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https://www.readbyqxmd.com/read/28505664/temporal-brightness-illusion-changes-color-perception-of-the-dress
#1
Laila Hugrass, Jana Slavikova, Melissa Horvat, Alaa Al Musawi, David Crewther
"The dress" has provoked intensive commentary among psychophysicists, especially in relation to color vision. Researchers have shown that manipulating illuminance cues can influence the perceived colors of the dress. Here we investigate whether illusory shifts in brightness can shift color perception of the dress. Drifting achromatic gratings with fast off and fast on shading profiles are known to give an illusion of brightening or darkening, respectively. We superimposed rotating sawtooth gratings on a series of dress images that morphed from extreme white/gold through to blue/black...
May 1, 2017: Journal of Vision
https://www.readbyqxmd.com/read/28496425/verbalizations-affect-visuomotor-control-in-hitting-objects-to-distant-targets
#2
Raimey Olthuis, John Van Der Kamp, Simone Caljouw
There is a long-standing proposal for the existence of two neuroanatomically and functionally separate visual systems; one supported by the dorsal pathway to control action and the second supported by the ventral pathway to handle explicit perceptual judgments. The dorsal pathway requires fast access to egocentric information, while the ventral pathway primarily requires allocentric information. Despite the evidence for functionally distinct systems, researchers have posited important interactions. This paper examines evidence to what degree the interaction becomes more important when target-identity, the perception of which is supported by the ventral stream, is verbalized during the execution of a target-directed far-aiming movement...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28454717/errors-in-interception-can-be-predicted-from-errors%C3%A2-in-perception
#3
Cristina de la Malla, Jeroen B J Smeets, Eli Brenner
It has been hypothesised that our actions are less susceptible to visual illusions than our perceptual judgements because similar information is processed for perception and action in separate pathways. We test this hypothesis for subjects intercepting a moving object that appears to move at a different speed than its true speed due to an illusion. The object was a moving Gabor patch: a sinusoidal grating of which the luminance contrast is modulated by a two-dimensional Gaussian. We manipulated the patch's apparent speed by moving the grating relative to the Gaussian...
April 3, 2017: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/28447846/attentional-state-modulates-the-effect-of-an-irrelevant-stimulus-dimension-on-perception
#4
Björn Herrmann, Ingrid S Johnsrude
Covariations of acoustic features provide redundancy in rapidly changing soundscapes: Hearing one feature enables a listener to infer another if these 2 features normally covary. However, it is unknown whether situational demands affect the degree to which covariations influence perceptual inferences. We exploited a perceptual interdependency between modulation rate and frequency and examined, in 6 experiments, whether challenging situations would alter the degree to which people rely on frequency information to make decisions about modulation rate...
April 27, 2017: Journal of Experimental Psychology. Human Perception and Performance
https://www.readbyqxmd.com/read/28410476/fear-reactivity-to-cognitive-dyscontrol-via-novel-head-mounted-display-perceptual-illusion-exercises
#5
Daniel W Capron, Aaron M Norr, Brian J Albanese, Norman B Schmidt
BACKGROUND: Anxiety sensitivity cognitive concerns (ASCC), refer to fears of mental catastrophe or losing control over mental processes. Recent findings show that ASCC are related to suicide risk, mood disorders and trauma-related disorders. Using controlled experimental psychopathology paradigms could be one heretofore unutilized method of increasing understanding of ASCC. Our goal was to test fear reactivity to four head-mounted display perceptual illusion challenges designed to bring on feelings of cognitive dyscontrol (i...
April 7, 2017: Journal of Affective Disorders
https://www.readbyqxmd.com/read/28388483/illusions-of-integration-are-subjectively-impenetrable-phenomenological-experience-of-lag-1-percepts-during-dual-target-rsvp
#6
Luca Simione, Elkan G Akyürek, Valentina Vastola, Antonino Raffone, Howard Bowman
We investigated the relationship between different kinds of target reports in a rapid serial visual presentation task, and their associated perceptual experience. Participants reported the identity of two targets embedded in a stream of stimuli and their associated subjective visibility. In our task, target stimuli could be combined together to form more complex ones, thus allowing participants to report temporally integrated percepts. We found that integrated percepts were associated with high subjective visibility scores, whereas reports in which the order of targets was reversed led to a poorer perceptual experience...
April 4, 2017: Consciousness and Cognition
https://www.readbyqxmd.com/read/28362898/dynamic-modulation-of-illusory-and-physical-target-size-on-separate-and-coordinated-eye-and-hand-movements
#7
Christine M Gamble, Joo-Hyun Song
In everyday behavior, two of the most common visually guided actions-eye and hand movements-can be performed independently, but are often synergistically coupled. In this study, we examine whether the same visual representation is used for different stages of saccades and pointing, namely movement preparation and execution, and whether this usage is consistent between independent and naturalistic coordinated eye and hand movements. To address these questions, we used the Ponzo illusion to dissociate the perceived and physical sizes of visual targets and measured the effects on movement preparation and execution for independent and coordinated saccades and pointing...
March 1, 2017: Journal of Vision
https://www.readbyqxmd.com/read/28345944/enhanced-integration-of-multisensory-body-information-by-proximity-to-habitual-action-space
#8
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
#9
COMPARATIVE STUDY
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
#10
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
#11
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
#12
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
#13
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
#14
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
#15
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
#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/28228928/rotating-snakes-illusion-quantitative-analysis-reveals-a-region-in-luminance-space-with-opposite-illusory-rotation
#17
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
#18
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
#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/28184316/perceptual-distortions-and-deceptions-what-computers-can-teach-us
#20
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
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