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Journal of Vision

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https://www.readbyqxmd.com/read/28800369/feature-singletons-attract-spatial-attention-independently-of-feature-priming
#1
Amit Yashar, Alex L White, Wanghaoming Fang, Marisa Carrasco
People perform better in visual search when the target feature repeats across trials (intertrial feature priming [IFP]). Here, we investigated whether repetition of a feature singleton's color modulates stimulus-driven shifts of spatial attention by presenting a probe stimulus immediately after each singleton display. The task alternated every two trials between a probe discrimination task and a singleton search task. We measured both stimulus-driven spatial attention (via the distance between the probe and singleton) and IFP (via repetition of the singleton's color)...
August 1, 2017: Journal of Vision
https://www.readbyqxmd.com/read/28800368/unpredictability-does-not-hamper-nonretinotopic-motion-perception
#2
Marc M Lauffs, Haluk Ögmen, Michael H Herzog
The motion of parts of an object is usually perceived relative to the object, i.e., nonretinotopically, rather than in retinal coordinates. For example, we perceive a reflector to rotate on the wheel of a moving bicycle even though its trajectory is cycloidal on the retina. The rotation is perceived because the motion of the object (bicycle) is discounted from the motion of its parts (reflector). It seems that the visual system can easily compute the object motion and subtract it from the part motion. Bikes move usually rather predictably...
August 1, 2017: Journal of Vision
https://www.readbyqxmd.com/read/28800367/a-new-method-for-mapping-perceptual-biases-across-visual-space
#3
Nonie J Finlayson, Andriani Papageorgiou, D Samuel Schwarzkopf
How we perceive the environment is not stable and seamless. Recent studies found that how a person qualitatively experiences even simple visual stimuli varies dramatically across different locations in the visual field. Here we use a method we developed recently that we call multiple alternatives perceptual search (MAPS) for efficiently mapping such perceptual biases across several locations. This procedure reliably quantifies the spatial pattern of perceptual biases and also of uncertainty and choice. We show that these measurements are strongly correlated with those from traditional psychophysical methods and that exogenous attention can skew biases without affecting overall task performance...
August 1, 2017: Journal of Vision
https://www.readbyqxmd.com/read/28793353/what-thedress-reveals-about-the-role-of-illumination-priors-in-color-perception-and-color-constancy
#4
Stacey Aston, Anya Hurlbert
The disagreement between people who named #theDress (the Internet phenomenon of 2015) "blue and black" versus "white and gold" is thought to be caused by individual differences in color constancy. It is hypothesized that observers infer different incident illuminations, relying on illumination "priors" to overcome the ambiguity of the image. Different experiences may drive the formation of different illumination priors, and these may be indicated by differences in chronotype. We assess this hypothesis, asking whether matches to perceived illumination in the image and/or perceived dress colors relate to scores on the morningness-eveningness questionnaire (a measure of chronotype)...
August 1, 2017: Journal of Vision
https://www.readbyqxmd.com/read/28768318/hue-shifts-produced-by-temporal-asymmetries-in-chromatic-signals-depend-on-the-alignment-of-the-first-and-second-harmonics
#5
Andrew Stockman, G Bruce Henning, Peter West, Andrew T Rider, Caterina Ripamonti
When M- or L-cone-isolating sawtooth waveforms flicker at frequencies between 4 and 13.3 Hz, there is a mean hue shift in the direction of the shallower sawtooth slope. Here, we investigate how this shift depends on the alignment of the first and second harmonics of sawtooth-like waveforms. Below 4 Hz, observers can follow hue variations caused by both harmonics, and reliably match reddish and greenish excursions. At higher frequencies, however, the hue variations appear as chromatic flicker superimposed on a steady light, the mean hue of which varies with second-harmonic alignment...
August 1, 2017: Journal of Vision
https://www.readbyqxmd.com/read/28768317/hue-shifts-produced-by-temporal-asymmetries-in-chromatic-signals
#6
Andrew Stockman, G Bruce Henning, Peter West, Andrew T Rider, Hannah E Smithson, Caterina Ripamonti
Observers viewed M- or L-cone-isolating stimuli and compared slowly-on and slowly-off sawtooth waveforms of the same mean chromaticity and luminance. Between 6 and 13 Hz, the mean hue of slowly-on L-cone and slowly-off M-cone sawtooth flicker appeared redder, and the mean hue of slowly-off L-cone and slowly-on M-cone sawtooth stimuli appeared greener-despite all the waveforms' having the same mean, near-yellow-appearing chromaticity. We measured the effect of the modulation depth and the slope of the sawtooth on the mean hue shifts as a function of temporal frequency...
August 1, 2017: Journal of Vision
https://www.readbyqxmd.com/read/28763527/speed-size-illusion-correlates-with-retinal-level-motion-statistics
#7
Zixin Yong, Po-Jang Hsieh
It is a common perceptual experience that smaller objects appear to move faster than larger ones when their physical speeds are the same in either the laboratory or daily life. In this study, we show that the speed-size illusion is correlated with retinal image speed distribution bias. The illusion was quantified with a two-alternative, forced choice speed comparison paradigm, and retinal image speed distributions for different image sizes were obtained by simulation. Simulation results show that smaller retinal images tend to have slower projected speed, and the retinal image speed distribution bias correlates with the strength of the speed-size illusion...
August 1, 2017: Journal of Vision
https://www.readbyqxmd.com/read/28753686/understanding-individual-differences-in-color-appearance-of-thedress-based-on-the-optimal-color-hypothesis
#8
Keiji Uchikawa, Takuma Morimoto, Tomohisa Matsumoto
We performed a theoretical analysis based on our optimal color hypothesis to explain why "#TheDress" image had a different color appearance for different observers (observer-dependent perception). We then carried out an experiment to test the hypothesis derived from the aforementioned theoretical analysis. In the optimal color hypothesis, the visual system picks the optimal color distribution that provides the best fit to the luminance distribution at a scene. The peak of the best-fit optimal color distribution corresponds with the illuminant's color temperature...
July 1, 2017: Journal of Vision
https://www.readbyqxmd.com/read/28719913/texture-density-adaptation-can-be-bidirectional
#9
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
#10
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
#11
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
#12
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
#13
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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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