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https://www.readbyqxmd.com/read/28525805/typical-integration-of-emotion-cues-from-bodies-and-faces-in-autism-spectrum-disorder
#1
Rebecca Brewer, Federica Biotti, Geoffrey Bird, Richard Cook
Contextual cues derived from body postures bias how typical observers categorize facial emotion; the same facial expression may be perceived as anger or disgust when aligned with angry and disgusted body postures. Individuals with Autism Spectrum Disorder (ASD) are thought to have difficulties integrating information from disparate visual regions to form unitary percepts, and may be less susceptible to visual illusions induced by context. The current study investigated whether individuals with ASD exhibit diminished integration of emotion cues extracted from faces and bodies...
May 16, 2017: Cognition
https://www.readbyqxmd.com/read/28523448/erratum-to-voluntary-action-alters-the-perception-of-visual-illusions
#2
Matti Vuorre, Janet Metcalfe
No abstract text is available yet for this article.
May 18, 2017: Attention, Perception & Psychophysics
https://www.readbyqxmd.com/read/28522968/the-effect-of-visual-spatial-and-temporal-manipulations-on-embodiment-and-action
#3
Natasha Ratcliffe, Roger Newport
The feeling of owning and controlling the body relies on the integration and interpretation of sensory input from multiple sources with respect to existing representations of the bodily self. Illusion paradigms involving multisensory manipulations have demonstrated that while the senses of ownership and agency are strongly related, these two components of bodily experience may be dissociable and differentially affected by alterations to sensory input. Importantly, however, much of the current literature has focused on the application of sensory manipulations to external objects or virtual representations of the self that are visually incongruent with the viewer's own body and which are not part of the existing body representation...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28496425/verbalizations-affect-visuomotor-control-in-hitting-objects-to-distant-targets
#4
Raimey Olthuis, John Van Der Kamp, Simone Caljouw
There is a long-standing proposal for the existence of two neuroanatomically and functionally separate visual systems; one supported by the dorsal pathway to control action and the second supported by the ventral pathway to handle explicit perceptual judgments. The dorsal pathway requires fast access to egocentric information, while the ventral pathway primarily requires allocentric information. Despite the evidence for functionally distinct systems, researchers have posited important interactions. This paper examines evidence to what degree the interaction becomes more important when target-identity, the perception of which is supported by the ventral stream, is verbalized during the execution of a target-directed far-aiming movement...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28474267/the-open-object-illusion-size-perception-is-greatly-influenced-by-object-boundaries
#5
Tal Makovski
This study presents a new powerful visual illusion, in which simple "open" objects-ones with missing boundaries-are perceived as bigger than the same size, fully "closed" objects. In a series of experiments that employed a continuous-response adjustment procedure, it was found that the lack of vertical boundaries inflated the perceived width of an object, whereas the lack of horizontal boundaries inflated its perceived length. The effect was highly robust and it was replicated across different stimulus types and experimental parameters, with almost all observers exhibiting a strong effect...
May 4, 2017: Attention, Perception & Psychophysics
https://www.readbyqxmd.com/read/28473908/the-silhouette-zoetrope-a-new-blend-of-motion-mirroring-depth-and-size-illusions
#6
Christine Veras, Quang-Cuong Pham, Gerrit W Maus
Here, we report a novel combination of visual illusions in one stimulus device, a contemporary innovation of the traditional zoetrope, called Silhouette Zoetrope. In this new device, an animation of moving silhouettes is created by sequential cutouts placed outside a rotating empty cylinder, with slits illuminating the cutouts successively from the back. This "inside-out" zoetrope incurs the following visual effects: the resulting animated figures are perceived (a) horizontally flipped, (b) inside the cylinder, and (c) appear to be of different size than the actual cutout object...
March 2017: I-Perception
https://www.readbyqxmd.com/read/28467169/the-effects-of-optical-illusions-in-perception-and-action-in-peripersonal-and-extrapersonal-space
#7
Jaeho Shim, John van der Kamp
While the two visual system hypothesis tells a fairly compelling story about perception and action in peripersonal space (i.e., within arm's reach), its validity for extrapersonal space is very limited and highly controversial. Hence, the present purpose was to assess whether perception and action differences in peripersonal space hold in extrapersonal space and are modulated by the same factors. To this end, the effects of an optic illusion in perception and action in both peripersonal and extrapersonal space were compared in three groups that threw balls toward a target at a distance under different target eccentricity (i...
