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https://www.readbyqxmd.com/read/28345944/enhanced-integration-of-multisensory-body-information-by-proximity-to-habitual-action-space
#1
Harriet Dempsey-Jones, Ada Kritikos
Previous research suggests integration of visual and somatosensory inputs is enhanced within reaching (peripersonal) space. In such experiments, somatosensory inputs are presented on the body while visual inputs are moved relatively closer to, or further from the body. It is unclear, therefore, whether enhanced integration in "peripersonal space" is truly due to proximity of visual inputs to the body space, or, simply the distance between the inputs (which also affects integration). Using a modified induction of the rubber hand illusion, here we measured proprioceptive drift as an index of visuosomatosensory integration when distance between the two inputs was constrained, and absolute distance from the body was varied...
April 2017: Journal of Experimental Psychology. Human Perception and Performance
https://www.readbyqxmd.com/read/28344759/susceptibility-to-ebbinghaus-and-m%C3%A3-ller-lyer-illusions-in-autistic-children-a-comparison-of-three-different-methods
#2
Catherine Manning, Michael J Morgan, Craig T W Allen, Elizabeth Pellicano
BACKGROUND: Studies reporting altered susceptibility to visual illusions in autistic individuals compared to that typically developing individuals have been taken to reflect differences in perception (e.g. reduced global processing), but could instead reflect differences in higher-level decision-making strategies. METHODS: We measured susceptibility to two contextual illusions (Ebbinghaus, Müller-Lyer) in autistic children aged 6-14 years and typically developing children matched in age and non-verbal ability using three methods...
2017: Molecular Autism
https://www.readbyqxmd.com/read/28341161/predictive-position-computations-mediated-by-parietal-areas-tms-evidence
#3
Grace Edwards, Céline Paeye, Philippe Marque, Rufin VanRullen, Patrick Cavanagh
When objects move or the eyes move, the visual system can predict the consequence and generate a percept of the target at its new position. This predictive localization may depend on eye movement control in the frontal eye fields (FEF) and the intraparietal sulcus (IPS) and on motion analysis in the medial temporal area (MT). Across two experiments we examined whether repetitive transcranial magnetic stimulation (rTMS) over right FEF, right IPS, right MT, and a control site, peripheral V1/V2, diminished participants' perception of two cases of predictive position perception: trans-saccadic fusion, and the flash grab illusion, both presented in the contralateral visual field...
March 21, 2017: NeuroImage
https://www.readbyqxmd.com/read/28334126/heartfelt-self-cardio-visual-integration-affects-self-face-recognition-and-interoceptive-cortical-processing
#4
Alejandra Sel, Ruben T Azevedo, Manos Tsakiris
The sense of body-ownership relies on the representation of both interoceptive and exteroceptive signals coming from one's body. However, it remains unknown how the integration of bodily signals coming from "outside" and "inside" the body is instantiated in the brain. Here, we used a modified version of the Enfacement Illusion to investigate whether the integration of visual and cardiac information can alter self-face recognition (Experiment 1) and neural responses to heartbeats (Experiment 2). We projected a pulsing shade, that was synchronous or asynchronous with the participant's heartbeat, onto a picture depicting the participant's face morphed with the face of an unfamiliar other...
October 5, 2016: Cerebral Cortex
https://www.readbyqxmd.com/read/28325532/effectiveness-of-binaural-beats-in-reducing-preoperative-dental-anxiety
#5
B K Isik, A Esen, B Büyükerkmen, A Kilinç, D Menziletoglu
Binaural beats are an auditory illusion perceived when two different pure-tone sine waves are presented one to each ear at a steady intensity and frequency. We evaluated their effectiveness in reducing preoperative anxiety in dentistry. Sixty patients (30 in each group) who were to have impacted third molars removed were studied (experimental group: 20 women and 10 men, mean (range) age 24 (18-35) years, and control group: 22 women and 8 men, mean (range) age 28 (15-47) years). All patients were fully informed about the operation preoperatively, and their anxiety recorded on a visual analogue scale (VAS)...
March 18, 2017: British Journal of Oral & Maxillofacial Surgery
https://www.readbyqxmd.com/read/28322427/the-neuronal-correlates-of-mirror-illusion-in-children-with-spastic-hemiparesis-a-study-with-functional-magnetic-resonance-imaging
#6
Christian Weisstanner, Stefanie Saxer, Roland Wiest, Alain Kaelin-Lang, Christopher J Newman, Maja Steinlin, Sebastian Grunt
AIM: To investigate the neuronal activation pattern underlying the effects of mirror illusion in children/adolescents with normal motor development and in children/adolescents with hemiparesis and preserved contralateral corticospinal organisation. METHOD: The type of cortical reorganisation was classified according to results of transcranial magnetic stimulation. Only subjects with congenital lesions and physiological contralateral cortical reorganisation were included...
