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Uesaki M, Biswas A, Ashida H, Maus G. Blue-yellow combination enhances perceived motion in Rotating Snakes illusion. Iperception 2024; 15:20416695241242346. [PMID: 38577220 PMCID: PMC10989047 DOI: 10.1177/20416695241242346] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2023] [Accepted: 03/09/2024] [Indexed: 04/06/2024] Open
Abstract
The Rotating Snakes illusion is a visual illusion where a stationary image elicits a compelling sense of anomalous motion. There have been recurring albeit anecdotal claims that the perception of illusory motion is more salient when the image consists of patterns with the combination of blue and yellow; however, there is limited empirical evidence that supports those claims. In the present study, we aimed to assess whether the Rotating Snakes illusion is more salient in its blue-yellow variation, compared to red-green and greyscale variations when the luminance of corresponding elements within the patterns were equated. Using the cancellation method, we found that the velocity required to establish perceptual stationarity was indeed greater for the stimulus composed of patterns with a blue-yellow combination than the other two variants. Our findings provide, for the first time, empirical evidence that the presence of colour affects the magnitude of illusion in the Rotating Snakes illusion.
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Affiliation(s)
- Maiko Uesaki
- Center for Information and Neural Networks (CiNet), Advanced ICT Research Institute, National Institute of Information and Communications Technology (NICT), Suita, Osaka, Japan
- Graduate School of Frontier Biosciences, Osaka University, Suita, Osaka, Japan
- School of Social Sciences, Nanyang Technological University, Singapore
| | - Arnab Biswas
- School of Social Sciences, Nanyang Technological University, Singapore
- Department of Psychology, University of Nevada Reno, Reno, NV, USA
| | - Hiroshi Ashida
- Graduate School of Letters, Kyoto University, Kyoto, Kyoto, Japan
| | - Gerrit Maus
- School of Social Sciences, Nanyang Technological University, Singapore
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2
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Lisi M, Cavanagh P. Different extrapolation of moving object locations in perception, smooth pursuit, and saccades. J Vis 2024; 24:9. [PMID: 38546586 PMCID: PMC10996402 DOI: 10.1167/jov.24.3.9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2023] [Accepted: 02/01/2024] [Indexed: 04/07/2024] Open
Abstract
The ability to accurately perceive and track moving objects is crucial for many everyday activities. In this study, we use a "double-drift stimulus" to explore the processing of visual motion signals that underlie perception, pursuit, and saccade responses to a moving object. Participants were presented with peripheral moving apertures filled with noise that either drifted orthogonally to the aperture's direction or had no net motion. Participants were asked to saccade to and track these targets with their gaze as soon as they appeared and then to report their direction. In the trials with internal motion, the target disappeared at saccade onset so that the first 100 ms of the postsaccadic pursuit response was driven uniquely by peripheral information gathered before saccade onset. This provided independent measures of perceptual, pursuit, and saccadic responses to the double-drift stimulus on a trial-by-trial basis. Our analysis revealed systematic differences between saccadic responses, on one hand, and perceptual and pursuit responses, on the other. These differences are unlikely to be caused by differences in the processing of motion signals because both saccades and pursuits seem to rely on shared target position and velocity information. We conclude that our results are instead due to a difference in how the processing mechanisms underlying perception, pursuit, and saccades combine motor signals with target position. These findings advance our understanding of the mechanisms underlying dissociation in visual processing between perception and eye movements.
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Affiliation(s)
- Matteo Lisi
- Department of Psychology, Royal Holloway, University of London, London, UK
| | - Patrick Cavanagh
- Department of Psychology, Glendon College, Toronto, Ontario, Canada
- Department Psychological and Brain Sciences, Dartmouth College, Hanover, NH, USA
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3
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Schellekes A. Stations Along the Via Dolorosa Towards Good-Enough Endings. Am J Psychoanal 2024; 84:94-110. [PMID: 38454110 DOI: 10.1057/s11231-024-09432-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/09/2024]
Abstract
This article focuses on the prevailing aspiration to reach a "good-enough ending" in analysis, a concept that is partly realistic and partly illusional. I discuss some of the obstacles that interfere with achieving this yearned for goal, and lead to endings that are far from the misleading illusion of the good-enough termination, that many of us believe we have achieved and are many more than it is commonly reported. I describe characteristics, obstacles, blockages, dreads within the analysand, within the analyst and in the space in between, which lead to endings which are far from good enough, by any criteria we might choose. These obstacles include the failure to distinguish between "real" versus "similar to"; emotional excess; emptying out of internal resources and toxemia of therapy/analysis; a fascination with certain levels of mind versus a neglect of others; osmotic pressure for oneness and the terror of perfection; and malignant nostalgia. Reflecting on such complex facets in the analytic process is relevant not only for a deeper understanding of illusions that we and our analysands hold with regard to endings, but also, implicitly, to the understanding of illusions, beliefs, and myths we and our patients have regarding beginnings.
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4
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Contemori G, Meneghini G, Battaglini L. An Illusory Motion in Stationary Stimuli Alters Their Perceived Duration. Vision (Basel) 2023; 7:61. [PMID: 37756135 PMCID: PMC10537486 DOI: 10.3390/vision7030061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2023] [Revised: 09/07/2023] [Accepted: 09/14/2023] [Indexed: 09/29/2023] Open
Abstract
Despite having equal duration, stimuli in physical motion are perceived to last longer than static ones. Here, we investigate whether illusory motion stimuli produce a time-dilation effect similar to physical motion. Participants performed a duration discrimination task that compared the perceived duration of static stimuli with and without illusory motion to a reference stimulus. In the first experiment, we observed a 4% increase in the number of "longer" responses for the illusory motion images than static stimuli with equal duration. The time-dilation effect, quantified as a shift in the Point of Subjective Equality (PSE), was approximately 55 ms for a 2-second stimulus. Although small, the effect was replicated in a second experiment in which the total number of standard-duration repetitions was reduced from 73 to 19. In the third experiment, we found a positive linear trend between the strength of the illusory motion and the magnitude of the time-dilation effect. These results demonstrate that, similar to physical motion stimuli, illusory motion stimuli are perceived to last longer than static stimuli. Furthermore, the strength of the illusion influences the extent of the lengthening of perceived duration.
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Affiliation(s)
- Giulio Contemori
- Department of General Psychology, University of Padova, Via Venezia 8, 35131 Padova, Italy;
| | - Giulia Meneghini
- Padova Neuroscience Center, University of Padova, 35131 Padova, Italy;
- Department of Neuroscience, University of Padova, 35131 Padova, Italy
| | - Luca Battaglini
- Department of General Psychology, University of Padova, Via Venezia 8, 35131 Padova, Italy;
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5
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Lin C, Shams L. The box-circle illusion. Perception 2023; 52:670-675. [PMID: 37427447 PMCID: PMC10469466 DOI: 10.1177/03010066231186557] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2022] [Accepted: 06/19/2023] [Indexed: 07/11/2023]
Abstract
A novel geometrical optical illusion is reported in this article: the horizontal distances of the contextual structures distort the perceived vertical positions of observed objects. Specifically, the illusion manifests in the form of connected boxes of varying widths but equal heights, each containing a circle at the center. Despite identical vertical positioning of the circles, they appear misaligned. The illusion diminishes when the boxes are removed. Potential underlying mechanisms are discussed.
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Affiliation(s)
- Chenyang Lin
- University of California, Los Angeles, United States
| | - Ladan Shams
- University of California, Los Angeles, United States
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6
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Hamilton T. Illusions Encountered in Teaching-Learning: A New Perspective. Nurs Sci Q 2023; 36:234-236. [PMID: 37309154 DOI: 10.1177/08943184231169742] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
In this column, the author explains that there are illusions in teaching-learning in nurse education; sometimes they do not honor the values of teachers or learners. From a humanbecoming perspective, nurse educators cocreate an educational journey with learners, valuing the indivisible, unpredictable, everchanging humanuniverse in coming-to-know the truth for the moment.
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Affiliation(s)
- Teresa Hamilton
- Professor, College of Nursing, California University, Riverside, CA, USA
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7
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Ashida H, Kitaoka A. The zooming-speed illusion: A meta illusion? Iperception 2023; 14:20416695231187800. [PMID: 37745725 PMCID: PMC10515532 DOI: 10.1177/20416695231187800] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Accepted: 06/20/2023] [Indexed: 09/26/2023] Open
Abstract
A movie taken from the front window of a running train, with zooming in and out, has been popularly acknowledged as a perceptual illusion such that the train motion is perceived as much slower when zoomed in. This is, however, not a real illusion because the image speed varies as a function of the focal length of the lens. This could be a meta-illusion, that is, an illusory sense of illusion, that might reflect a lack of understanding of how zooming changes the geometrical structure of the image.
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8
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Huggett N. Commentary: "Physical time within human time" and "Bridging the neuroscience and physics of time". Front Psychol 2023; 14:1087695. [PMID: 37388656 PMCID: PMC10301736 DOI: 10.3389/fpsyg.2023.1087695] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2022] [Accepted: 05/11/2023] [Indexed: 07/01/2023] Open
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9
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Paganini E. Commentary: Physical time within human time. Front Psychol 2023; 14:1094736. [PMID: 37342646 PMCID: PMC10278533 DOI: 10.3389/fpsyg.2023.1094736] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2022] [Accepted: 05/03/2023] [Indexed: 06/23/2023] Open
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10
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Vasilev D, Raposo I, Totah NK. Brightness illusions evoke pupil constriction preceded by a primary visual cortex response in rats. Cereb Cortex 2023:7084649. [PMID: 36958811 DOI: 10.1093/cercor/bhad090] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2022] [Revised: 02/25/2023] [Accepted: 02/27/2023] [Indexed: 03/25/2023] Open
Abstract
The mind affects the body via central nervous system (CNS) control of the autonomic nervous system (ANS). In humans, one striking illustration of the "mind-body" connection is that illusions, subjectively perceived as bright, drive pupil constriction. The CNS network driving this pupil response is unknown and requires an animal model for investigation. However, the pupil response to this illusion has long been thought to occur only in humans. Here, we report that the same brightness illusion that evokes pupil constriction in humans also does so in rats. We surveyed the role of most of rat cortex in this "mind-body" connection by recording cortex-wide EEG. These recordings revealed that, compared to a luminance-matched control stimulus, the illusion of brightness for a specific stimulus color and size, evoked a larger response in primary visual cortex (V1) and not in secondary visual, parietal, or frontal cortex. The response preceded pupil constriction suggesting a potential causal role of V1 on the pupil. Our results provide evidence that this "mind-body" connection is not confined to humans and that V1 may be part of a mammalian CNS network for bodily reactions to illusions.
