18 papers · ranked by Valyu relevance
W. Patrick Hooper, Pavel Javornik
We study geodesics on the Necker cube surface, N, an infinite periodic Euclidean cone surface that is homeomorphic to the plane and is tiled by squares meeting three or six to a vertex. We ask: When does a geodesic on the surface close? When does a geodesic drift away periodically? We show that both questions can be…
Alexander E. Hramov, Vladimir A. Maksimenko, Svetlana V. Pchelintseva, Anastasiya E. Runnova + 5 more
'Anastasiya E. Runnova' 'Vadim V. Grubov' 'Vyacheslav Yu. Musatov' 'Maksim O. Zhuravlev' 'Alexey A. Koronovskii' 'Alexander N. Pisarchik'] In order to classify different human brain states related to visual perception of ambiguous images, we use an artificial neural network (ANN) to analyze multichannel EEG. The…
Authors not listed
The Penrose triangle, staircase, and related "impossible objects" have long been understood as related to first cohomology H 1 : the obstruction to extending locally consistent interpretations around a loop. This paper develops a cohomological hierarchy for a class of visual paradoxes. Restricting to systems built from…
Allan C. Dobbins, Jon K. Grossmann, Sheng He
Visual scene interpretation depends on assumptions based on the statistical regularities of the world. People have some preference for seeing ambiguously oriented objects (Necker cubes) as if tilted down or viewed from above. This bias is a near certainty in the first instant (∼1 s) of viewing and declines over the…
B. M. van Dalen
Despite a staggering technical progress in echocardiography, in daily clinical practice assessment of left ventricular (LV) ejection fraction (EF) is still often done in a rather inaccurate two-dimensional (2D) manner. Real-time three-dimensional echocardiography (RT3DE) provides a more representative realistic view of…
Alexander Kuc, Vladimir Maksimenko, Andrey Savosenkov, Nikita Grigorev + 5 more
'Nikita Grigorev' 'Vadim Grubov' 'Artem Badarin' 'Victor Kazantsev' 'Susanna Gordleeva' 'Alexander Hramov'] When viewing a completely ambiguous image, different interpretations can switch involuntarily due to internal top-down processing. In the case of the Necker cube, an entirely ambiguous stimulus, observers often…
Leyla Loued-Khenissi, Adrien Pfeuffer, Wolfgang Einhäuser, Kerstin Preuschoff
The process of inference is theorized to underlie neural processes, including value-based decision-making and perception. Value-based decision-making commonly involves deliberation, a time-consuming process that requires conscious consideration of decision variables. Perception, by contrast, is thought to be automatic…
Ivan S. Maksymov
Ambiguous optical illusions have been a paradigmatic object of fascination, research and inspiration in arts, psychology and video games. However, accurate computational models of perception of ambiguous figures have been elusive. In this paper, we design and train a deep neural network model to simulate the human's…
Henrikas Vaitkevicius, Vygandas Vanagas, Alvydas Soliunas, Algimantas Svegzda + 4 more
'Algimantas Svegzda' 'Remigijus Bliumas' 'Rytis Stanikunas' 'Janus J. Kulikowski' 'Stephen Macknik'] Many experiments have demonstrated that the rhythms in the brain influence the initial perceptual information processing. We investigated whether the alternation rate of the perception of a Necker cube depends on the…
Mareike Wilson, Lukas Hecker, Ellen Joos, Ad Aertsen + 2 more
During observation of the ambiguous Necker cube, our perception suddenly reverses between two about equally possible 3D interpretations. During passive observation, perceptual reversals seem to be sudden and spontaneous. A number of theoretical approaches postulate destabilization of neural representations as a…
Vladimir A. Maksimenko, Anastasia E. Runnova, Maksim O. Zhuravlev, Vladimir V. Makarov + 6 more
'Vladimir V. Makarov' 'Vladimir Nedayvozov' 'Vadim V. Grubov' 'Svetlana V. Pchelintceva' 'Alexander E. Hramov' 'Alexander N. Pisarchik' 'Yih-Kuen Jan'] The influence of motivation and alertness on brain activity associated with visual perception was studied experimentally using the Necker cube, which ambiguity was…
Takashi J. Ozaki, Naoyuki Sato, Keiichi Kitajo, Yoshiaki Someya + 4 more
'Kimitaka Anami' 'Hiroaki Mizuhara' 'Seiji Ogawa' 'Yoko Yamaguchi'] An ambiguous figure such as the Necker cube causes spontaneous perceptual switching (SPS). The mechanism of SPS in multistable perception has not yet been determined. Although early psychological studies suggested that SPS may be caused by fatigue or…
Stefano Bonzio, Andrea Loi, Luisa Peruzzi
Erno Rubik invented in 1974 the most famous and appreciated puzzle game of all times that still goes under his name: the Rubik's Cube. In 1981, the Rubik's Revenge appeared on the market, meant to be a more difficult puzzle with respect to the original. In a sort of race to make the challenge harder and harder, a few…
Hui Fang, Hui Liu, Hui Wang, Wenqi Qiu + 4 more
The diversified self-assembly in water is a versatile and significant phenomenon with far-reaching implications in materials science, medicine, biotechnology, and various other fields. Through subtle tailoring in the amphipathic molecular structures, two completely different self-assembly behaviors in water were…
Maki Shigyo, Kaori Tamura, Tsuyoshi Okamoto
Computerized and non-computerized games are used in training designed to improve cognitive function. However, it is unclear which properties of the games influence the transfer of cognitive performance. This study aimed to examine the expandability of this transfer according to the properties of training tools. We…
Isabel Koh, Masaya Hagiwara
Advancements in organoid culture methods have led to a widespread availability of various in vitro mini-organs that mimic native tissues in many ways. Yet, the bottleneck remains to generate complex organoids with body axis patterning, as well as keeping the orientation of organoid samples during post-experiment…
Péter Burcsi
In this paper we give a mathematical model for a game that we call picture cube puzzle and investigate its properties. The central question is the number of moves required to solve the puzzle. A mathematical discussion is followed by the description of computational results. We also give a generalization of the problem…
Remco R. Bouckaert
Variational Bayesian methods work well when the distribution of interest can be represented by a Euclidian space using a bijective transformation between phylogenies and their representation. Until now, full phylogenetic inference has been hampered by the lack of such transformation. Here, we study the distance matrix…