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https://www.readbyqxmd.com/read/28821653/human-occipital-and-parietal-gaba-selectively-influence-visual-perception-of-orientation-and-size
#1
Chen Song, Kristian Sandberg, Lau Møller Andersen, Jakob Udby Blicher, Geraint Rees
Gamma-aminobutyric acid (GABA) is the primary inhibitory neurotransmitter in human brain. GABA level varies substantially across individuals and this variability is associated with inter-individual differences in visual perception. However, it remains unclear whether the association between GABA level and visual perception reflects a general influence of visual inhibition, or whether GABA level of different cortical regions selectively influences perception of different visual features. To address this, we studied how GABA level in parietal and occipital cortices related to inter-individual differences in size, orientation, and brightness perception, in a group of healthy young male participants...
August 14, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28815431/central-peripheral-differences-in-audiovisual-and-visuotactile-event-perception
#2
Yi-Chuan Chen, Daphne Maurer, Terri L Lewis, Charles Spence, David I Shore
We examined audiovisual and visuotactile integration in the central and peripheral visual field using visual fission and fusion illusions induced by sounds or taps. The fission illusion occurs when a single flash is perceived as two flashes if paired with two beeps or taps; the fusion illusion, by contrast, occurs when two flashes are perceived as a single flash if the flashes are paired with a single beep or tap. Beeps and taps induced similar patterns of illusions: the fission illusion was larger in the periphery than in the center, whereas the fusion illusion was larger in the center than in the periphery...
August 16, 2017: Attention, Perception & Psychophysics
https://www.readbyqxmd.com/read/28814175/exploring-the-effects-of-visual-frame-and-matching-direction-on-the-vertical-horizontal-illusion
#3
José M Gavilán, Daniel Rivera, Marc Guasch, Josep Demestre, José E García-Albea
The work presented here uses an adjustment method to test the vertical-horizontal illusion across four different configurations: a cross-shape, an L-shape, an inverted-T and a rotated-T. We examine the modulatory role of the variables visual frame and direction of the adjustment on the illusory effect. Two experiments were performed, one with rectangular and one with curvilinear visual frames. Our data show that in both experiments, the size of the expected illusion increases from the cross-shape to the L-shape and from the L-shape to the inverted-T, where it reaches its maximum...
January 1, 2017: Perception
https://www.readbyqxmd.com/read/28809705/effects-of-continuous-kinaesthetic-feedback-based-on-tendon-vibration-on-motor-imagery-bci-performance
#4
M Barsotti, D Leonardis, N Vanello, M Bergamasco, A Frisoli
BACKGROUND AND OBJECTIVES: Feedback plays a crucial role for using Brain Computer Interface (BCI) systems. This study proposes the use of vibration-evoked kinaesthetic illusions as part of a novel multisensory feedback for a Motor Imagery (MI) based BCI and investigates its contributions in terms of BCI performance and electroencephalographic (EEG) correlates. METHODS: Sixteen subjects performed two different right arm MI-BCI sessions: with the visual feedback only and with both visual and vibration-evoked kinaesthetic feedback, conveyed by the stimulation of the biceps brachi tendon...
August 14, 2017: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/28803877/face-pareidolia-in-the-rhesus-monkey
#5
Jessica Taubert, Susan G Wardle, Molly Flessert, David A Leopold, Leslie G Ungerleider
Face perception in humans and nonhuman primates is rapid and accurate [1-4]. In the human brain, a network of visual-processing regions is specialized for faces [5-7]. Although face processing is a priority of the primate visual system, face detection is not infallible. Face pareidolia is the compelling illusion of perceiving facial features on inanimate objects, such as the illusory face on the surface of the moon. Although face pareidolia is commonly experienced by humans, its presence in other species is unknown...
August 4, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28802934/psychosis-in-parkinson-s-disease
#6
Dominic H Ffytche, Dag Aarsland
Although illusions, hallucinations and delusions did not play a prominent role in James Parkinson's original clinical descriptions, the longitudinal view of disease progression he advocated has important lessons for the study of such symptoms today. A focus on longitudinal progression rather than individual symptoms led to the concept of PD psychosis-a spectrum of positive symptoms in Parkinson's disease. The publication of criteria for PD psychosis in 2007 helped unify the disparate set of symptoms, raising their profile and resulting in a rapid expansion of literature focussing on clinical aspects, mechanisms, and treatment...