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Affiliation(s)
- Dmitrii Vasilev
- Helsinki Institute of Life Science (HILIFE), University of Helsinki, 00014 Helsinki, Finland
- Faculty of Pharmacy, University of Helsinki, 00014 Helsinki, Finland
- Max Planck Institute for Biological Cybernetics, 72076 Tuebingen, Germany
| | - Isabel Raposo
- Max Planck Institute for Biological Cybernetics, 72076 Tuebingen, Germany
| | - Nelson K Totah
- Helsinki Institute of Life Science (HILIFE), University of Helsinki, 00014 Helsinki, Finland
- Faculty of Pharmacy, University of Helsinki, 00014 Helsinki, Finland
- Max Planck Institute for Biological Cybernetics, 72076 Tuebingen, Germany
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11
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Loeb GE. Remembrance of things perceived: Adding thalamocortical function to artificial neural networks. Front Integr Neurosci 2023; 17:1108271. [PMID: 36959924 PMCID: PMC10027940 DOI: 10.3389/fnint.2023.1108271] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2022] [Accepted: 02/13/2023] [Indexed: 03/09/2023] Open
Abstract
Recent research has illuminated the complexity and importance of the thalamocortical system but it has been difficult to identify what computational functions it performs. Meanwhile, deep-learning artificial neural networks (ANNs) based on bio-inspired models of purely cortical circuits have achieved surprising success solving sophisticated cognitive problems associated historically with human intelligence. Nevertheless, the limitations and shortcomings of artificial intelligence (AI) based on such ANNs are becoming increasingly clear. This review considers how the addition of thalamocortical connectivity and its putative functions related to cortical attention might address some of those shortcomings. Such bio-inspired models are now providing both testable theories of biological cognition and improved AI technology, much of which is happening outside the usual academic venues.
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12
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Smith GE, Chouinard PA, Lin I, Tsoi KT, Agrillo C, Byosiere SE. Seeing Things: A Community Science Investigation into Motion Illusion Susceptibility in Domestic Cats (Felis silvestris catus) and Dogs (Canis lupus familiaris). Animals (Basel) 2022; 12. [PMID: 36552482 DOI: 10.3390/ani12243562] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2022] [Revised: 11/25/2022] [Accepted: 12/14/2022] [Indexed: 12/23/2022] Open
Abstract
Illusions-visual fields that distort perception-can inform the understanding of visual perception and its evolution. An example of one such illusion, the Rotating Snakes illusion, causes the perception of motion in a series of static concentric circles. The current study investigated pet dogs' and cats' perception of the Rotating Snakes illusion in a community science paradigm. The results reveal that neither species spent significantly more time at the illusion than at either of the controls, failing to indicate susceptibility to the illusion. Specific behavioral data at each stimulus reveal that the most common behaviors of both species were Inactive and Stationary, while Locomotion and Pawing were the least common, supporting the finding that susceptibility may not be present. This study is the first to examine susceptibility to the Rotating Snakes illusion in dogs, as well as to directly compare the phenomenon between dogs and cats. We suggest future studies might consider exploring alternative methods in testing susceptibility to motion illusions in non-human animals.
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13
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Rose D. More on realism, phenomenology, and causation, in reply to Cheng. Perception 2022; 51:853-858. [PMID: 36129072 DOI: 10.1177/03010066221127368] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
First, I agree with Cheng that the argument from illusions to indirect realism is controversial, especially as to what is meant by "realism," "veridical," and "sense data" and the background assumptions underlying them. I provide a finer specification of some of the sub-movements that were the specific concerns of my previous article, particularly phenomenology as it currently sees itself in perception research, and the relevance of illusions. Perception has turned out to be far more complex than traditional philosophy realized, as has been revealed by recent research in neuroscience and psychophysics. Lastly, I answer Cheng's question about the "causal exclusion argument" by suggesting it is obviated by the temporal substructure of metaphysical states, and I provide a detailed supporting case in Supplementary Material.
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Affiliation(s)
- David Rose
- School of Psychology, 3660University of Surrey, Guildford, UK
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14
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Cheng T. Illusions, objectivity, and non-reductive emergentism: Reply to Rose. Perception 2022; 51:847-852. [PMID: 36129073 DOI: 10.1177/03010066221127367] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
In the target article, David Rose makes an interesting and substantive case against a certain kind of sceptical view: "veridical perception is impossible in principle," combined with a certain version of anti-realism. He proceeds by first illustrating several ideas from George Orwell's seminal work, and then proposes that a certain kind of non-reductive, levelled emergentist metaphysics can help us respond to such scepticism. In this commentary, I join forces with Rose's case, but will point out that we need to take seriously two discussions in contemporary philosophy in order to make the realist case stronger: the argument from illusion and hallucination, and the causal exclusion argument. Only then do Rose and his allies can have a more satisfactory case for objectivity and realism.
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Affiliation(s)
- Tony Cheng
- 34913National Chengchi University, Taipei
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15
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Bach M. A failed attempt to explain relative motion illusions via motion blur, and a new sparse version. Iperception 2022; 13:20416695221124153. [PMID: 36119713 PMCID: PMC9478724 DOI: 10.1177/20416695221124153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2022] [Accepted: 08/18/2022] [Indexed: 12/02/2022] Open
Abstract
Visual patterns can evoke marked, even beautiful motion illusions even if they are
static; eye movements in all likelihood serve as temporal modulators. This paper
concentrates on Ouchi-type “relative” or “sliding” motion illusions. It outlines an
eye-motion-evoked motion-blur hypothesis, which does not correctly predict the shift
direction of maximal illusion. This failure led to a nearly new particularly simple
stimulus: an arrangement of dashed lines that strongly evokes a relative motion illusion,
the “orthogonal dotted lines sway.” The latter is well explained by motion
integration.
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Affiliation(s)
- Michael Bach
- Eye Center, Medical Center, University of Freiburg, Germany Faculty of Medicine, University of Freiburg, Germany
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16
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Kobayashi Y, Kitaoka A. Simple Assumptions to Improve Markov Illuminance and Reflectance. Front Psychol 2022; 13:915672. [PMID: 35874357 PMCID: PMC9305333 DOI: 10.3389/fpsyg.2022.915672] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2022] [Accepted: 06/06/2022] [Indexed: 11/13/2022] Open
Abstract
Murray recently introduced a novel computational lightness model, Markov illuminance and reflectance (MIR). MIR is a promising new approach that simulates human lightness processing using a conditional random field (CRF) where natural-scene statistics of reflectance and illumination are implemented. Although MIR can account for various lightness illusions and phenomena, it has limitations, such as the inability to predict reverse-contrast phenomena. In this study, we improved MIR performance by modifying its inference process, the prior on X-junctions, and that on general illumination changes. Our modified model improved predictions for Checkerboard assimilation, the simplified Checkershadow and its control figure, the influence of luminance noise, and White's effect and its several variants. In particular, White's effect is a partial reverse contrast that is challenging for computational models, so this improvement is a significant advance for the MIR framework. This study showed the high extensibility and potential of MIR, which shows the promise for further sophistication.
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Affiliation(s)
- Yuki Kobayashi
- Research Organization of Open Innovation and Collaboration, Ritsumeikan University, Ibaraki, Japan
- Japan Society for the Promotion of Science, Tokyo, Japan
| | - Akiyoshi Kitaoka
- College of Comprehensive Psychology, Ritsumeikan University, Ibaraki, Japan
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17
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Augenstein TE, Kortemeyer D, Glista L, Krishnan C. Enhancing Mirror Therapy via Scaling and Shared Control: A Novel Open-Source Virtual Reality Platform for Stroke Rehabilitation. Virtual Real 2022; 26:525-538. [PMID: 35600315 PMCID: PMC9119151 DOI: 10.1007/s10055-021-00593-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2021] [Accepted: 10/03/2021] [Indexed: 06/03/2023]
Abstract
Mirror therapy is increasingly used in stroke rehabilitation to improve functional movements of the affected limb. However, the extent of mirroring in conventional mirror therapy is typically fixed (1:1) and cannot be tailored based on the patient's impairment level. Further, the movements of the affected limb are not actively incorporated in the therapeutic process. To address these issues, we developed an immersive VR system using HTC Vive and Leap Motion, which communicates with our free and open-source software environment programmed using SteamVR and the Unity 3D gaming engine. The mirror therapy VR environment was incorporated with two novel features: (1) scalable mirroring and (2) shared control. In the scalable mirroring, mirror movements were programmed to be scalable between 0 and 1, where 0 represents no movements, 0.5 represents 50% mirroring, and 1 represents 100% mirroring. In shared control, the contribution of the mirroring limb to the movements was programmed to be scalable between 0 to 1, where 0 represents 100% contribution from the mirroring limb (i.e., no mirroring), 0.5 represents 50% of movements from the mirrored limb and 50% of movements from the mirroring limb, and 1 represents full mirroring (i.e., no shared movements). Validation experiments showed that these features worked appropriately. The proposed VR-based mirror therapy is the first fully developed system that is freely available to the rehabilitation science community. The scalable and shared control features can diversify mirror therapy and potentially augment the outcomes of rehabilitation, although this needs to be verified through future experiments.
