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https://www.readbyqxmd.com/read/29657743/rapid-recalibration-of-speech-perception-after-experiencing-the-mcgurk-illusion
#1
Claudia S Lüttke, Alexis Pérez-Bellido, Floris P de Lange
The human brain can quickly adapt to changes in the environment. One example is phonetic recalibration: a speech sound is interpreted differently depending on the visual speech and this interpretation persists in the absence of visual information. Here, we examined the mechanisms of phonetic recalibration. Participants categorized the auditory syllables /aba/ and /ada/, which were sometimes preceded by the so-called McGurk stimuli (in which an /aba/ sound, due to visual /aga/ input, is often perceived as 'ada')...
March 2018: Royal Society Open Science
https://www.readbyqxmd.com/read/29629824/making-room-for-second-language-phonotactics-effects-of-l2-learning-and-environment-on-first-language-speech-perception
#2
Matthew T Carlson
Language-specific restrictions on sound sequences in words can lead to automatic perceptual repair of illicit sound sequences. As an example, no Spanish words begin with /s/-consonant sequences ([#sC]), and where necessary (e.g., foreign loanwords) [#sC] is repaired by inserting an initial [e], (e.g. foreign loanwords, cf., esnob, from English snob). As a result, Spanish speakers tend to perceive an illusory [e] before [#sC] sequences. Interestingly, this perceptual illusion is weaker in early Spanish-English bilinguals, whose other language, English, allows [#sC]...
April 1, 2018: Language and Speech
https://www.readbyqxmd.com/read/29551734/removing-own-limb-visual-input-using-mixed-reality-mr-produces-a-telescoping-illusion-in-healthy-individuals
#3
Mikkel Thøgersen, John Hansen, Lars Arendt-Nielsen, Herta Flor, Laura Petrini
The purpose of the present study was to assess changes in body perception when visual feedback was removed from the hand and arm with the purpose of resembling the visual deprivation arising from amputation. The illusion was created by removing the visual feedback from the participants' own left forearm using a mixed reality (MR) and green screen environment. Thirty healthy persons (15 female) participated in the study. Each subject experienced two MR conditions, one with and one without visual feedback from the left hand, and a baseline condition with normal vision of the limb (no MR)...
March 15, 2018: Behavioural Brain Research
https://www.readbyqxmd.com/read/29513148/meridian-interference-reveals-neural-locus-of-motion-induced-position-shifts
#4
Sirui Liu, Peter Ulric Tse, Patrick Cavanagh
When a Gabor patch moves along a path in one direction while its internal texture drifts orthogonally to this path, it can appear to deviate from its physical path by 45 ̊ or more. This double-drift illusion is different from other motion-induced position shift effects in several ways: it has an integration period of over a second; the illusory displacement that accumulates over a second or more is orthogonal to rather than along the motion path; the perceptual deviations are much larger; and they have little or no effect on eye movements to the target...
March 7, 2018: Journal of Neurophysiology
https://www.readbyqxmd.com/read/29497481/increasing-perspectival-obliqueness-increases-the-leaning-tower-illusion
#5
Giulia Parovel, Alan Costall
The leaning tower illusion is a perceptual illusion in which two identical images of a tower photographed from below appear to diverge when juxtaposed. We manipulated the perceived obliqueness of the (upright) St Mark bell tower in Venice by modifying two parameters both related to the position of the camera with respect to the tower: (a) increasing the peripherality of the tower and (b) reducing the distance between the camera and the tower. The resulting images clearly show that the illusory leaning effect increases as a function of the obliqueness...
January 2018: I-Perception
https://www.readbyqxmd.com/read/29495721/timbral-shepard-illusion-reveals-ambiguity-and-context-sensitivity-of-brightness-perception
#6
Kai Siedenburg
Recent research has described strong effects of prior context on the perception of ambiguous pitch shifts of Shepard tones [Chambers, Akram, Adam, Pelofi, Sahani, Shamma, and Pressnitzer (2017). Nat. Commun. 8, 15027]. Here, similar effects are demonstrated for brightness shift judgments of harmonic complexes with cyclic spectral envelope components and fixed fundamental frequency. It is shown that frequency shifts of the envelopes are perceived as systematic shifts of brightness. Analogous to the work of Chambers et al...
February 2018: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/29485020/suboptimality-in-perceptual-decision-making
#7
Dobromir Rahnev, Rachel N Denison
Human perceptual decisions are often described as optimal. Critics of this view have argued that claims of optimality are overly flexible and lack explanatory power. Meanwhile, advocates for optimality have countered that such criticisms single out a few selected papers. To elucidate the issue of optimality in perceptual decision making, we review the extensive literature on suboptimal performance in perceptual tasks. We discuss eight different classes of suboptimal perceptual decisions, including improper placement, maintenance, and adjustment of perceptual criteria, inadequate tradeoff between speed and accuracy, inappropriate confidence ratings, misweightings in cue combination, and findings related to various perceptual illusions and biases...
