scholarly journals A Dynamic Model for Limb Selection

2021 ◽  
Author(s):  
Ralf Cox
Keyword(s):  
Dynamic Model ◽  
Selection Process ◽  
Switch Point ◽  
Small Cube ◽  
Left Hand ◽  
Left Handed ◽  
Limb Selection ◽  
Limb Dominance ◽  
Multiple Timescale ◽  
Manual Activity

Two experiments and a model on limb selection are reported. In Experiment 1 left-handed and right-handed participants (N = 36) repeatedly used one hand for grasping a small cube. After a clear switch in the cube’s location, perseverative limb selection was revealed in both handedness groups. In Experiment 2 the cubes were presented in a clockwise and counter-clockwise sequence to right-handed participant (N = 15). A spatial delay in the switch point between right-hand use and left-hand use was observed. The model simulates the experiments, by implementing the multiple-timescale dynamics of the action-selection process underlying limb selection. It integrates two mechanisms that were earlier proposed to underlie this selection aspect of manual activity: limb dominance and attentional information. Finally, the model is used to simulate Gabbard et al.’s (1997) experiment, offering a concise coupling of strength and direction of handedness.

Single molecule optical diffraction: A tool for understanding the structure of triple stranded left-hand helical cellulose

1989 ◽  
Vol 47 ◽  
pp. 1024-1025
Author(s):  
George C. Ruben ◽  
William Krakow
Keyword(s):  
Single Molecule ◽  
Helical Structure ◽  
Optical Diffraction ◽  
Maximum Diameter ◽  
Primary Cell Wall ◽  
Cellulose Synthesis ◽  
Left Hand ◽  
Left Handed ◽  
Freeze Dried ◽  
Diffraction Patterns

Tobacco primary cell wall and normal bacterial Acetobacter xylinum cellulose formation produced a 36.8±3Å triple-stranded left-hand helical microfibril in freeze-dried Pt-C replicas and in negatively stained preparations for TEM. As three submicrofibril strands exit the wall of Axylinum , they twist together to form a left-hand helical microfibril. This process is driven by the left-hand helical structure of the submicrofibril and by cellulose synthesis. That is, as the submicrofibril is elongating at the wall, it is also being left-hand twisted and twisted together with two other submicrofibrils. The submicrofibril appears to have the dimensions of a nine (l-4)-ß-D-glucan parallel chain crystalline unit whose long, 23Å, and short, 19Å, diagonals form major and minor left-handed axial surface ridges every 36Å.The computer generated optical diffraction of this model and its corresponding image have been compared. The submicrofibril model was used to construct a microfibril model. This model and corresponding microfibril images have also been optically diffracted and comparedIn this paper we compare two less complex microfibril models. The first model (Fig. 1a) is constructed with cylindrical submicrofibrils. The second model (Fig. 2a) is also constructed with three submicrofibrils but with a single 23 Å diagonal, projecting from a rounded cross section and left-hand helically twisted, with a 36Å repeat, similar to the original model (45°±10° crossover angle). The submicrofibrils cross the microfibril axis at roughly a 45°±10° angle, the same crossover angle observed in microflbril TEM images. These models were constructed so that the maximum diameter of the submicrofibrils was 23Å and the overall microfibril diameters were similar to Pt-C coated image diameters of ∼50Å and not the actual diameter of 36.5Å. The methods for computing optical diffraction patterns have been published before.

