keyword
MENU ▼
Read by QxMD icon Read
search

visual illusion

keyword
https://www.readbyqxmd.com/read/28207734/a-causal-inference-model-explains-perception-of-the-mcgurk-effect-and-other-incongruent-audiovisual-speech
#1
John F Magnotti, Michael S Beauchamp
Audiovisual speech integration combines information from auditory speech (talker's voice) and visual speech (talker's mouth movements) to improve perceptual accuracy. However, if the auditory and visual speech emanate from different talkers, integration decreases accuracy. Therefore, a key step in audiovisual speech perception is deciding whether auditory and visual speech have the same source, a process known as causal inference. A well-known illusion, the McGurk Effect, consists of incongruent audiovisual syllables, such as auditory "ba" + visual "ga" (AbaVga), that are integrated to produce a fused percept ("da")...
February 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/28205639/biological-motion-distorts-size-perception
#2
Peter Veto, Wolfgang Einhäuser, Nikolaus F Troje
Visual illusions explore the limits of sensory processing and provide an ideal testbed to study perception. Size illusions - stimuli whose size is consistently misperceived - do not only result from sensory cues, but can also be induced by cognitive factors, such as social status. Here we investigate, whether the ecological relevance of biological motion can also distort perceived size. We asked observers to judge the size of point-light walkers (PLWs), configurations of dots whose movements induce the perception of human movement, and visually matched control stimuli (inverted PLWs)...
February 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28196765/visual-illusion-of-tool-use-recalibrates-tactile-perception
#3
Luke E Miller, Matthew R Longo, Ayse P Saygin
Brief use of a tool recalibrates multisensory representations of the user's body, a phenomenon called tool embodiment. Despite two decades of research, little is known about its boundary conditions. It has been widely argued that embodiment requires active tool use, suggesting a critical role for somatosensory and motor feedback. The present study used a visual illusion to cast doubt on this view. We used a mirror-based setup to induce a visual experience of tool use with an arm that was in fact stationary...
February 11, 2017: Cognition
https://www.readbyqxmd.com/read/28192010/the-relationship-between-flash-based-illusory-line-motion-and-exogenous-visual-attention
#4
HyunYoung Ha, Don Li, Bradley Patten, Jeff P Hamm
If a bar suddenly appears between 2 squares after 1 of the squares flashes the bar appears to shoot away from the flashed square toward the other. This occurs despite the bar actually having been presented all at once. This illusory motion is sufficiently strong to cancel real motion drawn in the opposite direction. One explanation for the illusion in these displays is based upon the prior entry benefits generated by exogenous attention at the flashed location. These prior entry benefits can be offset by real motion in the opposite direction, which enables 1 to quantify the illusion based upon the area between the response curves following left and right flashes...
February 13, 2017: Canadian Journal of Experimental Psychology, Revue Canadienne de Psychologie Expérimentale
https://www.readbyqxmd.com/read/28163675/visual-distractors-disrupt-audiovisual-integration-regardless-of-stimulus-complexity
#5
Kyla D Gibney, Enimielen Aligbe, Brady A Eggleston, Sarah R Nunes, Willa G Kerkhoff, Cassandra L Dean, Leslie D Kwakye
The intricate relationship between multisensory integration and attention has been extensively researched in the multisensory field; however, the necessity of attention for the binding of multisensory stimuli remains contested. In the current study, we investigated whether diverting attention from well-known multisensory tasks would disrupt integration and whether the complexity of the stimulus and task modulated this interaction. A secondary objective of this study was to investigate individual differences in the interaction of attention and multisensory integration...
2017: Frontiers in Integrative Neuroscience
https://www.readbyqxmd.com/read/28160054/a-simple-method-for-international-standardization-of-photographic-documentation-for-aesthetic-plastic-surgery
#6
Seung Chul Rhee
: Due to the lack of internationally standardized, objective, and scientific photographic standardization methods, differences in photographic documents have gravely affected the truth of surgical outcomes by visual misperception or illusion, thus hindering the development of plastic surgery clinically and scholastically. Here I suggest a simple method for standardization of facial photographs. The method consists of an imaginary transverse line (tentatively the "PSA line") rather than the Frankfort horizontal plane and uses a white background with black grids and standard RGB with CMYK circles...
February 3, 2017: Aesthetic Plastic Surgery
https://www.readbyqxmd.com/read/28141877/evolved-navigation-illusion-provides-universal-human-perception-measure
#7
Russell E Jackson, Jule Gómez de García
The ability to replicate an experiment across any scientific discipline rests on the assumption that different experimenters are capable of perceiving the same methods and outcomes. However, the large individual differences in experimenters' visual perception undermine this tenet of the scientific process. Further, common devices for measuring similarity in perceptual capacity do not replicate across human groups. Here, we used evolved navigation theory to predict a universal way to measure human perceptual capacity via a distance illusion...