2017: International Review of Neurobiology
https://www.readbyqxmd.com/read/28769830/spatial-alignment-and-response-hand-in-geometric-and-motion-illusions
#7
Lisa Scocchia, Michela Paroli, Natale A Stucchi, Anna Sedda
Perception of visual illusions is susceptible to manipulation of their spatial properties. Further, illusions can sometimes affect visually guided actions, especially the movement planning phase. Remarkably, visual properties of objects related to actions, such as affordances, can prime more accurate perceptual judgements. In spite of the amount of knowledge available on affordances and on the influence of illusions on actions (or lack of thereof), virtually nothing is known about the reverse: the influence of action-related parameters on the perception of visual illusions...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28758271/visually-stressful-striped-patterns-alter-human-visual-cortical-functional-connectivity
#8
Jie Huang, David C Zhu
Visually stressful striped patterns with a spatial frequency (SF) of around 3 cycles per degree (cpd) can induce perceptual illusions/distortions and visual discomfort in most people, headaches in patients with migraine, and seizures in patients with photosensitive epilepsy. Patterns with SF ∼0.3 cpd have no such effects and are not uncomfortable to look at (non-stressful). The effects of the striped patterns on visual cortical activation have been investigated, but their effects on the visual cortical network remain to be studied...
July 31, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28740471/no-evidence-of-narrowly-defined-cognitive-penetrability-in-unambiguous-vision
#9
Nikki A Lammers, Edward H de Haan, Yair Pinto
The classical notion of cognitive impenetrability suggests that perceptual processing is an automatic modular system and not under conscious control. Near consensus is now emerging that this classical notion is untenable. However, as recently pointed out by Firestone and Scholl, this consensus is built on quicksand. In most studies claiming perception is cognitively penetrable, it remains unclear which actual process has been affected (perception, memory, imagery, input selection or judgment). In fact, the only available "proofs" for cognitive penetrability are proxies for perception, such as behavioral responses and neural correlates...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28735797/characteristics-correlates-and-assessment-of-psychosis-in-parkinson-disease-without-dementia
#10
Matthew J Barrett, Mark E Smolkin, Joseph L Flanigan, Binit B Shah, Madaline B Harrison, Scott A Sperling
INTRODUCTION: Considering that psychosis in Parkinson disease (PD) is associated with worse outcomes, including dementia, we aimed to study the characteristics, correlates, and assessment of PD psychosis in those without dementia. METHODS: 101 PD subjects without dementia (Montreal Cognitive Assessment ≥21/30) were recruited to participate in a study of neuropsychiatric symptoms in PD. This study included a baseline standard neurological exam and common PD symptom assessments...
July 15, 2017: Parkinsonism & related Disorders
https://www.readbyqxmd.com/read/28729913/personality-traits-and-perception-of-m%C3%A3-ller-lyer-illusion-in-male-chinese-military-soldiers-and-university-students
#11
Yingchun Zhang, Jing Liu, Yongli Wang, Jingyi Huang, Lili Wei, Bingren Zhang, Wei Wang, Wei Chen
BACKGROUND: In military men, performance such as gun-shooting precision relies on factors such as the ability to resist visual illusion, and this misperception of visual stimulus might be linked with sensation seeking related personality. METHODS: We have invited 103 male military men and 104 age-matched university male students to undergo the experiment of the Brentano version of the Müller-Lyer illusion and the Zuckerman-Kuhlman Personality Questionnaire (ZKPQ) tests...
2017: Translational Neuroscience
https://www.readbyqxmd.com/read/28721518/illusory-visual-depth-reversal-can-modulate-sensations-of-contact-surface
#12
Yuka Igarashi, Keiko Omori, Tetsuya Arai, Yasunori Aizawa
To perceive the external world stably, humans must integrate and manage continuous streams of information from various sensory modalities, in addition to drawing on past experiences and knowledge. In this study, we introduce a novel visuo-tactile illusion elicited by a visual-depth-reversal stimulus. The stimulus (a model of a building) was constructed so as to produce the same retinal image as an opaque cuboid, although it actually consisted of only three PVC boards forming a three-dimensional corner with the hollow inside facing the observer...
July 18, 2017: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/28713326/the-glare-effect-test-and-the-impact-of-age-on-luminosity-thresholds
#13
Alessio Facchin, Roberta Daini, Daniele Zavagno
The glare effect (GE) is an illusion in which a white region appears self-luminous when surrounded by linearly decreasing luminance ramps. It has been shown that the magnitude of the luminosity effect can be modulated by manipulating the luminance range of the gradients. In the present study we tested the thresholds for the GE on two groups of adults: young (20-30 years old) and elderly (60-75 years old). Purpose of our perspective study was to test the possibility of transforming the GE into a test that could easily measure thresholds for luminosity and discomfort glare...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28712674/the-ebbinghaus-illusion-in-the-gray-bamboo-shark-chiloscyllium-griseum-in-comparison-to-the-teleost-damselfish-chromis-chromis
#14
Theodora Fuss, Vera Schluessel
This is the first study to comparatively assess the perception of the Ebbinghaus-Titchener circles and variations of the Delboeuf illusion in four juvenile bamboo sharks (Chiloscyllium griseum) and five damselfish (Chromis chromis) using identical training paradigms. We aimed to investigate whether these two species show similarities in the perceptual integration of local elements into the global context. The Ebbinghaus-Titchener circles consist of two equally sized central test circles surrounded by smaller or larger circles of different size, number and/or distance...