February 27, 2018: Behavioral and Brain Sciences
https://www.readbyqxmd.com/read/29474874/audiovisual-plasticity-following-early-abnormal-visual-experience-reduced-mcgurk-effect-in-people-with-one-eye
#8
Stefania S Moro, Jennifer K E Steeves
Previously, we have shown that people who have had one eye surgically removed early in life during visual development have enhanced sound localization [1] and lack visual dominance, commonly observed in binocular and monocular (eye-patched) viewing controls [2]. Despite these changes, people with one eye integrate auditory and visual components of multisensory events optimally [3]. The current study investigates how people with one eye perceive the McGurk effect, an audiovisual illusion where a new syllable is perceived when visual lip movements do not match the corresponding sound [4]...
February 21, 2018: Neuroscience Letters
https://www.readbyqxmd.com/read/29453491/does-hearing-aid-use-affect-audiovisual-integration-in-mild-hearing-impairment
#9
Anja Gieseler, Maike A S Tahden, Christiane M Thiel, Hans Colonius
There is converging evidence for altered audiovisual integration abilities in hearing-impaired individuals and those with profound hearing loss who are provided with cochlear implants, compared to normal-hearing adults. Still, little is known on the effects of hearing aid use on audiovisual integration in mild hearing loss, although this constitutes one of the most prevalent conditions in the elderly and, yet, often remains untreated in its early stages. This study investigated differences in the strength of audiovisual integration between elderly hearing aid users and those with the same degree of mild hearing loss who were not using hearing aids, the non-users, by measuring their susceptibility to the sound-induced flash illusion...
April 2018: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/29450832/perceptual-modification-of-the-built-environment-to-influence-behavior-associated-with-physical-activity-quasi-experimental-field-studies-of-a-stair-banister-illusion
#10
Rich Masters, Catherine Capio, Jamie Poolton, Liis Uiga
BACKGROUND: Re-engineering the built environment to influence behaviors associated with physical activity potentially provides an opportunity to promote healthier lifestyles at a population level. Here we present evidence from two quasi-experimental field studies in which we tested a novel, yet deceptively simple, intervention designed to alter perception of, and walking behavior associated with, stairs in an urban area. OBJECTIVES: Our objectives were to examine whether adjusting a stair banister has an influence on perceptions of stair steepness or on walking behavior when approaching the stairs...
February 15, 2018: Sports Medicine
https://www.readbyqxmd.com/read/29447183/a-mass-density-model-can-account-for-the-size-weight-illusion
#11
Christian Wolf, Wouter M Bergmann Tiest, Knut Drewing
When judging the heaviness of two objects with equal mass, people perceive the smaller and denser of the two as being heavier. Despite the large number of theories, covering bottom-up and top-down approaches, none of them can fully account for all aspects of this size-weight illusion and thus for human heaviness perception. Here we propose a new maximum-likelihood estimation model which describes the illusion as the weighted average of two heaviness estimates with correlated noise: One estimate derived from the object's mass, and the other from the object's density, with estimates' weights based on their relative reliabilities...
2018: PloS One
https://www.readbyqxmd.com/read/29431259/the-snow-tire-illusion-different-levels-of-perceptual-assimilation-across-a-single-stimulus-configuration
#12
Tanja Gulan, Pavle Valerjev, Marin Dujmović
While observing a specific traffic sign in the field, we noticed an apparent distortion of size and shape of the circle that contained the sign. This novel illusion manifests as a distortion of the horizontal compared to the vertical dimension of the sign. The illusion seems to be underlined by similar mechanisms to those in the Delboeuf illusion. The aim of our study was to determine the existence and magnitude of the snow tire illusion. We conducted two experiments using the method of constant stimuli. The first experiment was conducted on the standard sign, while in the second, the stimuli were rotated 90° counterclockwise...
February 12, 2018: PsyCh Journal
https://www.readbyqxmd.com/read/29430753/reduced-low-frequency-power-and-phase-locking-reflect-restoration-in-the-auditory-continuity-illusion
#13
Mathis Kaiser, Daniel Senkowski, Yadira Roa Romero, Lars Riecke, Julian Keil
Interruptions in auditory input can be perceptually restored if they coincide with a masking sound, resulting in a continuity illusion. Previous studies have shown that this continuity illusion is associated with reduced low-frequency neural oscillations in the auditory cortex. However, the precise contribution of oscillatory amplitude changes and phase alignment to auditory restoration remains unclear. Using electroencephalography, we investigated induced power changes and phase locking in response to 3 Hz amplitude-modulated tones during the interval of an interrupting noise...