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Affiliation(s)
- Thomas E. Augenstein
- Neuromuscular and Rehabilitation Robotics Laboratory (NeuRRo Lab), Department of Physical Medicine and Rehabilitation, Michigan Medicine, Ann Arbor, MI, USA
- Robotics Institute, University of Michigan, Ann Arbor, MI, USA
| | - Daniel Kortemeyer
- Neuromuscular and Rehabilitation Robotics Laboratory (NeuRRo Lab), Department of Physical Medicine and Rehabilitation, Michigan Medicine, Ann Arbor, MI, USA
| | - Lawrence Glista
- Neuromuscular and Rehabilitation Robotics Laboratory (NeuRRo Lab), Department of Physical Medicine and Rehabilitation, Michigan Medicine, Ann Arbor, MI, USA
- Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, MI, USA
| | - Chandramouli Krishnan
- Neuromuscular and Rehabilitation Robotics Laboratory (NeuRRo Lab), Department of Physical Medicine and Rehabilitation, Michigan Medicine, Ann Arbor, MI, USA
- Robotics Institute, University of Michigan, Ann Arbor, MI, USA
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI, USA
- School of Kinesiology, University of Michigan, Ann Arbor, MI, USA
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18
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Abstract
Ambiguous figures (aka bistable, multistable, or reversible images) have fascinated scientists as well as laypersons for centuries. It may be surprising indeed how one and the same physical depiction can be experienced in perceptual awareness in cardinally different ways. In the most well-known examples of such illusions of multistability, the phenomenal change relates just to visual organization. Much less common are perceptions of alternating emotional content in the ambiguous visual image. Here, I introduce one such example.
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Affiliation(s)
- Talis Bachmann
- Institute of Psychology and School of Law (Tallinn branch), Tallinn, Estonia
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19
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Thome I, Hohmann DM, Zimmermann KM, Smith ML, Kessler R, Jansen A. "I Spy with my Little Eye, Something that is a Face…": A Brain Network for Illusory Face Detection. Cereb Cortex 2021; 32:137-157. [PMID: 34322712 DOI: 10.1093/cercor/bhab199] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2021] [Revised: 04/26/2021] [Accepted: 05/27/2021] [Indexed: 11/12/2022] Open
Abstract
The most basic aspect of face perception is simply detecting the presence of a face, which requires the extraction of features that it has in common with other faces. Putatively, it is caused by matching high-dimensional sensory input with internal face templates, achieved through a top-down mediated coupling between prefrontal regions and brain areas in the occipito-temporal cortex ("core system of face perception"). Illusory face detection tasks can be used to study these top-down influences. In the present functional magnetic resonance imaging study, we showed that illusory face perception activated just as real faces the core system, albeit with atypical left-lateralization of the occipital face area. The core system was coupled with two distinct brain regions in the lateral prefrontal (inferior frontal gyrus, IFG) and orbitofrontal cortex (OFC). A dynamic causal modeling (DCM) analysis revealed that activity in the core system during illusory face detection was upregulated by a modulatory face-specific influence of the IFG, not as previously assumed by the OFC. Based on these findings, we were able to develop the most comprehensive neuroanatomical framework of illusory face detection until now.
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Affiliation(s)
- Ina Thome
- Department of Psychiatry, Laboratory for Multimodal Neuroimaging, University of Marburg, Marburg, Germany.,Center for Mind, Brain and Behavior (CMBB), University of Marburg and Justus Liebig University Giessen, Marburg, Germany
| | - Daniela M Hohmann
- Department of Psychiatry, Laboratory for Multimodal Neuroimaging, University of Marburg, Marburg, Germany.,Center for Mind, Brain and Behavior (CMBB), University of Marburg and Justus Liebig University Giessen, Marburg, Germany
| | - Kristin M Zimmermann
- Department of Psychiatry, Laboratory for Multimodal Neuroimaging, University of Marburg, Marburg, Germany.,Center for Mind, Brain and Behavior (CMBB), University of Marburg and Justus Liebig University Giessen, Marburg, Germany.,Department of Neurology and Neurorehabilitation, Hospital zum Heiligen Geist, Academic Teaching Hospital of the Heinrich-Heine-University Düsseldorf, Kempen, Germany
| | - Marie L Smith
- Department of Psychological Sciences, Birkbeck College, University of London, London, UK
| | - Roman Kessler
- Department of Psychiatry, Laboratory for Multimodal Neuroimaging, University of Marburg, Marburg, Germany.,Center for Mind, Brain and Behavior (CMBB), University of Marburg and Justus Liebig University Giessen, Marburg, Germany
| | - Andreas Jansen
- Department of Psychiatry, Laboratory for Multimodal Neuroimaging, University of Marburg, Marburg, Germany.,Center for Mind, Brain and Behavior (CMBB), University of Marburg and Justus Liebig University Giessen, Marburg, Germany.,Core-Facility BrainImaging, Faculty of Medicine, University of Marburg, Marburg, Germany
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20
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Affiliation(s)
- Talis Bachmann
- School of Law and Institute of Psychology, University of Tartu, Tartu, Estonia
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21
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Liu X, Li H, Wang Y, Lei T, Wang J, Spillmann L, Andolina IM, Wang W. From Receptive to Perceptive Fields: Size-Dependent Asymmetries in Both Negative Afterimages and Subcortical On and Off Post-Stimulus Responses. J Neurosci 2021; 41:7813-7830. [PMID: 34326144 PMCID: PMC8445057 DOI: 10.1523/jneurosci.0300-21.2021] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2021] [Revised: 07/11/2021] [Accepted: 07/13/2021] [Indexed: 11/21/2022] Open
Abstract
Negative afterimages are perceptual phenomena that occur after physical stimuli disappear from sight. Their origin is linked to transient post-stimulus responses of visual neurons. The receptive fields (RFs) of these subcortical ON- and OFF-center neurons exhibit antagonistic interactions between central and surrounding visual space, resulting in selectivity for stimulus polarity and size. These two features are closely intertwined, yet their relationship to negative afterimage perception remains unknown. Here we tested whether size differentially affects the perception of bright and dark negative afterimages in humans of both sexes, and how this correlates with neural mechanisms in subcortical ON and OFF cells. Psychophysically, we found a size-dependent asymmetry whereby dark disks produce stronger and longer-lasting negative afterimages than bright disks of equal contrast at sizes >0.8°. Neurophysiological recordings from retinal and relay cells in female cat dorsal lateral geniculate nucleus showed that subcortical ON cells exhibited stronger sustained post-stimulus responses to dark disks, than OFF cells to bright disks, at sizes >1°. These sizes agree with the emergence of center-surround antagonism, revealing stronger suppression to opposite-polarity stimuli for OFF versus ON cells, particularly in dorsal lateral geniculate nucleus. Using a network-based retino-geniculate model, we confirmed stronger antagonism and temporal transience for OFF-cell post-stimulus rebound responses. A V1 population model demonstrated that both strength and duration asymmetries can be propagated to downstream cortical areas. Our results demonstrate how size-dependent antagonism impacts both the neuronal post-stimulus response and the resulting afterimage percepts, thereby supporting the idea of perceptual RFs reflecting the underlying neuronal RF organization of single cells.SIGNIFICANCE STATEMENT Visual illusions occur when sensory inputs and perceptual outcomes do not match, and provide a valuable tool to understand transformations from neural to perceptual responses. A classic example are negative afterimages that remain visible after a stimulus is removed from view. Such perceptions are linked to responses in early visual neurons, yet the details remain poorly understood. Combining human psychophysics, neurophysiological recordings in cats and retino-thalamo-cortical computational modeling, our study reveals how stimulus size and the receptive-field structure of subcortical ON and OFF cells contributes to the parallel asymmetries between neural and perceptual responses to bright versus dark afterimages. Thus, this work provides a deeper link from the underlying neural mechanisms to the resultant perceptual outcomes.
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Affiliation(s)
- Xu Liu
- Institute of Neuroscience, Center for Excellence in Brain Science and Intelligence Technology, State Key Laboratory of Neuroscience, Key Laboratory of Primate Neurobiology, Chinese Academy of Sciences, Shanghai, 200031, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Hui Li
- Institute of Neuroscience, Center for Excellence in Brain Science and Intelligence Technology, State Key Laboratory of Neuroscience, Key Laboratory of Primate Neurobiology, Chinese Academy of Sciences, Shanghai, 200031, China
| | - Ye Wang
- State Key Laboratory of Media Convergence and Communication, Neuroscience and Intelligent Media Institute, Communication University of China, Beijing, 100024, China
| | - Tianhao Lei
- Institute of Neuroscience, Center for Excellence in Brain Science and Intelligence Technology, State Key Laboratory of Neuroscience, Key Laboratory of Primate Neurobiology, Chinese Academy of Sciences, Shanghai, 200031, China
| | - Jijun Wang
- Shanghai Mental Health Center, Shanghai Jiaotong University School of Medicine, Shanghai Key Laboratory of Psychotic Disorders, Shanghai, 200030, China
| | - Lothar Spillmann
- Department of Neurology, University of Freiburg, Freiburg, 79085, Germany
| | - Ian Max Andolina
- Institute of Neuroscience, Center for Excellence in Brain Science and Intelligence Technology, State Key Laboratory of Neuroscience, Key Laboratory of Primate Neurobiology, Chinese Academy of Sciences, Shanghai, 200031, China
- Shanghai Center for Brain and Brain-inspired Intelligence Technology, Shanghai, 200031, China
| | - Wei Wang
- Institute of Neuroscience, Center for Excellence in Brain Science and Intelligence Technology, State Key Laboratory of Neuroscience, Key Laboratory of Primate Neurobiology, Chinese Academy of Sciences, Shanghai, 200031, China
- Shanghai Center for Brain and Brain-inspired Intelligence Technology, Shanghai, 200031, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
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22
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Senthilkumaran S, Rizwan T, Elangovan N, Usman MS, Menezes RG, Thirumalaikolundusubramanian P. Visual Hallucinations After a Russell's Viper Bite. Wilderness Environ Med 2021; 32:351-354. [PMID: 34301481 DOI: 10.1016/j.wem.2021.04.010] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2020] [Revised: 04/26/2021] [Accepted: 04/29/2021] [Indexed: 11/26/2022]
Abstract
Visual hallucinations (VHs) are extremely rare in snakebites. We report a case of Russell's viper bite in an otherwise healthy 55-y-old woman who presented to a hospital in south India with established clinical features of systemic and local envenomation, including coagulation failure, without any neurologic manifestations on admission. She reported simple VH on the third day, which abruptly stopped on the fifth day without any specific medications. Clinical, laboratory, imaging, and electrophysiological studies did not reveal any neuropsychiatric disorders. Including this case, only 5 cases of VH are documented in the literature, 2 following cobra and viper bites and 1 after a sea snake bite. Two cases were reported from Australia and 1 each from the United States, Iran, and India.
