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https://www.readbyqxmd.com/read/28209526/robust-size-illusion-produced-by-expanding-and-contracting-flow-fields
#1
Xue Dong, Jianying Bai, Min Bao
A new illusion is described. Randomly positioned dots moved radially within an imaginary annular window. The dots' motion periodically changed the direction, leading to an alternating percept of expanding and contracting motion. Strikingly, the apparent size of the enclosed circular region shrank during the dots' expanding phases and dilated during the contracting phases. We quantitatively measured the illusion, and found that the presence of energy at the local kinetic edge could not account for the illusion...
February 13, 2017: Vision Research
https://www.readbyqxmd.com/read/28207734/a-causal-inference-model-explains-perception-of-the-mcgurk-effect-and-other-incongruent-audiovisual-speech
#2
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
#3
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/28203632/timing-disownership-experiences-in-the-rubber-hand-illusion
#4
Timothy Lane, Su-Ling Yeh, Philip Tseng, An-Yi Chang
Some investigators of the rubber hand illusion (RHI) have suggested that when standard RHI induction procedures are employed, if the rubber hand is experienced by participants as owned, their corresponding biological hands are experienced as disowned. Others have demurred: drawing upon a variety of experimental data and conceptual considerations, they infer that experience of the RHI might include the experience of a supernumerary limb, but that experienced disownership of biological hands does not occur. Indeed, some investigators even categorically deny that any experimental paradigm has been employed or any evidence can be adduced to support the claim that disownership experiences occur during the RHI...
2017: Cogn Res Princ Implic
https://www.readbyqxmd.com/read/28196765/visual-illusion-of-tool-use-recalibrates-tactile-perception
#5
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/28193093/the-self-is-an-illusion-a-conceptual-framework-for-psychotherapy
#6
Steve Stankevicius
OBJECTIVE: To explain the illusory nature of the self and explore its implications for psychotherapy. CONCLUSIONS: Our usual experience of the self is an illusion. Rather than a discrete entity, it is a network of processes that maintains apparent irreducible unity via alterations of perceptions, beliefs, intentions and memories. By providing an efficient summary of an individual and its surroundings, the self-illusion allows one to predict, experience and interact with the world efficiently...
February 1, 2017: Australasian Psychiatry: Bulletin of Royal Australian and New Zealand College of Psychiatrists
https://www.readbyqxmd.com/read/28192010/the-relationship-between-flash-based-illusory-line-motion-and-exogenous-visual-attention
#7
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/28186673/modulation-of-fronto-parietal-connections-during-the-rubber-hand-illusion
#8
Anke Ninija Karabanov, Anina Ritterband-Rosenbaum, Mark Schram Christensen, Hartwig Roman Siebner, Jens Bo Nielsen
Accumulating evidence suggests that parieto-frontal connections play a role in adjusting body ownership during the Rubber Hand Illusion (RHI). Using a motor version of the rubber hand illusion paradigm, we applied single-site and dual-site transcranial magnetic stimulation (TMS) to investigate cortico-spinal and parietal-frontal connectivity during perceived rubber hand ownership. Healthy volunteers received a conditioning TMS pulse over left anterior intraparietal sulcus (aIPS) and a test TMS pulse over left primary motor cortex (M1)...
February 10, 2017: European Journal of Neuroscience
https://www.readbyqxmd.com/read/28184316/perceptual-distortions-and-deceptions-what-computers-can-teach-us
#9
Matthew M Nour, Joseph M Nour
The nature of perception has fascinated philosophers for centuries, and has more recently been the focus of research in psychology and neuroscience. Many psychiatric disorders are characterised by perceptual abnormalities, ranging from sensory distortions to illusions and hallucinations. The distinction between normal and abnormal perception is, however, hard to articulate. In this article we argue that the distinction between normal perception and abnormal perception is best seen as a quantitative one, resting on the degree to which the observer's prior expectations influence perceptual inference...
February 2017: BJPsych Bulletin
https://www.readbyqxmd.com/read/28182487/exploring-whether-nonhuman-primates-show-a-bias-to-overestimate-dense-quantities
#10
Audrey E Parrish, Brielle T James, Michael J Beran
The density bias, documented within the foraging domain for some monkey species and for human infants, emerges when perceived numerosity is affected by interstimulus distance such that densely arranged food items appear more numerous relative to the same amount of food sparsely arranged. In this study, capuchin monkeys and rhesus monkeys were presented with a computerized relative discrimination task that allowed for the control of stimulus size, interelemental distance, and overall array pattern. The main objective was to determine whether the density bias was a more widespread and general perceptual phenomenon that extends beyond the foraging domain, similar to other numerosity illusions and biases...
February 2017: Journal of Comparative Psychology
https://www.readbyqxmd.com/read/28181254/where-s-your-head-at-an-illusion-of-head-orientation-which-reveals-dissociation-of-proprioceptive-signals-for-balance-versus-perception
#11
Raymond F Reynolds
No abstract text is available yet for this article.