January 1, 2017: Journal of Vision
https://www.readbyqxmd.com/read/28134631/changes-in-pupil-diameter-are-correlated-with-the-occurrence-of-pareidolias-in-patients-with-dementia-with-lewy-bodies
#8
Yumi Suzuki, Kazumi Hirayama, Tatsuo Shimomura, Makoto Uchiyama, Hiromi Fujii, Etsuro Mori, Yoshiyuki Nishio, Osamu Iizuka, Ryusuke Inoue, Mika Otsuki, Shinya Sakai
Pareidolias are visual illusions of meaningful objects, such as faces and animals, that arise from ambiguous forms embedded in visual scenes. Pareidolias and visual hallucinations have been suggested to have a common underlying neural mechanism in patients with dementia with Lewy bodies (DLB). The aim of the present study was to find an externally observable physiological indicator of pareidolias. Using a pareidolia test developed by Uchiyama and colleagues, we evoked pareidolias in patients with DLB and recorded the resultant changes in the diameters of their pupil...
January 27, 2017: Neuroreport
https://www.readbyqxmd.com/read/28125585/the-flash-lag-effect-as-a-motion-based-predictive-shift
#9
Mina A Khoei, Guillaume S Masson, Laurent U Perrinet
Due to its inherent neural delays, the visual system has an outdated access to sensory information about the current position of moving objects. In contrast, living organisms are remarkably able to track and intercept moving objects under a large range of challenging environmental conditions. Physiological, behavioral and psychophysical evidences strongly suggest that position coding is extrapolated using an explicit and reliable representation of object's motion but it is still unclear how these two representations interact...
January 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/28113856/piecestack-toward-better-understanding-of-stacked-graphs
#10
Tongshuang Wu, Yingcai Wu, Conglei Shi, Huamin Qu, Weiwei Cui
Stacked graphs have been widely adopted in various fields, because they are capable of hierarchically visualizing a set of temporal sequences as well as their aggregation. However, because of visual illusion issues, connections between overly-detailed individual layers and overly-generalized aggregation are intercepted. Consequently, information in this area has yet to be fully excavated. Thus, we present PieceStack in this paper, to reveal the relevance of stacked graphs in understanding intrinsic details of their displayed shapes...
February 24, 2016: IEEE Transactions on Visualization and Computer Graphics
https://www.readbyqxmd.com/read/28106066/the-psychosis-spectrum-in-parkinson-disease
#11
REVIEW
Dominic H Ffytche, Byron Creese, Marios Politis, K Ray Chaudhuri, Daniel Weintraub, Clive Ballard, Dag Aarsland
In 2007, the clinical and research profile of illusions, hallucinations, delusions and related symptoms in Parkinson disease (PD) was raised with the publication of a consensus definition of PD psychosis. Symptoms that were previously deemed benign and clinically insignificant were incorporated into a continuum of severity, leading to the rapid expansion of literature focusing on clinical aspects, mechanisms and treatment. Here, we review this literature and the evolving view of PD psychosis. Key topics include the prospective risk of dementia in individuals with PD psychosis, and the causal and modifying effects of PD medication...
February 2017: Nature Reviews. Neurology
https://www.readbyqxmd.com/read/28095201/multisensory-bayesian-inference-depends-on-synapse-maturation-during-training-theoretical-analysis-and-neural-modeling-implementation
#12
Mauro Ursino, Cristiano Cuppini, Elisa Magosso
Recent theoretical and experimental studies suggest that in multisensory conditions, the brain performs a near-optimal Bayesian estimate of external events, giving more weight to the more reliable stimuli. However, the neural mechanisms responsible for this behavior, and its progressive maturation in a multisensory environment, are still insufficiently understood. The aim of this letter is to analyze this problem with a neural network model of audiovisual integration, based on probabilistic population coding-the idea that a population of neurons can encode probability functions to perform Bayesian inference...
January 17, 2017: Neural Computation
https://www.readbyqxmd.com/read/28079118/thermal-grill-conditioning-effect-on-contact-heat-evoked-potentials
#13
Catherine R Jutzeler, Freda M Warner, Johann Wanek, Armin Curt, John L K Kramer
The 'thermal grill illusion' (TGI) is a unique cutaneous sensation of unpleasantness, induced through the application of interlacing warm and cool stimuli. While previous studies have investigated optimal parameters and subject characteristics to evoke the illusion, our aim was to examine the modulating effect as a conditioning stimulus. A total of 28 healthy control individuals underwent three testing sessions on separate days. Briefly, 15 contact heat stimuli were delivered to the right hand dorsum, while the left palmar side of the hand was being conditioned with either neutral (32 °C), cool (20 °C), warm (40 °C), or TGI (20/40 °C)...