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Affiliation(s)
- Subramanian Senthilkumaran
- Department of Emergency & Critical Care, Manian Medical Centre, Erode, India; Department of Biotechnology, School of Biosciences, Periyar University, Salem, India
| | - Tehlil Rizwan
- Dow Medical College, Dow University of Health Sciences, Karachi, Pakistan.
| | - Namasivayam Elangovan
- Department of Biotechnology, School of Biosciences, Periyar University, Salem, India
| | | | - Ritesh G Menezes
- Forensic Medicine Division, Department of Pathology, College of Medicine, King Fahd Hospital of the University, Imam Abdulrahman Bin Faisal University, Dammam, Saudi Arabia
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23
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Abstract
As the aerospace industry has grown rapidly over the years, aviators and astronauts have been exposed to some abnormal physiological changes arising from the dynamics of the aerospace environment. The vestibular system, encoding linear and angular movements of the head, is one of the main affected systems in which those abnormal changes can occur during flight. Despite the intricate and solid organization, vestibular units are such delicate structures that they can easily be deceived by aerial dynamics and gravity changes. Therefore, it is of vital importance for the continuity of flight safety to be aware of the detrimental alterations and impairments regarding the vestibular system and its reflex pathways. The aim of this paper was to present a review about how a healthy vestibular system is negatively affected within the aerospace environment and how some vestibular disorders become exaggerated or impaired during aviation and space activities.
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Affiliation(s)
| | - Erdinç Aydın
- Department of Otorhinolaryngology, Başkent University Faculty of Medicine, Ankara, Turkey
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24
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Chaves TC, Stanton TR, Grant A, Pulling BW, Madden VJ, Newport R, Moseley GL. Imprecise Visual Feedback About Hand Location Increases a Classically Conditioned Pain Expectancy Effect. J Pain 2021; 22:748-761. [PMID: 33529708 DOI: 10.1016/j.jpain.2021.01.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/2020] [Revised: 11/27/2020] [Accepted: 01/03/2021] [Indexed: 11/27/2022]
Abstract
We tested the hypotheses that rendering sensory input about hand location imprecise increases a classically conditioned pain expectancy effect, increases generalization of the effect to novel locations and reduces extinction of the effect. Forty healthy volunteers performed movements with their right hand along predefined paths. Each path passed through 2 locations that were defined as either i) the conditioned stimulus (CS+; paired with a painful unconditioned stimulus), or ii) unpaired (CS-). During acquisition phase, participants watched their hand as they moved it. Participants were randomly allocated to an Imprecise group, for whom visual feedback of the hand was offset 30 to 50 mm from its true location, or a Precise group, for whom vision was not disrupted. In the test phase, participants moved their hands to 5 locations-the CS+, CS-, and 3 locations that lay between the 2 ("generalization stimuli"). Our primary hypothesis was supported-pain expectancy was greater at the CS+ location in the Imprecise group than in the Precise group (6.9 [SD = 1.9] vs 5.4 [SD = 2.5], P= .02). Pain expectancies generalized to novel locations similarly in both groups and there was no difference in extinction between groups. Our primary hypothesis was supported but our subsequent hypotheses were not. PERSPECTIVE: We conditioned pain expectancy at a certain location of one hand, even though most participants were unaware of the contingency. Conditioned pain expectancy was greater when sensory information about location was less precise. This adds support to the possibility that associative learning may play a role in the progression of an acute pain episode to a more generalized pain disorder.
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Affiliation(s)
- Thais Cristina Chaves
- IIMPACT in Health, University of South Australia, Adelaide, Australia; Department of Health Sciences, Ribeirão Preto Medical School, University of São Paulo - USP, Ribeirão Preto, SP, Brazil; Department of Physical Therapy, Federal University of São Carlos, São Carlos, Brazil.
| | - Tasha R Stanton
- IIMPACT in Health, University of South Australia, Adelaide, Australia
| | - Ashley Grant
- IIMPACT in Health, University of South Australia, Adelaide, Australia
| | - Brian W Pulling
- IIMPACT in Health, University of South Australia, Adelaide, Australia
| | - Victoria J Madden
- IIMPACT in Health, University of South Australia, Adelaide, Australia; Department of Anaesthesia and Perioperative Medicine and Department of Psychiatry and Mental Health, Neuroscience Institute, University of Cape Town, Cape Town, South Africa
| | - Roger Newport
- School of Psychology, University of Nottingham, Nottingham, UK; School of Sport, Exercise and Health Sciences, Loughborough University, Leicestershire, UK
| | - G Lorimer Moseley
- IIMPACT in Health, University of South Australia, Adelaide, Australia
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25
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Abstract
Haptic sensation of a material can be modulated by its visual appearance. A technique that utilizes this visual-haptic interaction is called as pseudo-haptic feedback. Conventional studies have investigated pseudo-haptic feedback in situations, wherein a user manipulated a virtual object using a computer mouse, a force-feedback device, etc. The present study investigated whether and how it was possible to offer pseudo-haptic feedback to a user who manipulated a virtual object using keystrokes. Participants moved a cursor toward a destination by pressing a key. While the cursor was moving, the cursor was temporarily slowed down on a square area of the screen. The participants’ task was to report, on a five-point scale, how much resistance they felt to the cursor’s movement. In addition to the basic speed of the cursor, the ratio of the basic speed to the speed within the square area was varied. In Experiment 1, we found that these two factors interacted significantly with each other, but further analysis showed that the cursor speed within the square area was the most important determinant of perceived resistance. In Experiment 2, consistent with the results of the previous experiment, it was found that the cursor movement outside of the square area was not required to generate the sense of resistance. Counterintuitively, in Experiment 3, the sense of resistance was apparent even without user’s keystrokes. We discuss how the sense of resistance for a cursor moved by keystrokes can be triggered visually, but interpreted by the brain as a haptic impression.
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Affiliation(s)
- Takahiro Kawabe
- NTT Communication Science Laboratories, Nippon Telegraph and Telephone Corporation, Atsugi, Japan
| | - Yusuke Ujitoko
- NTT Communication Science Laboratories, Nippon Telegraph and Telephone Corporation, Atsugi, Japan
| | - Takumi Yokosaka
- NTT Communication Science Laboratories, Nippon Telegraph and Telephone Corporation, Atsugi, Japan
| | - Scinob Kuroki
- NTT Communication Science Laboratories, Nippon Telegraph and Telephone Corporation, Atsugi, Japan
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26
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Hiris E, Zinnel L, Rickman H, Phillips J. The Misperception of Orientation in Depth When Processing Multiple Pictures With Linear Perspective Cues. Perception 2021; 50:438-461. [PMID: 33951949 DOI: 10.1177/03010066211007309] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
The leaning tower illusion suggests that combining perspective cues across multiple images can affect the perceived orientation of objects in space. We measured the accuracy of orientation perception when viewing multiple pictures. Across several experiments, 11-16 participants viewed two pictures: a sidewalk and either another sidewalk, a nature scene, or no picture. Participants adjusted an on-screen line to match the remembered orientation of one of the sidewalks. Participants also made a judgment about the parallelism of the sidewalks. Sidewalks perceived as parallel were perceived to have orientations more similar to each other than when they were paired with a nature scene or no picture. The degree of misperception can be approximately twice as large as in the leaning tower illusion, and this effect survived inversion and partially survived alternating presentation of the images. The misperception was eliminated when the participants were cued on which sidewalk they would be judging; however, when forced to process both sidewalks, the misperception reappeared. We conclude that the orientation of objects with perspective cues is misperceived when viewing multiple pictures with perspective cues and this misperception appears to be related at least in part to how parallel those objects are perceived to be.
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Affiliation(s)
- Eric Hiris
- University of Wisconsin-La Crosse, United States
| | - Laura Zinnel
- University of Wisconsin-La Crosse, United States
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27
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Anstis S, Cavanagh P. Flashed Müller-Lyer and Poggendorff Virtual Illusions. Iperception 2021; 12:20416695211015699. [PMID: 34104380 PMCID: PMC8167013 DOI: 10.1177/20416695211015699] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2021] [Accepted: 04/13/2021] [Indexed: 11/25/2022] Open
Abstract
A moving frame can dramatically displace the perceived location of stimuli flashed before and after the motion. Here, we use a moving frame to rearrange flashed elements into the form of classic illusions. Without the moving frame, the initial arrangement of the flashed elements has no illusory effect. The question is whether the frame-induced displacement of position precedes or follows the processes underlying the illusions. This illusory offset of flashed chevrons does generate a Müller-Lyer illusion and the illusory offset of two line segments does create a Poggendorff illusion. We conclude that the site where the frame-induced position shift emerges must precede the site at which the Müller-Lyer and Poggendorf illusions arise.
