scholarly journals Commentary: Left hand, right hand and on the other hand

2011 ◽  
Vol 39 (6) ◽  
pp. 462-463
Author(s):  
Graham R. Parslow
Keyword(s):  
2018 ◽  
Vol 120 (2) ◽  
pp. 729-740 ◽  
Author(s):  
Elizabeth J. Woytowicz ◽  
Kelly P. Westlake ◽  
Jill Whitall ◽  
Robert L. Sainburg

Two contrasting views of handedness can be described as 1) complementary dominance, in which each hemisphere is specialized for different aspects of motor control, and 2) global dominance, in which the hemisphere contralateral to the dominant arm is specialized for all aspects of motor control. The present study sought to determine which motor lateralization hypothesis best predicts motor performance during common bilateral task of stabilizing an object (e.g., bread) with one hand while applying forces to the object (e.g., slicing) using the other hand. We designed an experimental equivalent of this task, performed in a virtual environment with the unseen arms supported by frictionless air-sleds. The hands were connected by a spring, and the task was to maintain the position of one hand while moving the other hand to a target. Thus the reaching hand was required to take account of the spring load to make smooth and accurate trajectories, while the stabilizer hand was required to impede the spring load to keep a constant position. Right-handed subjects performed two task sessions (right-hand reach and left-hand stabilize; left-hand reach and right-hand stabilize) with the order of the sessions counterbalanced between groups. Our results indicate a hand by task-component interaction such that the right hand showed straighter reaching performance whereas the left hand showed more stable holding performance. These findings provide support for the complementary dominance hypothesis and suggest that the specializations of each cerebral hemisphere for impedance and dynamic control mechanisms are expressed during bilateral interactive tasks. NEW & NOTEWORTHY We provide evidence for interlimb differences in bilateral coordination of reaching and stabilizing functions, demonstrating an advantage for the dominant and nondominant arms for distinct features of control. These results provide the first evidence for complementary specializations of each limb-hemisphere system for different aspects of control within the context of a complementary bilateral task.


2018 ◽  
Vol 83 (3) ◽  
pp. 1063-1090
Author(s):  
YORIYUKI YAMAGATA

AbstractThis article presents a proof that Buss’s $S_2^2$ can prove the consistency of a fragment of Cook and Urquhart’s PV from which induction has been removed but substitution has been retained. This result improves Beckmann’s result, which proves the consistency of such a system without substitution in bounded arithmetic $S_2^1$.Our proof relies on the notion of “computation” of the terms of PV. In our work, we first prove that, in the system under consideration, if an equation is proved and either its left- or right-hand side is computed, then there is a corresponding computation for its right- or left-hand side, respectively. By carefully computing the bound of the size of the computation, the proof of this theorem inside a bounded arithmetic is obtained, from which the consistency of the system is readily proven.This result apparently implies the separation of bounded arithmetic because Buss and Ignjatović stated that it is not possible to prove the consistency of a fragment of PV without induction but with substitution in Buss’s $S_2^1$. However, their proof actually shows that it is not possible to prove the consistency of the system, which is obtained by the addition of propositional logic and other axioms to a system such as ours. On the other hand, the system that we have considered is strictly equational, which is a property on which our proof relies.


1967 ◽  
Vol 87 ◽  
pp. 62-73 ◽  
Author(s):  
F. D. Harvey

In 1957 Mr Lobel published, in the twenty-fourth volume of the Oxyrhynchus Papyri, a large fragment of a commentary on the Spartan poet Alcman. It is the second column of this papyrus which I propose to discuss; lines 13 to 22 give us some information about the Spartan royal family, and lines 22 to 25 seem to be saying something about the Spartan tribal organisation. Unfortunately, however, much of the left-hand side of the column is missing at this point; and when, from line 22, we do at last have a few letters from the left-hand side, we are faced with a gap running up the right-hand side as well. Because of this, it will be necessary to spend some time in an attempt to discover what the papyrus said, what it might have said, and what it could not possibly have said. Until this is done, no historical conclusions can safely be drawn.Before starting on an examination of the text, however, it would be as well to state what can be known about the author of the commentary. We can be certain that he had the work of previous scholars before him. In line 4 he refers to Theon, the Augustan grammarian, and in line 5 to Tyrannion; there were two grammarians of that name, and we cannot tell which he means (Lobel 54). Furthermore, in line 28, τῶν λοιπῶν is best taken as meaning ‘the other commentators’ (see p. 70). Whether or not he was an intelligent man is a question on which it is better not to dogmatise. He is capable of interpretative remarks of dubious value (lines 9–13, with Lobel ad loc.). There is certainly a muddle in the third column, which may indicate stupidity on the part of the commentator, or carelessness on the part of the scribe. We should not assume too readily that what he says is the gospel truth about early Sparta. On the other hand, we should remember that he might be working from a reliable source.