January 1, 2017: Perception
https://www.readbyqxmd.com/read/28454717/errors-in-interception-can-be-predicted-from-errors%C3%A2-in-perception
#8
Cristina de la Malla, Jeroen B J Smeets, Eli Brenner
It has been hypothesised that our actions are less susceptible to visual illusions than our perceptual judgements because similar information is processed for perception and action in separate pathways. We test this hypothesis for subjects intercepting a moving object that appears to move at a different speed than its true speed due to an illusion. The object was a moving Gabor patch: a sinusoidal grating of which the luminance contrast is modulated by a two-dimensional Gaussian. We manipulated the patch's apparent speed by moving the grating relative to the Gaussian...
April 3, 2017: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/28451998/voluntary-action-alters-the-perception-of-visual-illusions
#9
Matti Vuorre, Janet Metcalfe
"Intentional binding" refers to the finding that people judge voluntary actions and their effects as having occurred closer together in time than two passively observed events. If this effect reflects subjectively compressed time, then time-dependent visual illusions should be altered by voluntary initiation. To test this hypothesis, we showed participants displays that result in particular motion illusions when presented at short interstimulus intervals (ISIs). In Experiment 1 we used apparent motion, which is perceived only at very short ISIs; Experiments 2a and 2b used the Ternus display, which results in different motion illusions depending on the ISI...
April 27, 2017: Attention, Perception & Psychophysics
https://www.readbyqxmd.com/read/28447849/a-large-scale-horizontal-vertical-illusion-produced-with-small-objects-separated-in-depth
#10
Zhi Li, Frank H Durgin
We conducted two experiments (total N = 81) to investigate the basis for the large-scale horizontal-vertical illusion (HVI), which is typically measured as 15%-20% and has previously been linked to the presence of a ground plane. In a preliminary experiment, vertical rods of similar angular extents that were either large (4.5-7.5 m) and far, or small (0.9-1.5 m) and near, were matched to horizontal extents in a virtual environment by adjustment of horizontal gaps or rods. Large/far objects showed a larger HVI (∼13%) than did small objects (∼7%), as has been shown before, but the horizontal gap normally used to measure the large-scale HVI was not the source of the larger bias...
April 27, 2017: Journal of Experimental Psychology. Human Perception and Performance
https://www.readbyqxmd.com/read/28447846/attentional-state-modulates-the-effect-of-an-irrelevant-stimulus-dimension-on-perception
#11
Björn Herrmann, Ingrid S Johnsrude
Covariations of acoustic features provide redundancy in rapidly changing soundscapes: Hearing one feature enables a listener to infer another if these 2 features normally covary. However, it is unknown whether situational demands affect the degree to which covariations influence perceptual inferences. We exploited a perceptual interdependency between modulation rate and frequency and examined, in 6 experiments, whether challenging situations would alter the degree to which people rely on frequency information to make decisions about modulation rate...
April 27, 2017: Journal of Experimental Psychology. Human Perception and Performance
https://www.readbyqxmd.com/read/28434380/high-poly-to-low-poly-workflows-for-real-time-rendering
#12
Nicky L Webster
This paper outlines a digital workflow that allows artists to add visual detail to 3D models whilst adhering to the strict polygonal budget that is vital to successfully render in real-time. Two versions of a model - a high-poly model, and a low-poly model - are produced to create a 2D normal map through a process known as 'baking', to achieve the illusion of the high resolution detail on the low-resolution model.
January 2017: Journal of Visual Communication in Medicine
https://www.readbyqxmd.com/read/28423412/brief-presentation-enhances-various-simultaneous-contrast-effects
#13
Sae Kaneko, Stuart Anstis, Ichiro Kuriki
Kaneko and Murakami (2012) demonstrated that simultaneous contrast for brightness and color (chromatic saturation) were enhanced by flashing the stimulus very briefly (10 ms). Here we examined whether this effect of duration generalized to other visual features. Tilt illusion and simultaneous hue contrast were both shown to be much stronger with a stimulus duration of 10 ms compared with 500 ms. The similar temporal dynamics for simultaneous contrast across visual features suggest common underlying principles...
