAnany
This study evaluated the extent to which different types of luminance noise can be used to target selectively the inferred magnocellular (MC) and parvocellular (PC) visual pathways. Letter contrast sensitivity (CS) was measured for three visually normal subjects for letters of different size (0.8°-5.3°) under established paradigms intended to target the MC pathway (steady-pedestal paradigm) and PC pathway (pulsed-pedestal paradigm). Results obtained under these paradigms were compared to those obtained in asynchronous static noise (a field of unchanging luminance noise) and asynchronous dynamic noise (a field of randomly changing luminance noise)...
July 1, 2017: Journal of Vision
https://www.readbyqxmd.com/read/28672369/using-optic-flow-in-the-far-peripheral-field
#7
Meaghan McManus, Sarah D'Amour, Laurence R Harris
Self-motion information can be used to update spatial memory of location through an estimate of a change in position. Viewing optic flow alone can create Illusory self-motion or "vection." Early studies suggested that peripheral vision is more effective than central vision in evoking vection, but controlling for retinal area and perceived distance suggests that all retinal areas may be equally effective. However, the contributions of the far periphery, beyond 90°, have been largely neglected. Using a large-field Edgeless Graphics Geometry display (EGG, Christie, Canada, field of view ±112°) and systematically blocking central (±20° to ±90°) or peripheral (viewing through tunnels ±20° to ±40°) parts of the field, we compared the effectiveness of different retinal regions at evoking forwards linear vection...
July 1, 2017: Journal of Vision
https://www.readbyqxmd.com/read/28672368/perception-of-object-illumination-depends-on-highlights-and-shadows-not-shading
#8
Susan F Te Pas, Sylvia C Pont, Edwin S Dalmaijer, Ignace T C Hooge
Human observers are able to successfully infer direction and intensity of light from photographed scenes despite complex interactions between light, shape, and material. We investigate how well they are able to distinguish other low-level aspects of illumination, such as the diffuseness and the number of light sources. We use photographs of a teapot, an orange, and a tennis ball from the ALOI database (Geusebroek, Burghouts, & Smeulders, 2005) to create different illumination conditions, varying either in diffuseness of a single light source or in separation angle between two distinct light sources...
July 1, 2017: Journal of Vision
https://www.readbyqxmd.com/read/28672367/pupil-dilation-to-illusory-motion-in-peripheral-drift-images-perception-versus-reality
#9
Steve Beukema, Jay A Olson, Ben J Jennings, Frederick A A Kingdom
Peripheral drift is a specific type of illusory motion that causes observers to perceive motion in a static image. We aimed to determine whether pupil dilation occurs during the perception of illusory motion. In three experiments investigating pupil-size changes to peripheral drift, pupil response differences were observed between symmetric patterns (SPs) that elicited no impression of motion and repeated asymmetric patterns (RAPs) that did. All participants reported the perception of motion in the RAP condition and showed significantly greater pupil dilation to these stimuli as compared with viewing stimuli in the SP condition...
July 1, 2017: Journal of Vision
https://www.readbyqxmd.com/read/28662236/earlier-saccades-to-task-relevant-targets-irrespective-of-relative-gain-between-peripheral-and-foveal-information
#10
Christian Wolf, Alexander C Schütz
Saccades bring objects of interest onto the fovea for high-acuity processing. Saccades to rewarded targets show shorter latencies that correlate negatively with expected motivational value. Shorter latencies are also observed when the saccade target is relevant for a perceptual discrimination task. Here we tested whether saccade preparation is equally influenced by informational value as it is by motivational value. We defined informational value as the probability that information is task-relevant times the ratio between postsaccadic foveal and presaccadic peripheral discriminability...
June 1, 2017: Journal of Vision
https://www.readbyqxmd.com/read/28654965/mid-level-perceptual-features-contain-early-cues-to-animacy
#11
Bria Long, Viola S Störmer, George A Alvarez
While substantial work has focused on how the visual system achieves basic-level recognition, less work has asked about how it supports large-scale distinctions between objects, such as animacy and real-world size. Previous work has shown that these dimensions are reflected in our neural object representations (Konkle & Caramazza, 2013), and that objects of different real-world sizes have different mid-level perceptual features (Long, Konkle, Cohen, & Alvarez, 2016). Here, we test the hypothesis that animates and manmade objects also differ in mid-level perceptual features...
June 1, 2017: Journal of Vision
https://www.readbyqxmd.com/read/28654964/evidence-for-unlimited-capacity-processing-of-simple-features-in-visual-cortex
#12
Alex L White, Erik Runeson, John Palmer, Zachary R Ernst, Geoffrey M Boynton
Performance in many visual tasks is impaired when observers attempt to divide spatial attention across multiple visual field locations. Correspondingly, neuronal response magnitudes in visual cortex are often reduced during divided compared with focused spatial attention. This suggests that early visual cortex is the site of capacity limits, where finite processing resources must be divided among attended stimuli. However, behavioral research demonstrates that not all visual tasks suffer such capacity limits: The costs of divided attention are minimal when the task and stimulus are simple, such as when searching for a target defined by orientation or contrast...