Mixed Handedness and Achievement Test Scores of Middle School Boys

2008 ◽  
Vol 107 (2) ◽  
pp. 497-506
Author(s):  
P. S. B. Sarma
Keyword(s):  
Middle School ◽  
At Risk ◽  
Test Scores ◽  
Fourth Grade ◽  
Achievement Test ◽  
Normal Curve ◽  
Left Hand ◽  
Left Handed ◽  
Academic Deficits ◽  
The Right

The purpose of the study was to replicate findings of an earlier study of fourth grade boys manifesting mixed handedness with a sample. Among 32 mixed-handed boys in Grades 6 to 8, the right-handed writer, left-handed thrower group obtained low spelling scores (Normal Curve Equivalent Scores) on the California Achievement Test significantly more frequently than the left-handed writer, right-handed thrower group. These findings are consistent with data for Grade 4 boys in the earlier study. Findings strengthen the hypotheses that mixed handedness is not a unitary neuropsychological entity and that boys who write with the right hand and throw with the left hand might be at risk for certain academic deficits.

scholarly journals Hand Preference and Creativity of Papua University Student

2022 ◽  
Vol 8 (1) ◽  
pp. 257-262
Author(s):  
Vionita Putri ◽  
Elda Irma Jeanne Joice Kawulur ◽  
Febriza Dwiranti ◽  
Sabarita Sinuraya ◽  
Sita Ratnawati
Keyword(s):  
Hand Preference ◽  
University Student ◽  
Creative People ◽  
Left Hand ◽  
Adjective Check List ◽  
Left Handed ◽  
Males And Females ◽  
Papua Barat ◽  
The Right ◽  
Descriptive Method

Human has a preference to use their hands for various manual activities. Left-handed preference is people who tend to use their left hand to perform various manual activities, while right-handed people tend to use right-handed. Any researches show that the left-handed preference for more creativity was influenced by the dominant use of the right brain and bigger corpus callosum. The research aims to determine the percentage of left-handed preference and their creativity in Universitas Papua, Manokwari Papua Barat. The method used in this research is the descriptive method. Data collection used a questionnaire to evaluate individual hand preference using Handedness Questionnaire and to determine individual creativity using Adjective Check List. The percentage of left-handed people in UNIPA were 9.3% or lower than right-handed and higher than ambidextrous. Our study supports the statement about selection in handedness in the traditional society which showed a higher percentage of left-hander as advantages related to using hand intensively.  The percentage of left-handed males and females was almost equal and strongly left-handed was higher in females. The percentage of creative people was higher in left-handed, especially in males

Piano Concertos for the Left Hand by Ravel and Prokofiev: Two Answers to One Order

2020 ◽  
pp. 67-91
Author(s):  
В.И. Чернышов
Keyword(s):  
Significant Contribution ◽  
Maurice Ravel ◽  
Musical Language ◽  
Sergei Prokofiev ◽  
Piano Concerto ◽  
Left Hand ◽  
Left Handed ◽  
Piano Literature ◽  
The One ◽  
Piano Concertos

Пианист Пауль Витгенштейн, желая расширить и обновить свой концертный репертуар, внес в XX веке существенный вклад в фортепианную литературу для левой руки. В 1929–1930 годах он заказывает фортепианный концерт сначала Морису Равелю, а затем Сергею Прокофьеву. Это оказалось возможным благодаря наследству, полученному пианистом после смерти отца — сталелитейного магната Карла Витгенштейна. Если Равелю удалось, хоть и не полностью, удовлетворить потребности заказчика, то Прокофьеву было вовсе отказано в исполнении его музыки. Одной из главных причин неудачи Прокофьева можно считать творческий кризис конца зарубежного периода, когда композитор находился в поисках нового музыкального языка — «новой простоты». В статье прослеживается и сравнивается судьба этих произведений; устанавливаются причины сравнительной невостребованности концерта Прокофьева исполнителями; анализируется композиция, фортепианная фактура и техника, оркестровка. Освещены биографические факты из жизни Пауля Витгенштейна, а также непростые отношения между заказчиком и композиторами. In the twentieth century, the one-armed pianist Paul Wittgenstein made a significant contribution to piano literature for the left hand, which was due to his wish to broaden and update his concert repertoire. In 1929–1930 he ordered a left-handed piano concerto first to Maurice Ravel and then to Sergei Prokofiev. It was possible through the inheritance that Wittgenstein received after the death of his father, the steel magnate Karl Wittgenstein. While Ravel was able to meet the client’s needs, though not completely, Prokofiev was completely denied the performance of his music. One of the main reasons for Prokofiev’s failure might be the creative crisis of the end of the foreign period, when the composer was in search of a new musical language — “the new simplicity”. The article traces and compares the destiny of these piano concertos, specifying the reasons for the relative lack of demand for Prokofiev’s left-handed concerto on behalf of performers. The article also analyzes music, piano texture and technique, form, orchestration of the lefthanded concertos. Special attention is paid to biographical facts from Paul Wittgenstein’s life, as well as uneasy relationship between the client and the composers.

