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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/28344566/the-onset-time-of-the-ownership-sensation-in-the-moving-rubber-hand-illusion
#3
Andreas Kalckert, H H Ehrsson
The rubber hand illusion (RHI) is a perceptual illusion whereby a model hand is perceived as part of one's own body. This illusion has been extensively studied, but little is known about the temporal evolution of this perceptual phenomenon, i.e., how long it takes until participants start to experience ownership over the model hand. In the present study, we investigated a version of the rubber hand experiment based on finger movements and measured the average onset time in active and passive movement conditions...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28324985/a-novel-thermal-tactile-stimulator-device-for-quantitative-sensory-testing
#4
Umit Kursun, Olcay Kursun, Oleg V Favorov
This paper outlines the design and preliminary experimental results of a novel thermal stimulator device designed to measure, from some perspectives, brain health. The device delivers some thermal stimuli and asks the subject about his perception about them, thus checking the correctness of the perception and even the existence of certain perceptual illusions that would normally be present in healthy cortex and nervous system. This noninvasive sensory technology is cheap and easy to use, it has the potential to be used in telemonitoring systems and in empowering the individual to track his/her progression over time on the provided neuropathy tests...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28320677/intermanual-apparent-tactile-motion-and-its-extension-to-3d-interactions
#5
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/28319685/linking-actions-and-objects-context-specific-learning-of-novel-weight-priors
#6
Kevin M Trewartha, J Randall Flanagan
Distinct explicit and implicit memory processes support weight predictions used when lifting objects and making perceptual judgments about weight, respectively. The first time that an object is encountered weight is predicted on the basis of learned associations, or priors, linking size and material to weight. A fundamental question is whether the brain maintains a single, global representation of priors, or multiple representations that can be updated in a context specific way. A second key question is whether the updating of priors, or the ability to scale lifting forces when repeatedly lifting unusually weighted objects requires focused attention...
March 17, 2017: Cognition
https://www.readbyqxmd.com/read/28290533/bidirectional-shifting-effects-of-the-sound-intensity-on-the-best-frequency-in-the-rat-auditory-cortex
#7
Can Tao, Guangwei Zhang, Chang Zhou, Lijuan Wang, Sumei Yan, Yi Zhou, Ying Xiong
Frequency and intensity are two independent attributes of sound stimuli. Psychoacoustic studies have found that the sound intensity can affect the perception of frequency; however, the underlying neuronal mechanism remains largely unknown. To investigate if and how the sound level affects the frequency coding for auditory cortical neurons, we recorded the activities of neuronal ensembles and single neurons, as well as the synaptic input evoked by pure tones of different frequency and intensity combinations, in layer 4 of the rat primary auditory cortex...
March 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28288382/the-informative-value-of-type-of-repetition-perceptual-and-conceptual-fluency-influences-on-judgments-of-truth
#8
Rita R Silva, Teresa Garcia-Marques, Rolf Reber
We contrast the effects of conceptual and perceptual fluency resulting from repetition in the truth effect. In Experiment 1, participants judged either verbatim or paraphrased repetitions, which reduce perceptual similarity to original statements. Judgments were made either immediately after the first exposure to the statements or after one week. Illusions of truth emerged for both types of repetition, with delay reducing both effects. In Experiment 2, participants judged verbatim and paraphrased repetitions with either the same or a contradictory meaning of original statements...
March 10, 2017: Consciousness and Cognition
https://www.readbyqxmd.com/read/28245493/different-spatial-representations-guide-eye-and-hand-movements
#9
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/28228928/rotating-snakes-illusion-quantitative-analysis-reveals-a-region-in-luminance-space-with-opposite-illusory-rotation
#10
Lea Atala-Gérard, Michael Bach
The Rotating Snakes Illusion employs patterns with repetitive asymmetric luminance steps forming a "snake wheel." In the underlying luminance sequence {black, dark grey, white, light grey}, coded as {0, g1, 100, g2}, we varied g1 and g2 and measured illusion strength via nulling: Saccades were performed next to a "snake wheel" that rotated physically; observers adjusted rotation until a stationary percept obtained. Observers performed the perceptual nulling of the seeming rotation reliably. Typical settings for (g1, g2), measured from images by Kitaoka, are around (20%, 60%)...
January 2017: I-Perception
https://www.readbyqxmd.com/read/28217087/editorial-the-future-of-perceptual-illusions-from-phenomenology-to-neuroscience
#11
EDITORIAL
Adam Reeves, Baingio Pinna
No abstract text is available yet for this article.
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28207734/a-causal-inference-model-explains-perception-of-the-mcgurk-effect-and-other-incongruent-audiovisual-speech
#12
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/28184316/perceptual-distortions-and-deceptions-what-computers-can-teach-us
#13
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
#14
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/28163675/visual-distractors-disrupt-audiovisual-integration-regardless-of-stimulus-complexity
#15
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/28141877/evolved-navigation-illusion-provides-universal-human-perception-measure
#16
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/28129172/mr360-mixed-reality-rendering-for-360-%C3%A2-panoramic-videos
#17
Taehyun Rhee, Lohit Petikam, Benjamin Allen, Andrew Chalmers
This paper presents a novel immersive system called MR360 that provides interactive mixed reality (MR) experiences using a conventional low dynamic range (LDR) 360 (°) panoramic video (360-video) shown in head mounted displays (HMDs). MR360 seamlessly composites 3D virtual objects into a live 360-video using the input panoramic video as the lighting source to illuminate the virtual objects. Image based lighting (IBL) is perceptually optimized to provide fast and believable results using the LDR 360-video as the lighting source...
January 23, 2017: IEEE Transactions on Visualization and Computer Graphics
https://www.readbyqxmd.com/read/28113602/vibrotactile-compliance-feedback-for-tangential-force-interaction
#18
Seongkook Heo, Geehyuk Lee
This paper presents a method to generate a haptic illusion of compliance using a vibrotactile actuator when a tangential force is applied to a rigid surface. The novel method builds on a conceptual compliance model where a physical object moves on a textured surface in response to a tangential force. The method plays vibration patterns simulating friction-induced vibrations as an applied tangential force changes. We built a prototype consisting of a two-dimensional tangential force sensor and a surface transducer to test the effectiveness of the model...
August 30, 2016: IEEE Transactions on Haptics
https://www.readbyqxmd.com/read/28106139/spatio-temporal-tolerance-of-visuo-tactile-illusions-in-artificial-skin-by-recurrent-neural-network-with-spike-timing-dependent-plasticity
#19
Alexandre Pitti, Ganna Pugach, Philippe Gaussier, Sotaro Shimada
Perceptual illusions across multiple modalities, such as the rubber-hand illusion, show how dynamic the brain is at adapting its body image and at determining what is part of it (the self) and what is not (others). Several research studies showed that redundancy and contingency among sensory signals are essential for perception of the illusion and that a lag of 200-300 ms is the critical limit of the brain to represent one's own body. In an experimental setup with an artificial skin, we replicate the visuo-tactile illusion within artificial neural networks...
January 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28106066/the-psychosis-spectrum-in-parkinson-disease
#20
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
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