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Affiliation(s)
- Stuart Anstis
- Department of Psychology, University of
California, San Diego, La Jolla, United States
| | - Patrick Cavanagh
- Department of Psychology, Glendon College, CVR
York University, Toronto, ON, Canada Department of Psychological and Brain
Sciences, Dartmouth College, Hanover, NH, USA
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28
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Karlovich MW, Wallisch P. Scintillating Starbursts: Concentric Star Polygons Induce Illusory Ray Patterns. Iperception 2021; 12:20416695211018720. [PMID: 34777780 PMCID: PMC8580503 DOI: 10.1177/20416695211018720] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2020] [Accepted: 04/30/2021] [Indexed: 11/17/2022] Open
Abstract
Here, we introduce and explore Scintillating Starbursts, a stimulus type made up of concentric star polygons that induce illusory scintillating rays or beams. We test experimentally which factors, such as contrast and number of vertices, modulate how observers experience this stimulus class. We explain how the illusion arises from the interplay of known visual processes, specifically central versus peripheral vision, and interpret the phenomenology evoked by these patterns. We discuss how Starbursts differ from similar and related visual illusions such as illusory contours, grid illusions such as the pincushion grid illusion as well as moiré patterns.
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Affiliation(s)
| | - Pascal Wallisch
- Department of Psychology, New York University, New York City, New York, United States
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29
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Abstract
In the speech to song illusion, a spoken phrase begins to sound as if it is being sung after several repetitions. Castro et al. (2018) used Node Structure Theory (NST; MacKay, 1987), a model of speech perception and production, to explain how the illusion occurs. Two experiments further test the mechanisms found in NST-priming, activation, and satiation-as an account of the speech to song illusion. In Experiment 1, words varying in the phonological clustering coefficient influenced how quickly a lexical node could recover from satiation, thereby influencing the song-like ratings to lists of words that were high versus low in phonological clustering coefficient. In Experiment 2, we used equivalence testing (i.e., the TOST procedure) to demonstrate that once lexical nodes are satiated the higher level semantic information associated with the word cannot differentially influence song-like ratings to lists of words varying in emotional arousal. The results of these two experiments further support the NST account of the speech to song illusion.
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30
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Roberts JW, Gerber N, Wakefield CJ, Simmonds PJ. Dissociating the Influence of Perceptual Biases and Contextual Artifacts Within Target Configurations During the Planning and Control of Visually Guided Action. Motor Control 2021; 25:349-68. [PMID: 33811190 DOI: 10.1123/mc.2020-0054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2020] [Revised: 01/13/2021] [Accepted: 01/18/2021] [Indexed: 11/18/2022]
Abstract
The failure of perceptual illusions to elicit corresponding biases within movement supports the view of two visual pathways separately contributing to perception and action. However, several alternative findings may contest this overarching framework. The present study aimed to examine the influence of perceptual illusions within the planning and control of aiming. To achieve this, we manipulated and measured the planning/control phases by respectively perturbing the target illusion (relative size-contrast illusion; Ebbinghaus/Titchener circles) following movement onset and detecting the spatiotemporal characteristics of the movement trajectory. The perceptual bias that was indicated by the perceived target size estimates failed to correspondingly manifest within the effective target size. While movement time (specifically, time after peak velocity) was affected by the target configuration, this outcome was not consistent with the direction of the perceptual illusions. These findings advocate an influence of the surrounding contextual information (e.g., annuli) on movement control that is independent of the direction predicted by the illusion.
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31
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Taipale J. The illusion of contact: Insights from Winnicott's 1952 letter to Klein. Int J Psychoanal 2021; 102:31-50. [PMID: 33952009 DOI: 10.1080/00207578.2021.1878005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Using Winnicott's theory, this article produces an account of the individual's relation to a given conceptual framework. Whereas Winnicott's ideas have been almost exclusively discussed in developmental and psychopathological contexts, the present article extends Winnicott's theory and applies it to the problem of interpersonal understanding. Taking a lead from one of Winnicott's letters to Klein, the article investigates the problem of expressing one's idiosyncratic insights in the confines of a given conceptual framework. The article examines Winnicott's theory of compliance and creativity, discusses the plea that Winnicott makes to Klein, analyses the encounter with a "dead language", and investigates the asymmetrical structure of interpersonal understanding. Cashing out the latter in terms of an "illusion of contact", the article enhances our interpretation of the successes and shortcomings of interpersonal encounters - in everyday life, in clinical settings, and in the historical community of researchers. By focusing on the last mentioned in particular, the article brings forth neglected aspects of Winnicott's thinking and uses these to assess the conditions of an open dialogue within the psychoanalytic community.
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Affiliation(s)
- Joona Taipale
- Department of Social Sciences and Philosophy, University of Jyväskylä, Finland
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32
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LaMothe R. The Future of an Illusion: The Problem of Sovereignty. Psychoanal Rev 2021; 108:51-78. [PMID: 33617340 DOI: 10.1521/prev.2021.108.1.51] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The author explores the idea of sovereignty as an illusion that is and will continue to have deleterious effects on cooperative efforts to slow or stop climate change and the extinction of millions of species. To make this case, the notion of sovereignty is defined and its attributes described. This lays the foundation for arguing, from a psychoanalytic perspective, that sovereignty is a tightly held illusion (and practice). The last section of the article identifies the negative present and future impact of sovereignty with regard to the Anthropocene Age, as well as briefly identifying other possibilities for ordering societies.
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Affiliation(s)
- Ryan LaMothe
- St. Meinrad School of Theology 200 Hill Dr. St. Meinrad, IN 47577 E-mail:
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33
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Heydrich L, Walker F, Blättler L, Herbelin B, Blanke O, Aspell JE. Interoception and Empathy Impact Perspective Taking. Front Psychol 2021; 11:599429. [PMID: 33536971 PMCID: PMC7848222 DOI: 10.3389/fpsyg.2020.599429] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2020] [Accepted: 12/22/2020] [Indexed: 11/13/2022] Open
Abstract
Adopting the perspective of another person is an important aspect of social cognition and has been shown to depend on multisensory signals from one's own body. Recent work suggests that interoceptive signals not only contribute to own-body perception and self-consciousness, but also to empathy. Here we investigated if social cognition - in particular adopting the perspective of another person - can be altered by a systematic manipulation of interoceptive cues and further, if this effect depends on empathic ability. The own-body transformation task (OBT) - wherein participants are instructed to imagine taking the perspective and position of a virtual body presented on a computer screen - offers an effective way to measure reaction time differences linked to the mental effort of taking an other's perspective. Here, we adapted the OBT with the flashing of a silhouette surrounding the virtual body, either synchronously or asynchronously with the timing of participants' heartbeats. We evaluated the impact of this cardio-visual synchrony on reaction times and accuracy rates in the OBT. Empathy was assessed with the empathy quotient (EQ) questionnaire. Based on previous work using the cardio-visual paradigm, we predicted that synchronous (vs. asynchronous) cardio-visual stimulation would increase self-identification with the virtual body and facilitate participants' ability to adopt the virtual body's perspective, thereby enhancing performance on the task, particularly in participants with higher empathy scores. We report that participants with high empathy showed significantly better performance during the OBT task during synchronous versus asynchronous cardio-visual stimulation. Moreover, we found a significant positive correlation between empathic ability and the synchrony effect (the difference in reaction times between the asynchronous and synchronous conditions). We conclude that synchronous cardio-visual stimulation between the participant's body and a virtual body during an OBT task makes it easier to adopt the virtual body's perspective, presumably based on multisensory integration processes. However, this effect depended on empathic ability, suggesting that empathy, interoception and social perspective taking are inherently linked.
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Affiliation(s)
- Lukas Heydrich
- CORE Lab, Division of Psychosomatic Medicine, Department of Neurology, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland.,Laboratory of Cognitive Neuroscience, Brain-Mind Institute, School of Life Sciences, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
| | - Francesco Walker
- Laboratory of Cognitive Neuroscience, Brain-Mind Institute, School of Life Sciences, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
| | - Larissa Blättler
- Division of Psychosomatic Medicine, Department of Neurology, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland.,Department of Psychology, University of Bern, Bern, Switzerland
| | - Bruno Herbelin
- Laboratory of Cognitive Neuroscience, Brain-Mind Institute, School of Life Sciences, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland.,Center for Neuroprosthetics, School of Life Sciences, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
| | - Olaf Blanke
- Laboratory of Cognitive Neuroscience, Brain-Mind Institute, School of Life Sciences, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland.,Center for Neuroprosthetics, School of Life Sciences, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland.,Department of Neurology, Geneva University Hospitals, Geneva, Switzerland
| | - Jane Elizabeth Aspell
- Laboratory of Cognitive Neuroscience, Brain-Mind Institute, School of Life Sciences, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland.,School of Psychology and Sport Science, Anglia Ruskin University, Cambridge, United Kingdom
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34
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Abstract
If somebody gazes at your left eye, you perceive them as looking straight at you. They switch their gaze with a single saccade to your right eye. You see their eyes move, yet they paradoxically end up still looking straight at you. Comparable paradoxical effects can arise when you view your own selfie image on a phone screen-but not when you look in a mirror.
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35
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Waters F, Barnby JM, Blom JD. Hallucination, imagery, dreaming: reassembling stimulus-independent perceptions based on Edmund Parish's classic misperception framework. Philos Trans R Soc Lond B Biol Sci 2020; 376:20190701. [PMID: 33308065 DOI: 10.1098/rstb.2019.0701] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
Within the broad field of human perception lies the category of stimulus-independent perceptions, which draws together experiences such as hallucinations, mental imagery and dreams. Traditional divisions between medical and psychological sciences have contributed to these experiences being investigated separately. This review aims to examine their similarities and differences at the levels of phenomenology and underlying brain function and thus reassemble them within a common framework. Using Edmund Parish's historical work as a guiding tool and the latest research findings in the cognitive, clinical and computational sciences, we consider how different perspectives may be reconciled and help generate novel hypotheses for future research. This article is part of the theme issue 'Offline perception: voluntary and spontaneous perceptual experiences without matching external stimulation'.