May 29, 2017: Zoology: Analysis of Complex Systems, ZACS
https://www.readbyqxmd.com/read/28709045/enhancing-performance-expectancies-through-visual-illusions-facilitates-motor-learning-in-children
#15
Moslem Bahmani, Gabriele Wulf, Farhad Ghadiri, Saeed Karimi, Rebecca Lewthwaite
In a recent study by Chauvel, Wulf, and Maquestiaux (2015), golf putting performance was found to be affected by the Ebbinghaus illusion. Specifically, adult participants demonstrated more effective learning when they practiced with a hole that was surrounded by small circles, making it look larger, than when the hole was surrounded by large circles, making it look smaller. The present study examined whether this learning advantage would generalize to children who are assumed to be less sensitive to the visual illusion...
July 11, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28705456/feeling-touch-on-the-own-hand-restores-the-capacity-to-visually-discriminate-it-from-someone-else-hand-pathological-embodiment-receding-in-brain-damage-patients
#16
Carlotta Fossataro, Valentina Bruno, Patrizia Gindri, Lorenzo Pia, Anna Berti, Francesca Garbarini
The sense of body ownership, i.e., the belief that a specific body part belongs to us, can be selectively impaired in brain-damaged patients. Recently, a pathological form of embodiment has been described in patients who, when the examiner's hand is located in a body-congruent position, systematically claim that it is their own hand (E+ patients). This paradoxical behavior suggests that, in these patients, the altered sense of body ownership also affects their capacity of visually discriminating the body-identity details of the own and the alien hand, even when both hands are clearly visible on the table...
June 23, 2017: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/28701936/an-adaptation-induced-repulsion-illusion-in-tactile-spatial-perception
#17
Lux Li, Arielle Chan, Shah M Iqbal, Daniel Goldreich
Following focal sensory adaptation, the perceived separation between visual stimuli that straddle the adapted region is often exaggerated. For instance, in the tilt aftereffect illusion, adaptation to tilted lines causes subsequently viewed lines with nearby orientations to be perceptually repelled from the adapted orientation. Repulsion illusions in the nonvisual senses have been less studied. Here, we investigated whether adaptation induces a repulsion illusion in tactile spatial perception. In a two-interval forced-choice task, participants compared the perceived separation between two point-stimuli applied on the forearms successively...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28698615/influence-of-the-body-schema-on-multisensory-integration-evidence-from-the-mirror-box-illusion
#18
Yuqi Liu, Jared Medina
When placing one hand on each side of a mirror and making synchronous bimanual movements, the mirror-reflected hand feels like one's own hand that is hidden behind the mirror. We developed a novel mirror box illusion to investigate whether motoric, but not spatial, visuomotor congruence is sufficient for inducing multisensory integration, and importantly, if biomechanical constraints encoded in the body schema influence multisensory integration. Participants placed their hands in a mirror box in opposite postures (palm up, palm down), creating a conflict between visual and proprioceptive feedback for the hand behind the mirror...
July 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28687328/representing-dynamic-stimulus-information-during-occlusion
#19
Jim Maarseveen, Chris L E Paffen, Frans A J Verstraten, Hinze Hogendoorn
Human observers maintain a representation of the visual features of objects when they become occluded. This representation facilitates the interpretation of occluded events and allows us to quickly identify objects upon reappearing. Here we investigated whether visual features that change over time are also represented during occlusion. To answer this question we used an illusion from the time perception domain in which the perceived duration of an event increases as its temporal frequency content increases...
September 2017: Vision Research
https://www.readbyqxmd.com/read/28687327/masking-of-random-walk-motion-by-flicker-and-its-role-in-the-allocation-of-motion-in-the-on-line-jitter-illusion
#20
Adela S Y Park, Phillip A Bedggood, Andrew B Metha, Andrew J Anderson
Typically, perceptual stabilization mechanisms make us unaware of the retinal image motion produced by the small, involuntary eye movements our eyes constantly make during fixation. The breakdown of perceptual stability is demonstrated by the on-line jitter illusion, in which a circular static pattern appears to jitter coherently when surrounded by a flickering annular pattern. Although both regions of the stimulus are subject to retinal motion from eye movements, the visual system attributes this motion to the central static region in the form of visual jitter, while the surrounding flickering region remains perceptually stable...
July 13, 2017: Vision Research
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