April 1, 2017: Journal of Vision
https://www.readbyqxmd.com/read/28420952/motion-induced-position-shifts-activate-early-visual-cortex
#14
Peter J Kohler, Patrick Cavanagh, Peter U Tse
The ability to correctly determine the position of objects in space is a fundamental task of the visual system. The perceived position of briefly presented static objects can be influenced by nearby moving contours, as demonstrated by various illusions collectively known as motion-induced position shifts. Here we use a stimulus that produces a particularly strong effect of motion on perceived position. We test whether several regions-of-interest (ROIs), at different stages of visual processing, encode the perceived rather than retinotopically veridical position...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28416095/self-and-other-agency-in-people-with-passivity-first-rank-symptoms-in-schizophrenia
#15
Kyran T Graham-Schmidt, Mathew T Martin-Iverson, Flavie A V Waters
Individuals with passivity (first-rank) symptoms report that their actions, thoughts and sensations are influenced or controlled by an external (non-self) agent. Passivity symptoms are closely linked to schizophrenia and related disorders yet they remain poorly understood. One dominant framework posits a role for deficits in the sense of agency. An important question is whether deficits in self-agency can be differentiated from other-agency in schizophrenia and passivity symptoms. This study aimed to evaluate self- and other-agency in 51 people with schizophrenia (n=20 current, 10 past, 21 no history of passivity symptoms), and 48 healthy controls...
April 13, 2017: Schizophrenia Research
https://www.readbyqxmd.com/read/28392764/eye-tracking-reveals-that-the-strength-of-the-vertical-horizontal-illusion-increases-as-the-retinal-image-becomes-more-stable-with-fixation
#16
Philippe A Chouinard, Hayden J Peel, Oriane Landry
The closer a line extends toward a surrounding frame, the longer it appears. This is known as a framing effect. Over 70 years ago, Teodor Künnapas demonstrated that the shape of the visual field itself can act as a frame to influence the perceived length of lines in the vertical-horizontal illusion. This illusion is typically created by having a vertical line rise from the center of a horizontal line of the same length creating an inverted T figure. We aimed to determine if the degree to which one fixates on a spatial location where the two lines bisect could influence the strength of the illusion, assuming that the framing effect would be stronger when the retinal image is more stable...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28388483/illusions-of-integration-are-subjectively-impenetrable-phenomenological-experience-of-lag-1-percepts-during-dual-target-rsvp
#17
Luca Simione, Elkan G Akyürek, Valentina Vastola, Antonino Raffone, Howard Bowman
We investigated the relationship between different kinds of target reports in a rapid serial visual presentation task, and their associated perceptual experience. Participants reported the identity of two targets embedded in a stream of stimuli and their associated subjective visibility. In our task, target stimuli could be combined together to form more complex ones, thus allowing participants to report temporally integrated percepts. We found that integrated percepts were associated with high subjective visibility scores, whereas reports in which the order of targets was reversed led to a poorer perceptual experience...
April 4, 2017: Consciousness and Cognition
https://www.readbyqxmd.com/read/28362898/dynamic-modulation-of-illusory-and-physical-target-size-on-separate-and-coordinated-eye-and-hand-movements
#18
Christine M Gamble, Joo-Hyun Song
In everyday behavior, two of the most common visually guided actions-eye and hand movements-can be performed independently, but are often synergistically coupled. In this study, we examine whether the same visual representation is used for different stages of saccades and pointing, namely movement preparation and execution, and whether this usage is consistent between independent and naturalistic coordinated eye and hand movements. To address these questions, we used the Ponzo illusion to dissociate the perceived and physical sizes of visual targets and measured the effects on movement preparation and execution for independent and coordinated saccades and pointing...
March 1, 2017: Journal of Vision
https://www.readbyqxmd.com/read/28356412/dynamic-masquerade-with-morphing-three-dimensional-skin-in-cuttlefish
#19
Deanna Panetta, Kendra Buresch, Roger T Hanlon
Masquerade is a defence tactic in which a prey resembles an inedible or inanimate object thus causing predators to misclassify it. Most masquerade colour patterns are static although some species adopt postures or behaviours to enhance the effect. Dynamic masquerade in which the colour pattern can be changed is rare. Here we report a two-step sensory process that enables an additional novel capability known only in cuttlefish and octopus: morphing three-dimensional physical skin texture that further enhances the optical illusions created by coloured skin patterns...
March 2017: Biology Letters
https://www.readbyqxmd.com/read/28352241/the-sense-of-1pp-location-contributes-to-shaping-the-perceived-self-location-together-with-the-sense-of-body-location
#20
Hsu-Chia Huang, Yen-Tung Lee, Wen-Yeo Chen, Caleb Liang
Self-location-the sense of where I am in space-provides an experiential anchor for one's interaction with the environment. In the studies of full-body illusions, many researchers have defined self-location solely in terms of body-location-the subjective feeling of where my body is. Although this view is useful, there is an issue regarding whether it can fully accommodate the role of 1PP-location-the sense of where my first-person perspective is located in space. In this study, we investigate self-location by comparing body-location and 1PP-location: using a head-mounted display (HMD) and a stereo camera, the subjects watched their own body standing in front of them and received tactile stimulations...
2017: Frontiers in Psychology
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