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Affiliation(s)
- Flavie Waters
- Clinical Research Centre, Graylands Hospital, North Metropolitan Health Service-Mental Health, Perth, Western Australia, Australia.,School of Psychological Sciences, University of Western Australia, Perth, Western Australia, Australia
| | - Joseph M Barnby
- Institute of Psychiatry, Psychology and Neuroscience, King's College, London, UK
| | - Jan Dirk Blom
- Faculty of Social and Behavioural Sciences, Leiden University, Leiden, The Netherlands.,Parnassia Psychiatric Institute, The Hague, The Netherlands.,Department of Psychiatry, University of Groningen, Groningen, The Netherlands
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36
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Luo J, Chen Z, Lu Y, Spillmann L, Andolina IM, Wang W. The Serpentine Illusion: A Visual Motion Illusion Induced by Phase-Shifted Line Gratings. Front Neurosci 2020; 14:612153. [PMID: 33424543 PMCID: PMC7793819 DOI: 10.3389/fnins.2020.612153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2020] [Accepted: 11/13/2020] [Indexed: 11/16/2022] Open
Abstract
In a pattern of horizontal lines containing ± 45° zigzagging phase-shifted strips, vivid illusory motion is perceived when the pattern is translated up or down at a moderate speed. Two forms of illusory motion are seen: [i] a motion "racing" along the diagonal interface between the strips and [ii] lateral (sideways) motion of the strip sections. We found the relative salience of these two illusory motions to be strongly influenced by the vertical spacing and length of the line gratings, and the period length of the zigzag strips. Both illusory motions are abolished when the abutting strips are interleaved, separated by a gap or when a real line is superimposed at the interface. Illusory motion is also severely weakened when equiluminant colored grating lines are used. Illusory motion perception is fully restored at < 20% luminance contrast. Using adaptation, we find that line-ends alone are insufficient for illusory motion perception, and that both physical carrier motion and line orientation are required. We finally test a classical spatiotemporal energy model of V1 cells that exhibit direction tuning changes that are consistent with the direction of illusory motion. Taking this data together, we constructed a new visual illusion and surmise its origin to interactions of spatial and temporal energy of the lines and line-ends preferentially driving the magnocellular pathway.
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Affiliation(s)
- Junxiang Luo
- Institute of Neuroscience, State Key Laboratory of Neuroscience, Key Laboratory of Primate Neurobiology, CAS Center for Excellence in Brain Science and Intelligence Technology, Chinese Academy of Sciences, Shanghai, China
- Shanghai Center for Brain Science and Brain-Inspired Intelligence Technology, Shanghai, China
| | - Zheyuan Chen
- Institute of Neuroscience, State Key Laboratory of Neuroscience, Key Laboratory of Primate Neurobiology, CAS Center for Excellence in Brain Science and Intelligence Technology, Chinese Academy of Sciences, Shanghai, China
- Shanghai Center for Brain Science and Brain-Inspired Intelligence Technology, Shanghai, China
| | - Yiliang Lu
- Institute of Neuroscience, State Key Laboratory of Neuroscience, Key Laboratory of Primate Neurobiology, CAS Center for Excellence in Brain Science and Intelligence Technology, Chinese Academy of Sciences, Shanghai, China
- Shanghai Center for Brain Science and Brain-Inspired Intelligence Technology, Shanghai, China
| | - Lothar Spillmann
- Department of Neurology, University of Freiburg, Freiburg im Breisgau, Germany
| | - Ian Max Andolina
- Institute of Neuroscience, State Key Laboratory of Neuroscience, Key Laboratory of Primate Neurobiology, CAS Center for Excellence in Brain Science and Intelligence Technology, Chinese Academy of Sciences, Shanghai, China
- Shanghai Center for Brain Science and Brain-Inspired Intelligence Technology, Shanghai, China
| | - Wei Wang
- Institute of Neuroscience, State Key Laboratory of Neuroscience, Key Laboratory of Primate Neurobiology, CAS Center for Excellence in Brain Science and Intelligence Technology, Chinese Academy of Sciences, Shanghai, China
- Shanghai Center for Brain Science and Brain-Inspired Intelligence Technology, Shanghai, China
- University of Chinese Academy of Sciences, Beijing, China
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Bekrater-Bodmann R, Azevedo RT, Ainley V, Tsakiris M. Interoceptive Awareness Is Negatively Related to the Exteroceptive Manipulation of Bodily Self-Location. Front Psychol 2020; 11:562016. [PMID: 33343444 PMCID: PMC7746809 DOI: 10.3389/fpsyg.2020.562016] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2020] [Accepted: 11/06/2020] [Indexed: 12/21/2022] Open
Abstract
The perception of being located within one's body (i.e., bodily self-location) is an essential feature of everyday self-experience. However, by manipulating exteroceptive input, healthy participants can easily be induced to perceive themselves as being spatially dislocated from their physical bodies. It has previously been suggested that interoception, i.e., the processing of inner physiological signals, contributes to the stability of body representations; however, this relationship has not previously been tested for different dimensions of interoception and bodily self-location. In the present study, using an advanced automatized setup, we systematically manipulated participants' perspective of their own body (first- vs third-person perspective) as well as the synchrony of visuotactile stimulation (synchronous vs asynchronous). The malleability of bodily self-location was assessed using a questionnaire targeting in-body and out-of-body experiences. Participants also performed a heartbeat discrimination task to assess their interoceptive accuracy (behavioral performance), interoceptive sensibility (confidence in their interoceptive abilities), and interoceptive awareness (meta-cognitive representation of interoceptive signals). Bodily self-location was significantly influenced by perspective, with third-person perspective being associated with stronger out-of-body experiences compared to first-person perspective. Furthermore, there was a significant perspective × stimulation interaction, with subsequent analyses showing that participants reported out-of-body experiences particularly under third-person perspective combined with synchronous visuotactile stimulation. Correlation and regression analyses revealed that meta-cognitive interoceptive awareness was specifically and negatively related to the exteroceptively mediated malleability of body experiences. These results indicate that the perception of the self being located within one's body relies on the interaction of exteroceptive input and higher-order interoceptive abilities. This has implications for theoretical considerations about the bodily self in health as well as for the understanding of disturbed bodily self-processing in clinical contexts.
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Affiliation(s)
- Robin Bekrater-Bodmann
- Department of Cognitive and Clinical Neuroscience, Central Institute of Mental Health, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany.,Department of Psychology, Royal Holloway, University of London, Egham, United Kingdom
| | - Ruben T Azevedo
- Department of Psychology, Royal Holloway, University of London, Egham, United Kingdom.,Department of Psychology, University of Kent, Canterbury, United Kingdom
| | - Vivien Ainley
- Department of Psychology, Royal Holloway, University of London, Egham, United Kingdom
| | - Manos Tsakiris
- Department of Psychology, Royal Holloway, University of London, Egham, United Kingdom.,Warburg Institute, School of Advanced Study, University of London, Bloomsbury, United Kingdom.,Department of Behavioural and Cognitive Sciences, Faculty of Humanities, Education and Social Sciences, University of Luxembourg, Luxembourg
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38
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Lõoke M, Marinelli L, Eatherington CJ, Agrillo C, Mongillo P. Do Domestic Dogs ( Canis lupus familiaris) Perceive Numerosity Illusions? Animals (Basel) 2020; 10:E2304. [PMID: 33291842 DOI: 10.3390/ani10122304] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2020] [Revised: 11/18/2020] [Accepted: 12/02/2020] [Indexed: 11/24/2022] Open
Abstract
Simple Summary Studying visual illusions in animals allows researchers to reveal similarities and differences between how human and non-human species perceive the world around them. Recently, investigations into dogs have found evidence for the differential perception of visual illusions, when compared with human observers. Here, we extended this line of investigation by testing dogs’ susceptibility to numerosity illusions. This type of illusion occurs when an individual under- or overestimates the number of objects presented in a visual scene owing to the spatial arrangement of the objects. In the current study, we observed the spontaneous likelihood for dogs to approach a larger quantity of food items. In Experiment 1, we first established whether dogs would try to maximize their food intake within the experimental context. Following this, Experiments 2 and 3 presented food items arranged so as to generate a well-known numerosity illusion—the Solitaire illusion. Overall, dogs were able to select the larger quantity of food (Experiment 1), but did not exhibit any evidence of a numerosity misperception in Experiments 2 and 3. Our results reinforce the idea that dogs’ representation of the world differs significantly from ours. Abstract Recent studies have showed that domestic dogs are only scantly susceptible to visual illusions, suggesting that the perceptual mechanisms might be different in humans and dogs. However, to date, none of these studies have utilized illusions that are linked to quantity discrimination. In the current study, we tested whether dogs are susceptible to a linear version of the Solitaire illusion, a robust numerosity illusion experienced by most humans. In the first experiment, we tested dogs’ ability to discriminate items in a 0.67 and 0.75 numerical ratio. The results showed that dogs’ quantity discrimination abilities fall in between these two ratios. In Experiment 2, we presented the dogs with the Solitaire illusion pattern using a spontaneous procedure. No evidence supporting any numerosity misperception was found. This conclusion was replicated in Experiment 3, where we manipulated dogs’ initial experience with the stimuli and their contrast with the background. The lack of dogs’ susceptibility to the Solitaire illusion suggests that numerical estimation of dogs is not influenced by the spatial arrangement of the items to be enumerated. In view of the existing evidence, the effect may be extended to dogs’ quantitative abilities at large.
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Kragting M, Schuiling SF, Voogt L, Pool-Goudzwaard AL, Coppieters MW. Using Visual Feedback Manipulation in Virtual Reality to Influence Pain-Free Range of Motion in People with Nonspecific Neck Pain. Pain Pract 2020; 21:428-437. [PMID: 33251721 PMCID: PMC8048536 DOI: 10.1111/papr.12971] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2020] [Revised: 11/04/2020] [Accepted: 11/23/2020] [Indexed: 11/29/2022]
Abstract
Background Based on associative learning theories it is hypothesized that pain might be a conditioned response. In people with musculoskeletal pain, the occurrence of movement‐induced pain might be a protective response, influenced by visual cues suggesting that the person is approaching a painful position. This study aimed to determine (1) whether the pain‐free range of motion (ROM) increased and decreased when visual feedback understated or overstated true rotation in people with neck pain and (2) whether this effect was more pronounced if pain was chronic. Method People with subacute and chronic nonspecific neck pain wore a VR‐headset and rotated their head to the left and right until the onset of pain. Visual feedback about the amount of movement was either equal, 20% less, or 20% greater than their actual rotation. Maximal pain‐free ROM was measured using the VR‐headset sensors. Data were analyzed using a mixed‐design ANOVA. Results There was no effect of visual feedback manipulation on pain‐free ROM (P = 0.13) and no interaction effect between the visual feedback condition and duration of pain (P = 0.86). Discussion The inability to influence pain‐free ROM by manipulating visual feedback in people with subacute or chronic neck pain does not support associative learning theories for the perception of neck pain.