February 11, 2018: European Journal of Neuroscience
https://www.readbyqxmd.com/read/29426819/offenders-become-the-victim-in-virtual-reality-impact-of-changing-perspective-in-domestic-violence
#14
S Seinfeld, J Arroyo-Palacios, G Iruretagoyena, R Hortensius, L E Zapata, D Borland, B de Gelder, M Slater, M V Sanchez-Vives
The role of empathy and perspective-taking in preventing aggressive behaviors has been highlighted in several theoretical models. In this study, we used immersive virtual reality to induce a full body ownership illusion that allows offenders to be in the body of a victim of domestic abuse. A group of male domestic violence offenders and a control group without a history of violence experienced a virtual scene of abuse in first-person perspective. During the virtual encounter, the participants' real bodies were replaced with a life-sized virtual female body that moved synchronously with their own real movements...
February 9, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29407592/spontaneous-imitative-movements-induced-by-an-illusory-embodied-fake-hand
#15
Satoshi Shibuya, Satoshi Unenaka, Takuro Zama, Sotaro Shimada, Yukari Ohki
In the rubber hand illusion (RHI), individuals perceive a fake hand as their own when the hidden real hand and visible fake hand are synchronously stroked. Several RHI studies have reported that visual manipulation of the embodied fake hand inversely affects the perceptual processing of the observer's own hand (e.g., thermal or pain sensitivity). In this study, we examined whether motor manipulation of the fake hand similarly affects the observer's motor system. Our study employed a novel RHI paradigm wherein stroking was interrupted by unexpected movement of the fake hand (i...
March 2018: Neuropsychologia
https://www.readbyqxmd.com/read/29398218/a-perceptual-inference-mechanism-for-hallucinations-linked-to-striatal-dopamine
#16
Clifford M Cassidy, Peter D Balsam, Jodi J Weinstein, Rachel J Rosengard, Mark Slifstein, Nathaniel D Daw, Anissa Abi-Dargham, Guillermo Horga
Hallucinations, a cardinal feature of psychotic disorders such as schizophrenia, are known to depend on excessive striatal dopamine. However, an underlying cognitive mechanism linking dopamine dysregulation and the experience of hallucinatory percepts remains elusive. Bayesian models explain perception as an optimal combination of prior expectations and new sensory evidence, where perceptual distortions such as illusions and hallucinations may occur if prior expectations are afforded excessive weight. Such excessive weight of prior expectations, in turn, could stem from a gain-control process controlled by neuromodulators such as dopamine...
February 19, 2018: Current Biology: CB
https://www.readbyqxmd.com/read/29369683/tool-use-changes-the-spatial-extension-of-the-magnetic-touch-illusion
#17
Arvid Guterstam, Joanna Szczotka, Hugo Zeberg, H Henrik Ehrsson
Characterizing the brain mechanisms that allow humans to use tools to interact with the environment is a major goal in neuroscience. It has been proposed that handheld tools are incorporated into the multisensory representation of the body and its surrounding (peripersonal) space, underlying our remarkable tool use ability. One single-cell recording study in tool-using monkeys provided qualitative support for this hypothesis, and the results from a vast number of human studies employing different experimental paradigms have been ambiguous...
February 2018: Journal of Experimental Psychology. General
https://www.readbyqxmd.com/read/29358371/tactile-distance-illusions-reflect-a-coherent-stretch-of-tactile-space
#18
Federico Fiori, Matthew R Longo
Illusions of the perception of distance between two touches on the skin have been described since the classic work of Weber in the 19th century. The perceptual mechanisms underlying such spatial distortions, however, remain poorly understood. One potential interpretation is that the representational space of touch is related to the true structure of the skin by a geometrically simple stretch. If distortions of tactile distance perception reflect a simple stretch of tactile space, perceived distance should vary predictably as a function of the orientation of the stimulus on the skin, showing a sinusoidal pattern...
January 22, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29289928/tool-use-produces-a-size-illusion-revealing-action-specific-perceptual-mechanisms
#19
Jihyun Suh, Richard A Abrams
In four experiments, participants estimated the sizes of target objects that were either out of reach, or that could be reached by a tool (a stylus or laser pointer). Objects reachable with the aid of a tool were perceived to be smaller than identical objects without a tool. Participants' responses to questioning rule out demand characteristics as an explanation. This new size illusion may reflect a direct impact of tool use on perceived size, or it may stem from the effects of tool use on perceived distance...
February 2018: Acta Psychologica
https://www.readbyqxmd.com/read/29289094/musical-and-linguistic-listening-modes-in-the-speech-to-song-illusion-bias-timing-perception-and-absolute-pitch-memory
#20
Emily Graber, Rhimmon Simchy-Gross, Elizabeth Hellmuth Margulis
The speech-to-song (STS) illusion is a phenomenon in which some spoken utterances perceptually transform to song after repetition [Deutsch, Henthorn, and Lapidis (2011). J. Acoust. Soc. Am. 129, 2245-2252]. Tierney, Dick, Deutsch, and Sereno [(2013). Cereb. Cortex. 23, 249-254] developed a set of stimuli where half tend to transform to perceived song with repetition and half do not. Those that transform and those that do not can be understood to induce a musical or linguistic mode of listening, respectively...
December 2017: Journal of the Acoustical Society of America
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