Rayism

Author(s):  
Anthony Parton

An abstract and non-objective style of painting, Rayism ("Luchizm") was pioneered by the Russian artist Mikhail Larionov in early 1912. The style represented the first theoretically coherent and practically consistent response on the part of the Russian avant-garde to the challenges of French Cubism and Italian Futurism. In divorcing art from figuration and in its emphasis on the purely formal qualities of painting, Rayism prepared the way for the development of both Suprematism and Constructivism. Larionov’s innovative style was practiced chiefly by those artists in his immediate orbit: painters such as Natalia Goncharova, Alexander Shevchenko, and Mikhail Le-Dantiyu, who belonged to the Donkey’s Tail and Target group. While Rayism had a limited life-span in Russia, being overtaken by Suprematism in 1915, Larionov and Goncharova continued to practice the style throughout their careers, executing Rayist paintings right up to the 1950s. In its earliest phase, known as "Realistic Rayism" ("Realistichesky luchizm"), the style proceeded from Larionov’s interest in optics and Impressionist color theory and specifically from the idea that the color, contour, and form of our world is defined by rays of light reflected from all material objects. According to Larionov’s booklet Rayism (Luchizm) of 1912, his initial aim was to explore the nature of visual perception as it exists before the brain converts what we see into a comprehensible form.

1999 ◽  
Vol 19 (6) ◽  
pp. 4093-4100 ◽  
Author(s):  
Odile Begel ◽  
Jocelyne Boulay ◽  
Beatrice Albert ◽  
Eric Dufour ◽  
Annie Sainsard-Chanet

ABSTRACT Podospora anserina is a filamentous fungus with a limited life span. It expresses a degenerative syndrome called senescence, which is always associated with the accumulation of circular molecules (senDNAs) containing specific regions of the mitochondrial chromosome. A mobile group II intron (α) has been thought to play a prominent role in this syndrome. Intron α is the first intron of the cytochrome c oxidase subunit I gene (COX1). Mitochondrial mutants that escape the senescence process are missing this intron, as well as the first exon of theCOX1 gene. We describe here the first mutant of P. anserina that has the α sequence precisely deleted and whose cytochrome c oxidase activity is identical to that of wild-type cells. The integration site of the intron is slightly modified, and this change prevents efficient homing of intron α. We show here that this mutant displays a senescence syndrome similar to that of the wild type and that its life span is increased about twofold. The introduction of a related group II intron into the mitochondrial genome of the mutant does not restore the wild-type life span. These data clearly demonstrate that intron α is not the specific senescence factor but rather an accelerator or amplifier of the senescence process. They emphasize the role that intron α plays in the instability of the mitochondrial chromosome and the link between this instability and longevity. Our results strongly support the idea that in Podospora, “immortality” can be acquired not by the absence of intron α but rather by the lack of active cytochromec oxidase.


Psychiatry ◽  
1961 ◽  
Vol 24 (4) ◽  
pp. 318-323 ◽  
Author(s):  
Lawrence LeShan ◽  
Eda LeShan
Keyword(s):  

2020 ◽  
Vol 8 (18) ◽  

In the transformation of the low-level, ambiguous retinal signal into a vivid and meaningful phenomenological experience, certain aspects are as essential as the input coming from the external environment. The semantic knowledge stored in memory, figure-background segmentation, grouping principles, and current mood and expectations of the person are equally important. Visual illusions, which might be described as the discrepancy between the objective properties of the external world and their subjective representations, is a common feature of the visual perception that provides meaningful insights with regards to the structure and function of the complex information processor in the brain. In this context, visual illusions are the end results of the optimization strategies that allow the effective use of limited neuronal and metabolic resources, and thus reflect the natural working principles while coping with these limitations, rather than restrictions inflicted upon the system. In this review, we present a compilation of illusions and summarize the key principles of visual perception on the basis of these visual phenomena. In the final section, we also discuss a number of recent topics within the context of Bayesian inference and psychopathology, illusions and alpha brain oscillations and time perception to describe the current directions in the field. Keywords Visual perception, visual illusions, visual system


2021 ◽  
Vol 1 (1) ◽  
pp. 25-40
Author(s):  
Neriman Aral

From the moment the child is born, learning becomes meaningful and it is interpreted as a result of the experiences first in the family and then in school. However, it is sometimes not possible to talk about the fact that learning takes place in all children although the process has taken place in this direction. Sometimes the individual differences that exist in children and the inability to get the necessary support in structuring their learning experiences can be effective in the failure of learning, while sometimes the type of congenital difficulty can be effective. One of these types of difficulty is a specific learning difficulty. It is not always possible for children with specific learning difficulties to learn, even if they do not have any mental problems. In this case, many factors can be effective, especially the problems that children experience in their visual perception can become effective. Since visual perception is the processing of symbols received from the environment in the brain, the problem that may be experienced in this process can also make it difficult to learn this situation. In line with these considerations, it is aimed to focus on the importance of visual perception in specific learning difficulties.


2020 ◽  
Vol 48 (9) ◽  
pp. 2323-2332 ◽  
Author(s):  
Wei Huang ◽  
Hongmei Yan ◽  
Chong Wang ◽  
Jiyi Li ◽  
Zhentao Zuo ◽  
...  

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