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Affiliation(s)
- Maaike Kragting
- Department of Physical Therapy, Research Centre for Health Care Innovations, Rotterdam University of Applied Sciences, Rotterdam, The Netherlands.,Department of Human Movement Sciences, Faculty of Behavioural and Movement Sciences, Amsterdam Movement Sciences, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
| | - Stefan F Schuiling
- Department of Human Movement Sciences, Faculty of Behavioural and Movement Sciences, Amsterdam Movement Sciences, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
| | - Lennard Voogt
- Department of Physical Therapy, Research Centre for Health Care Innovations, Rotterdam University of Applied Sciences, Rotterdam, The Netherlands.,Pain in Motion Research Group, Department of Physiotherapy, Human Physiology and Anatomy, Faculty of Physical Education & Physiotherapy, Vrije Universiteit Brussel, Brussels, Belgium
| | - Annelies L Pool-Goudzwaard
- Department of Human Movement Sciences, Faculty of Behavioural and Movement Sciences, Amsterdam Movement Sciences, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
| | - Michel W Coppieters
- Department of Human Movement Sciences, Faculty of Behavioural and Movement Sciences, Amsterdam Movement Sciences, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands.,Menzies Health Institute Queensland, Griffith University, Brisbane and Gold Coast, Queensland, Australia
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Kaneko S. Lightness in a Flash: Effect of Exposure Time on Lightness Perception. Iperception 2020; 11:2041669520983830. [PMID: 33489078 PMCID: PMC7768315 DOI: 10.1177/2041669520983830] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2020] [Accepted: 12/05/2020] [Indexed: 11/17/2022] Open
Abstract
A gray target can appear lighter or darker depending on its surrounding spatial context. We examined the effect of exposure time on three such examples (simultaneous lightness contrast, dungeon illusion, and the two-room arrangement), finding very different results with exposure time as brief as 15 ms: the simultaneous lightness contrast was much stronger, the effect of the dungeon illusion was reversed, and the lightness difference between the two isoluminant patches in the two-room arrangement disappeared. These suggest that local luminance ratios dominate lightness perception in a brief flash.
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Affiliation(s)
- Sae Kaneko
- Sae Kaneko, Tohoku University – Katahira Campus 2-1-1 Katahira, Aoba-ku, Sendai Sendai, Miyagi 980-8577, Japan.
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41
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Hirakawa Y, Imai R, Shigetoh H, Morioka S. Intervention Using Body Shadow to Evoke Loading Imagery in a Patient with Complex Regional Pain Syndrome in the Foot: A Case Report. Brain Sci 2020; 10:brainsci10100718. [PMID: 33050227 PMCID: PMC7600743 DOI: 10.3390/brainsci10100718] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2020] [Revised: 10/05/2020] [Accepted: 10/06/2020] [Indexed: 11/30/2022] Open
Abstract
We present the case of a female patient who developed complex regional pain syndrome (CRPS) after a right-foot injury. The patient had pain from the right knee to the toes and showed severe disgust at the appearance of the affected limb. Consequently, the affected limb was not fully loaded, and the patient had difficulty walking. General interventions, such as mirror therapy, were attempted, but the effect was limited. We hypothesized that this was due to the disgust toward the affected limb, and we implemented a body-shadow intervention that we developed. This reduced the disgust for the affected limb and improved pain, but neither changed the anticipated pain of loading the affected limb nor improved the patient’s walking ability. The reason for this was considered to be that the previous interventions using the body shadow utilized the third-person perspective, denoting that the image of the load sensation on the sole of the foot during walking was insufficient; therefore, we attempted a first-person body-shadow intervention. The results showed improvement in the patient’s walking ability. In CRPS of the foot, it is important to use interventions that evoke images of loading without causing anticipatory pain, pointing to the effectiveness of body-shadow interventions.
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Affiliation(s)
- Yoshiyuki Hirakawa
- Department of Rehabilitation, Fukuoka Rehabilitation Hospital, Fukuoka City, Fukuoka 819-8551, Japan
- Correspondence: ; Tel.: +81-(092)-812-1555
| | - Ryota Imai
- School of Rehabilitation Osaka Kawasaki Rehabilitation University, Kaizuka City, Osaka 597-0104, Japan;
| | - Hayato Shigetoh
- Miura Internal Medicine Michiko Pediatrics Clinic, Kagawa 763-0082, Japan;
- Department of Neurorehabilitation, Graduate School of Health Sciences, Kio University, Nara City, Nara 635-0832, Japan;
| | - Shu Morioka
- Department of Neurorehabilitation, Graduate School of Health Sciences, Kio University, Nara City, Nara 635-0832, Japan;
- Neurorehabilitation Research Centre, Kio University, Nara City, Nara 635-0832, Japan
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42
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Vetik S, Tulver K, Lints D, Bachmann T. Among the Two Kinds of Metacognitive Evaluation, Only One Is Predictive of Illusory Object Perception. Perception 2020; 49:1043-1056. [PMID: 32903160 DOI: 10.1177/0301006620954322] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
The relationship between expectation-induced hallucination proneness and self-confidence in performance was studied in a visual perception task. Participants were prompted either to recognize briefly shown faces as male or female or to rate the subjective vividness of a square surrounding the face. Importantly, in a few critical trials, the square was absent. Upon completion, participants rated their performance in the face recognition task; they were also asked whether they were sure that their estimation was correct. Out of 35 participants, 33 "hallucinated" on at least one trial, rating the square as visible when it was actually absent. Negative correlation between hallucination proneness and self-confidence in performance (metacognitive rating) was found: The more hallucinations a participant experienced, the less confident he/she was in his/her performance in the face recognition task. Most subjects underestimated their performance; higher ratings were also more accurate. Thus, higher hallucination proneness was associated with more inaccurate ratings of one's own perception. However, confidence in self-ratings as measured by the second follow-up question was unrelated to both, hallucination proneness and self-confidence in performance, supporting the view that there is no unitary mechanism of metacognitive evaluations and extending this view to the domain of visual hallucinatory perception.
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Bach M, Atala-Gérard L. The Rotating Snakes Illusion Is a Straightforward Consequence of Nonlinearity in Arrays of Standard Motion Detectors. Iperception 2020; 11:2041669520958025. [PMID: 33149875 PMCID: PMC7585899 DOI: 10.1177/2041669520958025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Accepted: 08/17/2020] [Indexed: 11/29/2022] Open
Abstract
The Rotating Snakes illusion is a motion illusion based on repeating, asymmetric luminance patterns. Recently, we found certain gray-value conditions where a weak illusory motion occurs in the opposite direction. Of the four models for explaining the illusion, one also explains the unexpected perceived opposite direction.We here present a simple new model, without free parameters, based on an array of standard correlation-type motion detectors with a subsequent nonlinearity (e.g., saturation) before summing the detector outputs. The model predicts (a) the pattern-appearance motion illusion for steady fixation, (b) an illusion under the real-world situation of saccades across or near the pattern (pattern shift), (c) a relative maximum of illusory motion for the same gray values where it is found psychophysically, and (d) the opposite illusion for certain luminance values. We submit that the new model's sparseness of assumptions justifies adding a fifth model to explain this illusion.
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Affiliation(s)
- Michael Bach
- Eye Center, Medical Center – University of Freiburg, Faculty of Medicine, University of Freiburg, Germany
| | - Lea Atala-Gérard
- Eye Center, Medical Center – University of Freiburg, Faculty of Medicine, University of Freiburg, Germany
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44
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Clerici CA, Pagani Bagliacca E, Veneroni L, Podda M, Silva M, Gasparini P, Luksch R, Terenziani M, Casanova M, Spreafico F, Meazza C, Biassoni V, Schiavello E, Chiaravalli S, Proserpio T, Massimino M, Ferrari A. Adolescents with Terminal Cancer: Making Good Use of Illusions. J Adolesc Young Adult Oncol 2020; 9:683-686. [PMID: 32716666 DOI: 10.1089/jayao.2020.0069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
The terminal stage of disease in teenagers is extremely complex to manage. In this study, we share some stories of terminally ill adolescent patients who made use of illusion as a way to overcome their anguish in their final stages of illness. These experiences show how young patients can cope better with terminal illness by resorting to a nonrational and fictional dimension that can serve them as a psychological compromise, helping them tolerate their real everyday life by suspending their critical senses for a while. Illusions can serve as a resource for young patients and a potentially useful tool for medical professionals.
