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Saudi Journal of Gastroenterology :... 2019
Topics: Colonic Polyps; Endoscopy; Humans; Image Enhancement; Optical Illusions
PubMed: 30900612
DOI: 10.4103/sjg.SJG_159_19 -
Perception Sep 2023A novel geometrical optical illusion is reported in this article: the horizontal distances of the contextual structures distort the perceived vertical positions of...
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.
Topics: Humans; Orientation; Optical Illusions
PubMed: 37427447
DOI: 10.1177/03010066231186557 -
Oral Surgery, Oral Medicine, and Oral... Jun 1976
Topics: Adolescent; Diagnostic Errors; Humans; Male; Molar; Optical Illusions; Radiography
PubMed: 1063987
DOI: 10.1016/0030-4220(76)90197-3 -
Neuron Nov 2020Direction-selective (DS) neurons compute the direction of motion in a visual scene. Brain-wide imaging in larval zebrafish has revealed hundreds of DS neurons scattered...
Direction-selective (DS) neurons compute the direction of motion in a visual scene. Brain-wide imaging in larval zebrafish has revealed hundreds of DS neurons scattered throughout the brain. However, the exact population that causally drives motion-dependent behaviors-e.g., compensatory eye and body movements-remains largely unknown. To identify the behaviorally relevant population of DS neurons, here we employ the motion aftereffect (MAE), which causes the well-known "waterfall illusion." Together with region-specific optogenetic manipulations and cellular-resolution functional imaging, we found that MAE-responsive neurons represent merely a fraction of the entire population of DS cells in larval zebrafish. They are spatially clustered in a nucleus in the ventral lateral pretectal area and are necessary and sufficient to steer the entire cycle of optokinetic eye movements. Thus, our illusion-based behavioral paradigm, combined with optical imaging and optogenetics, identified key circuit elements of global motion processing in the vertebrate brain.
Topics: Afterimage; Animals; Animals, Genetically Modified; Eye Movements; Motion Perception; Neuroimaging; Optical Illusions; Optogenetics; Photic Stimulation; Pretectal Region; Zebrafish
PubMed: 32966764
DOI: 10.1016/j.neuron.2020.08.027 -
Perception 1978A new optical-geometrical illusion is described. The parallelism of short rows of dots is affected by some unknown factor, so that the rows appear as pivoting on their...
A new optical-geometrical illusion is described. The parallelism of short rows of dots is affected by some unknown factor, so that the rows appear as pivoting on their middle point. Some explanations of the illusion are considered, but with no success.
Topics: Humans; Illusions; Optical Illusions; Visual Perception
PubMed: 652482
DOI: 10.1068/p070225 -
Journal of Electrocardiology 2019
Topics: Artifacts; Brugada Syndrome; Electrocardiography; Head Protective Devices; Humans; Myocardial Infarction; Optical Illusions
PubMed: 31203175
DOI: 10.1016/j.jelectrocard.2019.06.002 -
JAMA Oncology Mar 2023
Clinical Trial
Topics: Humans; Male; Optical Illusions; Pelvis; Prostate; Prostatic Neoplasms; Radiosurgery; Radiotherapy Dosage
PubMed: 36633862
DOI: 10.1001/jamaoncol.2022.6334 -
Acta Neurobiologiae Experimentalis 2019Perceptual estimates of spatial dimensions of visual objects depend on their shape and surface attributes. The present psychophysical study emphasizes two main...
Perceptual estimates of spatial dimensions of visual objects depend on their shape and surface attributes. The present psychophysical study emphasizes two main contributors to the Oppel‑Kundt illusion: the outline of the filled space and the mode of filling. In past experiments, both factors have been considered significant. Our experiments were performed by using combined stimuli of the Oppel‑Kundt figures and supplementary objects situated within the empty intervals of the figures. Line segments, empty and filled rectangles, blurred contours, and grey and color images were used for the supplementary stimuli role. The experimental data demonstrated an innate property of the objects to balance the illusion of distance if they were placed within the Oppel‑Kundt figure and to create an illusion of extent when compared with an empty space interval. Both the balance magnitude and the induced illusion strength varied depending on the objects' spatial structure. The supplementary objects showed a tendency to differ from each other by their functional capacity and were ranked from lowest to highest: a line segment, a solid bar with a blurred outline, a contour of a rectangle, a solid fill rectangle, greyscale patterns, and color pictures. The experimental findings provided support for an explanation of the Oppel‑Kundt illusion in terms of the spatial‑temporal summation of excitations representing the object outline and surface attributes at the lower cortical levels of the visual system. Along with the facts already established in current literature, the experimental data gave rise to the assumption that any visual object could appear larger than its occupied area, and that the Oppel‑Kundt illusion could become a separate case in the common sensory phenomenon of object size illusion.
Topics: Adult; Female; Form Perception; Humans; Male; Middle Aged; Optical Illusions; Photic Stimulation; Size Perception; Space Perception; Young Adult
PubMed: 31885396
DOI: No ID Found -
Analytical Chemistry Dec 2022Although light-sheet-based super-resolution microscopy is an excellent detection technique for biological samples because of minimal photodamage, uneven light paths due...
Although light-sheet-based super-resolution microscopy is an excellent detection technique for biological samples because of minimal photodamage, uneven light paths due to solid-angle illumination limits it, resulting in an optical illusion. Furthermore, the optical illusion limits the observations of individual molecules in diffraction. In this study, a four-dimensional cuboid multiangle illumination-based light-sheet super-resolution (4D CMLS) imaging system was developed to minimize optical illusions in cells. The lab-built 4D CMLS imaging system was integrated with total internal reflection fluorescence and a differential interference contrast microscope. A specially designed rotatable cuboid prism simply overcame the optical illusion by rotating a specimen on the prism to change the direction of light coming from an illumination lens. 4D CMLS reconstructed images of nanoparticles of different sizes were acquired in multi-illumination angles of 0°, 90°, 180°, and 270°. Additionally, a 4D multiangle illumination-based algorithm was created to select the optimal illumination angle by combining three-dimensional super-resolution imaging with multiangle observation, even in the presence of obstacles. The 4D CMLS imaging method demonstrates the in-depth 4D observation of samples at an optimum angle that can be used in various applications, such as single-molecule and subcellular organelle observations in single cells at subdiffraction limit resolutions that describe the scenario of nature.
Topics: Optical Illusions; Lighting; Microscopy; Imaging, Three-Dimensional; Nanoparticles
PubMed: 36509731
DOI: 10.1021/acs.analchem.2c03729 -
Journal of the History of Dentistry 2023Demonstrable feats of strength and valor using the teeth are found throughout many aspects of newsworthy items and social encounters in history past. Likewise,...
Demonstrable feats of strength and valor using the teeth are found throughout many aspects of newsworthy items and social encounters in history past. Likewise, promotional opportunities relative to the dentition were also common. This article addresses many of these sensationalistic scenarios that were found on postcards related to dentistry in the early 1900s.
Topics: Optical Illusions; Head; Dentistry
PubMed: 38039115
DOI: 10.58929/jhd.2023.071.03.223