January 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28078975/the-uniformity-illusion
#14
Marte Otten, Yair Pinto, Chris L E Paffen, Anil K Seth, Ryota Kanai
Vision in the fovea, the center of the visual field, is much more accurate and detailed than vision in the periphery. This is not in line with the rich phenomenology of peripheral vision. Here, we investigated a visual illusion that shows that detailed peripheral visual experience is partially based on a reconstruction of reality. Participants fixated on the center of a visual display in which central stimuli differed from peripheral stimuli. Over time, participants perceived that the peripheral stimuli changed to match the central stimuli, so that the display seemed uniform...
January 2017: Psychological Science
https://www.readbyqxmd.com/read/28077329/body-schema-plasticity-after-stroke-subjective-and-neurophysiological-correlates-of-the-rubber-hand-illusion
#15
Roberto Llorens, Adrián Borrego, Priscila Palomo, Ausiàs Cebolla, Enrique Noé, Sergi Bermúdez I Badia, Rosa Baños
Stroke can lead to motor impairments that can affect the body structure and restraint mobility. We hypothesize that brain lesions and their motor sequelae can distort the body schema, a sensorimotor map of body parts and elements in the peripersonal space through which human beings embody the reachable space and ready the body for forthcoming movements. Two main constructs have been identified in the embodiment mechanism: body-ownership, the sense that the body that one inhabits is his/her own, and agency, the sense that one can move and control his/her body...
February 2017: Neuropsychologia
https://www.readbyqxmd.com/read/28072708/life-threatening-motor-vehicle-crashes-in-bright-sunlight
#16
Donald A Redelmeier, Sheharyar Raza
: Bright sunlight may create visual illusions that lead to driver error, including fallible distance judgment from aerial perspective. We tested whether the risk of a life-threatening motor vehicle crash was increased when driving in bright sunlight.This longitudinal, case-only, paired-comparison analysis evaluated patients hospitalized because of a motor vehicle crash between January 1, 1995 and December 31, 2014. The relative risk of a crash associated with bright sunlight was estimated by evaluating the prevailing weather at the time and place of the crash compared with the weather at the same hour and location on control days a week earlier and a week later...
January 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28071707/the-content-of-imagined-sounds-changes-visual-motion-perception-in-the-cross-bounce-illusion
#17
Christopher C Berger, H Henrik Ehrsson
Can what we imagine hearing change what we see? Whether imagined sensory stimuli are integrated with external sensory stimuli to shape our perception of the world has only recently begun to come under scrutiny. Here, we made use of the cross-bounce illusion in which an auditory stimulus presented at the moment two passing objects meet promotes the perception that the objects bounce off rather than cross by one another to examine whether the content of imagined sound changes visual motion perception in a manner that is consistent with multisensory integration...
January 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28070622/haptic-feedback-attenuates-illusory-bias-in-pantomime-grasping-evidence-for-a-visuo-haptic-calibration
#18
Jillian Chan, Matthew Heath
Relative visual information has been shown to mediate grasping responses directed to an area previously occupied by a target object (i.e., pantomime-grasping) and is an information type functionally distinct from the absolute visual information supporting naturalistic grasping (i.e., grasping a physical target). Pantomime- and naturalistic grasps differ not only in terms of their visual properties, but also because the former lacks physical interaction with a target object (i.e., no-haptic feedback). The absence of haptic feedback may represent a reason why pantomime- and naturalistic grasps differ...
January 9, 2017: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/28068368/a-virtual-out-of-body-experience-reduces-fear-of-death
#19
Pierre Bourdin, Itxaso Barberia, Ramon Oliva, Mel Slater
Immersive virtual reality can be used to visually substitute a person's real body by a life-sized virtual body (VB) that is seen from first person perspective. Using real-time motion capture the VB can be programmed to move synchronously with the real body (visuomotor synchrony), and also virtual objects seen to strike the VB can be felt through corresponding vibrotactile stimulation on the actual body (visuotactile synchrony). This setup typically gives rise to a strong perceptual illusion of ownership over the VB...
2017: PloS One
https://www.readbyqxmd.com/read/28067329/perceptual-similarity-and-the-neural-correlates-of-geometrical-illusions-in-human-brain-structure
#20
Vadim Axelrod, D Samuel Schwarzkopf, Sharon Gilaie-Dotan, Geraint Rees
Geometrical visual illusions are an intriguing phenomenon, in which subjective perception consistently misjudges the objective, physical properties of the visual stimulus. Prominent theoretical proposals have been advanced attempting to find common mechanisms across illusions. But empirically testing the similarity between illusions has been notoriously difficult because illusions have very different visual appearances. Here we overcome this difficulty by capitalizing on the variability of the illusory magnitude across participants...
January 9, 2017: Scientific Reports
keyword
keyword
94391
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"