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Affiliation(s)
- Carlo Alfredo Clerici
- Department of Oncology and Hemato-Oncology, University of Milan, Milan, Italy.,Clinical Psychology Unit, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy
| | | | - Laura Veneroni
- Pediatric Oncology Unit, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy
| | - Marta Podda
- Pediatric Oncology Unit, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy
| | - Matteo Silva
- Pediatric Oncology Unit, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy
| | - Patrizia Gasparini
- Tumor Genomics Unit, and Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy
| | - Roberto Luksch
- Pediatric Oncology Unit, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy
| | - Monica Terenziani
- Pediatric Oncology Unit, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy
| | - Michela Casanova
- Pediatric Oncology Unit, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy
| | - Filippo Spreafico
- Pediatric Oncology Unit, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy
| | - Cristina Meazza
- Pediatric Oncology Unit, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy
| | - Veronica Biassoni
- Pediatric Oncology Unit, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy
| | - Elisabetta Schiavello
- Pediatric Oncology Unit, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy
| | - Stefano Chiaravalli
- Pediatric Oncology Unit, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy
| | - Tullio Proserpio
- Pastoral Care Unit, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy
| | - Maura Massimino
- Pediatric Oncology Unit, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy
| | - Andrea Ferrari
- Pediatric Oncology Unit, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy
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Zhaoping L. The Flip Tilt Illusion: Visible in Peripheral Vision as Predicted by the Central-Peripheral Dichotomy. Iperception 2020; 11:2041669520938408. [PMID: 32782769 PMCID: PMC7401056 DOI: 10.1177/2041669520938408] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2020] [Accepted: 06/10/2020] [Indexed: 11/16/2022] Open
Abstract
Consider a gray field comprising pairs of vertically aligned dots; in each pair, one dot is white the other black. When viewed in a peripheral visual field, these pairs appear horizontally aligned. By the Central-Peripheral Dichotomy, this flip tilt illusion arises because top-down feedback from higher to lower visual cortical areas is too weak or absent in the periphery to veto confounded feedforward signals from the primary visual cortex (V1). The white and black dots in each pair activate, respectively, on and off subfields of V1 neural receptive fields. However, the sub-fields' orientations, and the preferred orientations, of the most activated neurons are orthogonal to the dot alignment. Hence, V1 reports the flip tilt to higher visual areas. Top-down feedback vetoes such misleading reports, but only in the central visual field.
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Affiliation(s)
- Li Zhaoping
- Max Planck Institute for Biological Cybernetics, University of Tübingen
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46
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Abstract
Mating signals have evolved to attract target receivers, even to the point of exploiting receivers through perceptual manipulation. Signals, however, can also expose signalers to nontarget receivers, including predators and parasites, and thus have also evolved to decrease enemy attraction. Here we show that male tree frogs (Smilisca sila) reduce their attractiveness to eavesdropping enemies (bats and midges) by overlapping their calls at near-perfect synchrony with the calls of neighboring conspecifics. By producing calls that closely follow those of other males, synchronizing S. sila take advantage of an auditory illusion where enemies are more attracted to the leading call. Female S. sila, however, are less susceptible to this illusion. Thus, synchronization among signaling males can result in acoustic crypsis from predators without affecting female attraction. Given the widespread use of conspicuous mating signals and eavesdropping enemies, perceptual exploitation of eavesdroppers is likely a common driver of signal evolution.
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47
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Anstis S. Retinal Periphery Is Insensitive to Sudden Transient Motion. Iperception 2020; 11:2041669520937029. [PMID: 32874528 PMCID: PMC7433379 DOI: 10.1177/2041669520937029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2020] [Accepted: 06/03/2020] [Indexed: 11/17/2022] Open
Abstract
Peripherally viewed targets moved around against a background of random dynamic noise. Slow movements were visible, fast movements were not. Thus, a target that repetitively drifted to the right and snapped back appeared to drift endlessly to the right with no visible snapbacks.
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Affiliation(s)
- Stuart Anstis
- Department of Psychology, University of California
San Diego
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48
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Abstract
The initial objective of this study was to determine if activation of the sweet taste receptor TAS1R2/TAS1R3 is necessary for perception of sweet thermal taste (swTT). Our approach was to inhibit the receptor with the inverse agonist lactisole using a temperature-controlled flow gustometer. Because all prior studies of thermal taste (TT) used metal thermodes to heat the tongue tip, we first investigated whether it could be generated in heated water. Experiment 1 showed that sweetness could be evoked when deionized water was heated from 20 to 35 °C, and testing with static temperatures between 20 and 35 °C demonstrated the importance of heating from a cool temperature. As in previous studies, thermal sweetness was reported by only a subset of participants, and replicate measurements found variability in reports of sweetness across trials and between sessions. Experiment 2 then showed that exposure to 8 mM lactisole blocked perception of swTT. Confirmation of the involvement of TAS1R2/TAS1R3 led to an investigation of possible sensory and cognitive interactions between thermal and chemical sweetness. Using sucrose as a sweet stimulus and quinine as a nonsweet control, we found that dynamic heating capable of producing thermal sweetness did not increase the sweetness of sucrose compared with static heating at 35 °C. However, swTT was disrupted if trials containing sucrose (but not quinine) were interspersed among heating-only trials. These findings provide new information relevant to understanding the perceptual processes and receptor mechanisms of swTT, as well as the heat sensitivity of sweet taste in general.
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Affiliation(s)
| | - Barry G Green
- The John B. Pierce Laboratory, New Haven, CT, USA
- Yale School of Medicine, Department of Surgery (Otolaryngology), New Haven, CT, USA
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49
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Pak A, Ryu E, Li C, Chubykin AA. Top-Down Feedback Controls the Cortical Representation of Illusory Contours in Mouse Primary Visual Cortex. J Neurosci 2020; 40:648-60. [PMID: 31792152 DOI: 10.1523/JNEUROSCI.1998-19.2019] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2019] [Revised: 10/29/2019] [Accepted: 11/15/2019] [Indexed: 01/01/2023] Open
Abstract
Visual systems have evolved to recognize and extract features from complex scenes using limited sensory information. Contour perception is essential to this process and can occur despite breaks in the continuity of neighboring features. Such robustness of the animal visual system to degraded or occluded shapes may also give rise to an interesting phenomenon of optical illusions. These illusions provide a great opportunity to decipher neural computations underlying contour integration and object detection. Kanizsa illusory contours have been shown to evoke responses in the early visual cortex despite the lack of direct receptive field activation. Recurrent processing between visual areas has been proposed to be involved in this process. However, it is unclear whether higher visual areas directly contribute to the generation of illusory responses in the early visual cortex. Using behavior, in vivo electrophysiology, and optogenetics, we first show that the primary visual cortex (V1) of male mice responds to Kanizsa illusory contours. Responses to Kanizsa illusions emerge later than the responses to the contrast-defined real contours in V1. Second, we demonstrate that illusory responses are orientation-selective. Finally, we show that top-down feedback controls the neural correlates of illusory contour perception in V1. Our results suggest that higher-order visual areas may fill in the missing information in the early visual cortex necessary for illusory contour perception.SIGNIFICANCE STATEMENT Perception of the Kanizsa illusory contours is impaired in neurodevelopmental disorders such as schizophrenia, autism, and Williams syndrome. However, the mechanism of the illusory contour perception is poorly understood. Here we describe the behavioral and neural correlates of Kanizsa illusory contours perception in mice, a genetically tractable model system. We show that top-down feedback controls the neural responses to Kanizsa illusion in V1. To our knowledge, this is the first description of the neural correlates of the Kanizsa illusion in mice and the first causal demonstration of their regulation by top-down feedback.
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Dave S, Weintraub D, Aarsland D, Ffytche DH. Drug and Disease Effects in Parkinson's Psychosis: Revisiting the Role of Dopamine. Mov Disord Clin Pract 2019; 7:32-36. [PMID: 31970209 PMCID: PMC6962668 DOI: 10.1002/mdc3.12851] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2019] [Accepted: 09/14/2019] [Indexed: 11/06/2022] Open
Abstract
Background Levodopa and dopamine agonists (dopamine replacement therapy [DRT]) are implicated in Parkinson's disease psychosis (PDP), but the relationship between DRT and neurotransmitter dysfunction inherent to PD remains unclear. Objectives To examine the relationship between baseline striatal dopamine transporter (DAT) binding in drug‐naïve idiopathic PD, introduction of DRT, or dose change and incident early‐onset PDP. Methods Baseline DAT binding was compared between patients with and without incident psychosis (defined here as hallucinations or delusions), controlling for age, sex, baseline cognition, and prospective DRT in the Parkinson's Progression Markers Initiative cohort. Incident illusions were not considered psychosis symptoms. Results Of 386 patients, 30 (8%) developed PDP (predominantly hallucinations, mean onset 42 months) and 355 (92%) had either no PDP symptoms (mean follow‐up 64 months) or reported illusions only (111/355, 31%). Incident PDP was associated with reduced baseline striatal DAT binding, controlling for confounders (F1,377 = 10.9; P = 0.001), but not with a specific DRT regime. A total of 6 patients developed PDP when DRT free. There was no suggestion that PDP onset was coincident with starting levodopa or levodopa dose increase. Incident illusions were not associated with reduced DAT binding. Conclusion The findings highlight the role of disease‐related dopamine mechanisms in the pathophysiology of hallucinations in Parkinson's disease alongside medication. It remains to be determined how dopamine mechanisms, medication, and other neurotransmitter systems implicated in PDP interact.
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Affiliation(s)
- Sonali Dave
- King's College London Parkinson's Cognition Group (KCL-PARCOG) Group Institute of Psychiatry, Psychology & Neuroscience, King's College London London United Kingdom.,Department of Old Age Psychiatry Institute of Psychiatry, Psychology & Neuroscience, King's College London London United Kingdom
| | - Daniel Weintraub
- King's College London Parkinson's Cognition Group (KCL-PARCOG) Group Institute of Psychiatry, Psychology & Neuroscience, King's College London London United Kingdom.,Departments of Psychiatry and Neurology Perelman School of Medicine at the University of Pennsylvania Philadelphia Pennsylvania USA.,Parkinson's Disease and Mental Illness Research Education and Clinical Centres, Philadelphia Veterans Affairs Medical Centre Philadelphia Pennsylvania USA
| | - Dag Aarsland
- King's College London Parkinson's Cognition Group (KCL-PARCOG) Group Institute of Psychiatry, Psychology & Neuroscience, King's College London London United Kingdom.,Department of Old Age Psychiatry Institute of Psychiatry, Psychology & Neuroscience, King's College London London United Kingdom.,Centre of Age-Related Medicine Stavanger University Hospital Stavanger Norway
| | - Dominic H Ffytche
- King's College London Parkinson's Cognition Group (KCL-PARCOG) Group Institute of Psychiatry, Psychology & Neuroscience, King's College London London United Kingdom.,Department of Old Age Psychiatry Institute of Psychiatry, Psychology & Neuroscience, King's College London London United Kingdom
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