March 21, 2017: Swiss Medical Weekly
https://www.readbyqxmd.com/read/28320677/intermanual-apparent-tactile-motion-and-its-extension-to-3d-interactions
#7
Siyan Zhao, Ali Israr, Micah Fenner, Roberta Klatzky
Information provided by sensory systems is inherently ambiguous as to its source in the physical world. To arrive at a coherent representation, perception deploys heuristic rules and multimodal input, which potentially produce errors such as illusions. The current work uses these effects to create apparent tactile motion and illusory depth motion using sparse vibrotactile stimulation across the hands. Experiment 1 showed the effects of vibrotactile duration and temporal separation between the hands on the quality of perceived illusory linear motion...
March 13, 2017: IEEE Transactions on Haptics
https://www.readbyqxmd.com/read/28315846/risk-factors-for-early-psychosis-in-pd-insights-from-the-parkinson-s-progression-markers-initiative
#8
Dominic H Ffytche, Joana B Pereira, Clive Ballard, K Ray Chaudhuri, Daniel Weintraub, Dag Aarsland
BACKGROUND: Parkinson's Disease (PD) psychosis refers to the spectrum of illusions, formed hallucinations and delusions that occur in PD. Visual hallucinations and illusions are thought to be caused by specific cognitive and higher visual function deficits and patients who develop such symptoms early in the disease course have greater rates of cognitive decline and progression to dementia. To date, no studies have investigated whether such deficits are found prior to the onset of PD psychosis...
April 2017: Journal of Neurology, Neurosurgery, and Psychiatry
https://www.readbyqxmd.com/read/28299409/nothing-magical-pantomimed-grasping-is-controlled-by-the-ventral-system
#9
Thijs Rinsma, John van der Kamp, Matt Dicks, Rouwen Cañal-Bruland
In a recent amendment to the two-visual-system model, it has been proposed that actions must result in tactile contact with the goal object for the dorsal system to become engaged (Whitwell et al., Neuropsychologia 55:41-50, 2014). The present study tested this addition by assessing the use of allocentric information in normal and pantomime actions. To this end, magicians, and participants who were inexperienced in performing pantomime actions made normal and pantomime grasps toward objects embedded in the Müller-Lyer illusion...
March 15, 2017: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/28280568/how-do-great-bowerbirds-construct-perspective-illusions
#10
Laura A Kelley, John A Endler
Many animals build structures to provide shelter, avoid predation, attract mates or house offspring, but the behaviour and potential cognitive processes involved during building are poorly understood. Great bowerbird (Ptilinorhynchus nuchalis) males build and maintain display courts by placing tens to hundreds of objects in a positive size-distance gradient. The visual angles created by the gradient create a forced perspective illusion that females can use to choose a mate. Although the quality of illusion is consistent within males, it varies among males, which may reflect differences in how individuals reconstruct their courts...
January 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/28278312/spatial-filtering-color-constancy-and-the-color-changing-dress
#11
Erica L Dixon, Arthur G Shapiro
The color-changing dress is a 2015 Internet phenomenon in which the colors in a picture of a dress are reported as blue-black by some observers and white-gold by others. The standard explanation is that observers make different inferences about the lighting (is the dress in shadow or bright yellow light?); based on these inferences, observers make a best guess about the reflectance of the dress. The assumption underlying this explanation is that reflectance is the key to color constancy because reflectance alone remains invariant under changes in lighting conditions...
March 1, 2017: Journal of Vision
https://www.readbyqxmd.com/read/28275144/diverted-by-dazzle-perceived-movement-direction-is-biased-by-target-pattern-orientation
#12
Anna E Hughes, Christian Jones, Kaustuv Joshi, David J Tolhurst
'Motion dazzle' is the hypothesis that predators may misjudge the speed or direction of moving prey which have high-contrast patterning, such as stripes. However, there is currently little experimental evidence that such patterns cause visual illusions. Here, observers binocularly tracked a Gabor target, moving with a linear trajectory randomly chosen within 18° of the horizontal. This target then became occluded, and observers were asked to judge where they thought it would later cross a vertical line to the side...