ADDIN ◽  
2019 ◽  
Vol 13 (1) ◽  
pp. 109
Author(s):  
Fairuz Sabiq

The determination of the direction of the qibla at the Great Mosque that was inherited from the Islamic Kingdom of Java had executed by <em>waliyullah</em>. Through the folklore and history of the Land of Java or known as <em>a Babad</em>, those stories explained that <em>waliyullah</em> was the person who determining direction of Qibla by raising his right-hand and holding Masjidil Haram in Makkah. On the other hand, he was holding <em>mustoko</em> of the mosque. A line between his right and left-hand as a line of direction of the mosque’s Qibla. This kind of story was widespread in society as a myth. This myth was related to <em>karomah</em> (divine distinction) of <em>waliyullah</em>. Therefore, Qibla of the mosque could not be changeabled, eventhough, the qibla direction of Great Mosque is not unidirectional with direction of Masjidil Haram. People’s opinions said that Qibla direction of the mosque is right according to <em>jihatul Ka’bah</em>. This research is integrated with myth and astronomy. The results of this research are different from formerly perspectives. <em>Firstly</em>, <em>ulama</em> received the result of myth but they were not catching messages of the myth. <em>Ulama</em> were only understood of the explicit meanings of the myth but they were not understand of the implicit meanings of the myth. <em>Secondly</em>, Sunan Kalijaga had determined direction Qibla of the Mosque with his knowledge about <em>falak</em>, he was not doing it by only his <em>karomah </em>(divine distinction). <em>Thirdly</em>, the direction of the Qibla at the Great Mosque that was inherited from the Islamic Kingdom of Java was determined its Qibla direction by using ‘<em>ainul Ka’bah </em>method<em> </em>and not only by using <em>jihatul Ka’bah</em> method. The last, Java society has a feodalistic character.


Author(s):  
Cathy Curtis

In 1942, at age twenty, after a vision-impaired and rebellious childhood in Richmond, Virginia, Nell Blaine decamped for New York. Operations had corrected her eyesight, and she was newly aware of modern art, so different from the literal style of her youthful drawings. In Manhattan, she met rising young artists and poets. Her life was hectic, with raucous parties in her loft, lovers of both sexes, and freelance design jobs, including a stint at the Village Voice. Initially drawn to the rigorous formalism of Piet Mondrian, she received critical praise for her jazzy abstractions. During the 1950s, she began to paint interiors and landscapes. By 1959, when the Whitney Museum purchased one of her paintings, her career was firmly established. That year, she contracted a severe form of polio on a trip to Greece; suddenly, she was a paraplegic. Undaunted, she taught herself to paint in oil with her left hand, reserving her right hand for watercolors. In her postpolio work, she achieved a freer style, expressive of the joy she found in flowers and landscapes. Living half the year in Gloucester, Massachusetts, and the other half in New York, she took special delight in painting the views from her windows and from her country garden. Critics found her new style irresistible, and she had a loyal circle of collectors; still, she struggled to earn enough money to pay the aides who made her life possible. At her side for her final twenty-nine years was her lover, painter Carolyn Harris.


Tempo ◽  
1991 ◽  
pp. 18-23 ◽  
Author(s):  
Stephen Montague

In the early 1920s and 30s a strange electronic instrument found its way from Russia into some of the more fashionable ballrooms, night clubs, and concert halls in Europe and America. This exotic new invention, called the ‘theremin’ or ‘thereminvox’, caused a considerable stir. Part of the interest was its unusual sound (like a musical saw mated with a light soprano), but its most dramatic feature was that the performer never actually touched the instrument. He or she simply waved graceful hands near the two antennae (one set vertically, the other looped horizontally) to coax out seamless, melifluous melodies. The proximity of the right hand to the vertical antenna changed the ultrasonic electromagnetic field, thus changing the pitch over about a six-octave range. The left hand (or sometimes a foot pedal) controlled the volume. By gently shaking the right hand at the antenna a vibrato could be achieved, giving performances a little more musical (not to mention choreographic) interest. Fashionable women dressed in long gowns seemed to be favourite photographic subjects of the period as performers, as well as the inventor himself, poised ‘playing the rods’ in full dress tails, arms outstretched like a great conductor–or perhaps sorcerer.


1905 ◽  
Vol 74 (497-506) ◽  
pp. 20-30 ◽  
Author(s):  
William Napier Shaw

In the course of an investigation into the trajectories, or actual paths of air, by means of synoptic charts, which is still in progress,* it became apparent that the paths of air taking part in cyclonic dis­turbances near the British Isles when traced backward did not always originate in anti-cylonic areas, but followed a track skirting the neighbouring high-pressure areas and traversing sometimes a very large part of a belt of the earth in a direction more or less parallel to a line of latitude, and, on the other hand, air moving in the neighbour­hood of a cyclonic depression did not invariably seek the nearest baro­metric minimum, but sometimes passed on, leaving the circulation of the depression on the left hand.


Author(s):  
YASUNORI YAMAMOTO ◽  
KENICHI MORITA ◽  
KAZUHIRO SUGATA

Regular array grammars (RAGs) are the lowest subclass in the Chomsky-like hierarchy of isometric array grammars. The left-hand side of each rewriting rule of RAGs has one nonterminal symbol and at most one "#" (a blank symbol). Therefore, the rewriting rules cannot sense contexts of non-# symbols. However, they can sense # as a kind of context. In this paper, we investigate this #-sensing ability. and study the language generating power of RAGs. Making good use of this ability, We show a method for RAGs to sense the contexts of local shapes of a host array in a derivation. Using this method, we give RAGs which generate the sets of all solid upright rectangles and all solid squares. On the other hand. it is proved that there is no context-free array grammar (and thus no RAG) which generates the set of all hollow upright rectangles.


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