February 8, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28167256/turning-the-tide-against-tuberculosis
#12
Nesri Padayatchi, Naressa Naidu, Gerald Friedland, Kasavan Naidoo, Francesca Conradie, Kogieleum Naidoo, Max Roe O'Donnell
Despite affecting men, women and children for millennia, tuberculosis (TB) is the most neglected disease. In contrast, the global response to HIV has reached a defining moment. By uniting efforts, promptly integrating major scientific findings for both treatment and prevention, and scaling up services, the once inconceivable end to the HIV epidemic may no longer be an illusion. "The world has made defeating AIDS a top priority. This is a blessing. But TB remains ignored" - Nelson Mandela. While there is no doubt that revolutionary diagnostics, and new and repurposed drugs have provided some hope in the fight against TB, it is evident that scientific advances on their own are inadequate to achieve the World Health Organisation's ambitious goal to end TB by 2035...
February 3, 2017: International Journal of Infectious Diseases: IJID
https://www.readbyqxmd.com/read/28163675/visual-distractors-disrupt-audiovisual-integration-regardless-of-stimulus-complexity
#13
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/28160509/examination-of-factors-affecting-the-intraoral-perception-of-object-size-a-preliminary-study
#14
Kaori Tomita, Kohji Murakami, Mari Takahashi, Takafumi Ooka, Shouji Hironaka
Oral sensory function is essential for the successful performance of a range of ingestion. Although the perception of object size is important in determining the degree of manipulation, evidence suggests that people does not always perceive the size of the object in oral cavity accurately. The purpose of this study is to investigate the factors affecting the intraoral perception of object size. 23 healthy young volunteers detected the size of cylinders inserted into oral cavity blindly and identified it from the reference set...
February 4, 2017: Journal of Oral Rehabilitation
https://www.readbyqxmd.com/read/28160054/a-simple-method-for-international-standardization-of-photographic-documentation-for-aesthetic-plastic-surgery
#15
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/28153687/error-related-negativity-in-the-skilled-brain-of-pianists-reveals-motor-simulation
#16
Alice Mado Proverbio, Matteo Cozzi, Andrea Orlandi, Manuel Carminati
Evidences have been provided of a crucial role of multimodal audio-visuomotor processing in subserving the musical ability. In this paper we investigated whether musical audiovisual stimulation might trigger the activation of motor information in the brain of professional pianists, due to the presence of permanent gestures/sound associations. At this aim EEG was recorded in 24 pianists and naive participants engaged in the detection of rare targets while watching hundreds of video clips showing a pair of hands in the act of playing, along with a compatible or incompatible piano soundtrack...
January 30, 2017: Neuroscience
https://www.readbyqxmd.com/read/28153639/parkinson-s-disease-alters-multisensory-perception-insights-from-the-rubber-hand-illusion
#17
Catherine Ding, Colin J Palmer, Jakob Hohwy, George J Youssef, Bryan Paton, Naotsugu Tsuchiya, Julie C Stout, Dominic Thyagarajan
BACKGROUND: Manipulation of multisensory integration induces illusory perceptions of body ownership. Patients with Parkinson's disease (PD), a neurodegenerative disorder characterised by striatal dopamine deficiency, are prone to illusions and hallucinations and have sensory deficits. Dopaminergic treatment also aggravates hallucinations in PD. Whether multisensory integration in body ownership is altered by PD is unexplored. OBJECTIVE: To study the effect of dopamine neurotransmission on illusory perceptions of body ownership...
January 31, 2017: Neuropsychologia
https://www.readbyqxmd.com/read/28148834/unravelling-the-illusion-of-flicker-fusion
#18
REVIEW
Diana Umeton, Jenny C A Read, Candy Rowe
For over 150 years, researchers have investigated the anti-predator function of animal patterns. However, this work has mainly focused on when prey remain still, and has only recently started to incorporate motion into the study of defensive coloration. As motion breaks camouflage, a new challenge is to understand how prey avoid predators while moving around their environment, and if a moving prey can ever be camouflaged. We propose that there is a solution to this, in that a 'flicker fusion effect' can change the appearance of the prey in the eyes of their predators to reduce the chances of initial detection...
February 2017: Biology Letters
https://www.readbyqxmd.com/read/28141877/evolved-navigation-illusion-provides-universal-human-perception-measure
#19
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/28141523/the-plausibility-of-a-string-quartet-performance-in-virtual-reality
#20
Ilias Bergstrom, Sergio Azevedo, Panos Papiotis, Nuno Saldanha, Mel Slater
We describe an experiment that explores the contribution of auditory and other features to the illusion of plausibility in a virtual environment that depicts the performance of a string quartet. 'Plausibility' refers to the component of presence that is the illusion that the perceived events in the virtual environment are really happening. The features studied were: Gaze (the musicians ignored the participant, the musicians sometimes looked towards and followed the participant's movements), Sound Spatialization (Mono, Stereo, Spatial), Auralization (no sound reflections, reflections corresponding to a room larger than the one perceived, reflections that exactly matched the virtual room), and Environment (no sound from outside of the room, birdsong and wind corresponding to the outside scene)...
January 27, 2017: IEEE Transactions on Visualization and Computer Graphics
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