March 15, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28264099/temporal-binding-window-of-the-sound-induced-flash-illusion-in-amblyopia
#13
Cindy Narinesingh, Herbert C Goltz, Agnes M F Wong
Purpose: Amblyopia is a neurodevelopmental visual disorder caused by abnormal visual experience in childhood. In addition to known visual deficits, there is evidence for changes in audiovisual integration in amblyopia using explicit tasks. We examined audiovisual integration in amblyopia using an implicit task that is more relevant in a real-world context. Methods: A total of 11 participants with amblyopia and 16 controls were tested binocularly and monocularly on the sound-induced flash illusion, in which flashes and beeps are presented concurrently and the perceived number of flashes is influenced by the number of beeps...
March 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28263626/predisposition-to-out-of-body-experience-obe-is-associated-with-aberrations-in-multisensory-integration-psychophysiological-support-from-a-rubber-hand-illusion-study
#14
Jason J Braithwaite, Derrick G Watson, Hayley Dewe
It has been argued that disorders in body-ownership and aberrant experiences in self-consciousness are due to biases in multisensory integration. Here we examine whether such biases are also associated with spontaneous out-of-body experiences (OBEs) in a nonclinical population. One-hundred and 80 participants took part in a rubber hand illusion (RHI) experiment with synchronous and asynchronous visual and tactile stimulation. A realistic threat was delivered to the rubber hand after a fixed period of stimulation...
March 6, 2017: Journal of Experimental Psychology. Human Perception and Performance
https://www.readbyqxmd.com/read/28253091/enlarged-temporal-integration-window-in-schizophrenia-indicated-by-the-double-flash-illusion
#15
Katharina Haß, Christopher Sinke, Tanya Reese, Mandy Roy, Daniel Wiswede, Wolfgang Dillo, Bob Oranje, Gregor R Szycik
INTRODUCTION: In the present study we were interested in the processing of audio-visual integration in schizophrenia compared to healthy controls. The amount of sound-induced double-flash illusions served as an indicator of audio-visual integration. We expected an altered integration as well as a different window of temporal integration for patients. METHODS: Fifteen schizophrenia patients and 15 healthy volunteers matched for age and gender were included in this study...
March 2017: Cognitive Neuropsychiatry
https://www.readbyqxmd.com/read/28245493/different-spatial-representations-guide-eye-and-hand-movements
#16
Matteo Lisi, Patrick Cavanagh
Our visual system allows us to localize objects in the world and plan motor actions toward them. We have recently shown that the localization of moving objects differs between perception and saccadic eye movements (Lisi & Cavanagh, 2015), suggesting different localization mechanisms for perception and action. This finding, however, could reflect a unique feature of the saccade system rather than a general dissociation between perception and action. To disentangle these hypotheses, we compared object localization between saccades and hand movements...
February 1, 2017: Journal of Vision
https://www.readbyqxmd.com/read/28243537/using-visuo-kinetic-virtual-reality-to-induce-illusory-spinal-movement-the-moovi-illusion
#17
Daniel S Harvie, Ross T Smith, Estin V Hunter, Miles G Davis, Michele Sterling, G Lorimer Moseley
BACKGROUND: Illusions that alter perception of the body provide novel opportunities to target brain-based contributions to problems such as persistent pain. One example of this, mirror therapy, uses vision to augment perceived movement of a painful limb to treat pain. Since mirrors can't be used to induce augmented neck or other spinal movement, we aimed to test whether such an illusion could be achieved using virtual reality, in advance of testing its potential therapeutic benefit. We hypothesised that perceived head rotation would depend on visually suggested movement...
2017: PeerJ
https://www.readbyqxmd.com/read/28238849/self-face-recognition-shares-brain-regions-active-during-proprioceptive-illusion-in-the-right-inferior-fronto-parietal-superior-longitudinal-fasciculus-iii-network
#18
Tomoyo Morita, Daisuke N Saito, Midori Ban, Koji Shimada, Yuko Okamoto, Hirotaka Kosaka, Hidehiko Okazawa, Minoru Asada, Eiichi Naito
Proprioception is somatic sensation that allows us to sense and recognize position, posture, and their changes in our body parts. It pertains directly to oneself and may contribute to bodily awareness. Likewise, one's face is a symbol of oneself, so that visual self-face recognition directly contributes to the awareness of self as distinct from others. Recently, we showed that right-hemispheric dominant activity in the inferior fronto-parietal cortices, which are connected by the inferior branch of the superior longitudinal fasciculus (SLF III), is associated with proprioceptive illusion (awareness), in concert with sensorimotor activity...
February 24, 2017: Neuroscience
https://www.readbyqxmd.com/read/28207734/a-causal-inference-model-explains-perception-of-the-mcgurk-effect-and-other-incongruent-audiovisual-speech
#19
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
#20
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
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