June 1, 2017: Journal of Vision
https://www.readbyqxmd.com/read/28654963/visualizing-fmri-bold-responses-to-diverse-naturalistic-scenes-using-retinotopic-projection
#13
Karl Zipser
To view brain activity in register with visual stimuli, a technique here referred to as "retinotopic projection," which translates functional measurements into retinotopic space, is employed. Retinotopic projection is here first applied to a previously acquired fMRI dataset in which a large set of grayscale photos of real scenes were presented to three subjects. A simple model of local contrast integration accounts for much of the data in early visual areas (V1 and V2). However, consistent discrepancies were discovered: Human faces tend to evoke stronger responses relative to other scene elements than predicted by the model, whereas periodic patterns evoke weaker responses than predicted by the model...
June 1, 2017: Journal of Vision
https://www.readbyqxmd.com/read/28654962/the-contribution-of-nonrigid-motion-and-shape-information-to-object-perception-in-pigeons-and-humans
#14
Jean-Francois Nankoo, Christopher R Madan, Jeffrey Sawalha, Douglas R Wylie, Alinda Friedman, Marcia L Spetch, Quoc C Vuong
The ability to perceive and recognize objects is essential to many animals, including humans. Until recently, models of object recognition have primarily focused on static cues, such as shape, but more recent research is beginning to show that motion plays an important role in object perception. Most studies have focused on rigid motion, a type of motion most often associated with inanimate objects. In contrast, nonrigid motion is often associated with biological motion and is therefore ecologically important to visually dependent animals...
June 1, 2017: Journal of Vision
https://www.readbyqxmd.com/read/28654961/labeled-lines-for-image-blur-and-contrast
#15
Michael J Morgan
It has been suggested that blur and contrast discrimination thresholds are limited by a common stage of contrast energy transduction, and that this explains the characteristic "dipper" functions found for contrast and blur discrimination. To test this conjecture, thresholds for discriminating increments from decrements in sharpness/blur, and similarly for contrast, were measured using the same chessboard stimuli with the Method of Single Stimuli (Experiment 1). Using a generic human contrast sensitivity function (HCSF) to calculate energy, thresholds were significantly lower for blur than for contrast...
June 1, 2017: Journal of Vision
https://www.readbyqxmd.com/read/28654960/the-cost-of-making-an-eye-movement-a-direct-link-between-visual-working-memory-and-saccade-execution
#16
Martijn J Schut, Nathan Van der Stoep, Albert Postma, Stefan Van der Stigchel
To facilitate visual continuity across eye movements, the visual system must presaccadically acquire information about the future foveal image. Previous studies have indicated that visual working memory (VWM) affects saccade execution. However, the reverse relation, the effect of saccade execution on VWM load is less clear. To investigate the causal link between saccade execution and VWM, we combined a VWM task and a saccade task. Participants were instructed to remember one, two, or three shapes and performed either a No Saccade-, a Single Saccade- or a Dual (corrective) Saccade-task...
June 1, 2017: Journal of Vision
https://www.readbyqxmd.com/read/28637053/a-new-analytical-method-for-characterizing-nonlinear-visual-processes-with-stimuli-of-arbitrary-distribution-theory-and-applications
#17
Ryusuke Hayashi, Osamu Watanabe, Hiroki Yokoyama, Shin'ya Nishida
Characterization of the functional relationship between sensory inputs and neuronal or observers' perceptual responses is one of the fundamental goals of systems neuroscience and psychophysics. Conventional methods, such as reverse correlation and spike-triggered data analyses are limited in their ability to resolve complex and inherently nonlinear neuronal/perceptual processes because these methods require input stimuli to be Gaussian with a zero mean. Recent studies have shown that analyses based on a generalized linear model (GLM) do not require such specific input characteristics and have advantages over conventional methods...
June 1, 2017: Journal of Vision
https://www.readbyqxmd.com/read/28637052/subtle-eye-movement-metrics-reveal-task-relevant-representations-prior-to-visual-search
#18
Anouk M van Loon, Katya Olmos-Solis, Christian N L Olivers
Visual search is thought to be guided by an active visual working memory (VWM) representation of the task-relevant features, referred to as the search template. In three experiments using a probe technique, we investigated which eye movement metrics reveal which search template is activated prior to the search, and distinguish it from future relevant or no longer relevant VWM content. Participants memorized a target color for a subsequent search task, while being instructed to keep central fixation. Before the search display appeared, we briefly presented two task-irrelevant colored probe stimuli to the left and right from fixation, one of which could match the current target template...
June 1, 2017: Journal of Vision
https://www.readbyqxmd.com/read/28622700/evidence-for-long-range-spatiotemporal-interactions-in-infant-and-adult-visual-cortex
#19
Anthony M Norcia, Francesca Pei, Peter J Kohler
The development of spatiotemporal interactions giving rise to classical receptive field properties has been well studied in animal models, but little is known about the development of putative nonclassical mechanisms in any species. Here we used visual evoked potentials to study the developmental status of spatiotemporal interactions for stimuli that were biased to engage long-range spatiotemporal integration mechanisms. We compared responses to widely spaced stimuli presented either in temporal succession or at the same time...
June 1, 2017: Journal of Vision
https://www.readbyqxmd.com/read/28622699/corrections
#20
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June 1, 2017: Journal of Vision
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