Kolisch, Rudolf (1896–1978)

2018 ◽  
Author(s):  
Daniel Bangert
Keyword(s):  
World War I ◽  
World War ◽  
Chamber Works ◽  
Second Viennese School ◽  
Left Hand ◽  
University Of Vienna ◽  
University Of Wisconsin ◽  
Left Handed ◽  
Postgraduate Studies ◽  
The University

Rudolf Kolisch was an Austrian-born violinist, teacher, and conductor. As leader of the Kolisch Quartet he premiered many important chamber works by the Second Viennese School and other modernist composers of the first half of the twentieth century. He later became leader of the Pro Arte Quartet and taught at the University of Wisconsin in Madison and at the New England Conservatory in Boston. Kolisch was born in Klamm am Semmering, Austria on 20 July 1896. His father Rudolf was a doctor and his mother Henriette a pianist. Soon after starting violin lessons, an injury to his left hand led him to hold the violin in his right hand and bow left-handed. He attended the Vienna Music Academy and the University of Vienna, but his postgraduate studies were interrupted by three years of service in the Austrian army during World War I. His teachers included the Czech violinist Otakar Ševčík, the composer Franz Schrecker, and the musicologist Guido Adler.

Optical Properties of Dielectric-Graphene Left Hand Material Structure

MRS Advances ◽  
2019 ◽  
Vol 4 (53) ◽  
pp. 2907-2912
Author(s):  
R. Hinojosa-Domínguez ◽  
J. S. Pérez-Huerta ◽  
D. Ariza-Flores ◽  
I. A. Sustaita-Torres ◽  
J. Madrigal-Melchor
Keyword(s):  
Optical Properties ◽  
Absorption Spectra ◽  
Light Polarization ◽  
Material Structure ◽  
Left Hand ◽  
System Building ◽  
Left Handed ◽  
Line Form ◽  
Left Hand Material ◽  
Transmission And Absorption

ABSTRACTIt is well known the remarkable optical properties of both graphene and left handed materials, for which we study the optical properties of a multilayer system building by graphene-dielectric-left hand material. In this work, we show the transmission, reflection and absorption spectra for a different set of parameters of the left-handed material structure. It is important to highlight that the inclusion of graphene remarkably modifies the transmission and absorption spectra. The optical properties of the graphene-LHM can be modulated via the different parameters of system. We showed that the fill function do not change the line form of the spectra, however, modify their amplitudes. With respect to light polarization, it’s possible to observe that the spectra are widen for TM respect to TE polarization.

Foot Performance of Right- and Left-Handers: A Question of Environmental Influence

1995 ◽  
Vol 80 (2) ◽  
pp. 671-674 ◽  
Author(s):  
Carl Gabbard ◽  
Susan Hart
Keyword(s):  
Environmental Influence ◽  
Hand Preference ◽  
Adequate Explanation ◽  
Driving Experience ◽  
Left Hand ◽  
Left Handed ◽  
Right Hand ◽  
Theoretical Perspectives ◽  
The Difference ◽  
The Right

Prior research has shown that right-handed adults perform better on a speed-tapping task with the right hand and right foot, while left-handers execute more rapidly with the left hand and right foot. Speculation is that environmental influence, most likely driving experience, may account for the right-foot bias. To examine this hypothesis further, 48 young right- and left-handed children were tested on a similar protocol. Analyses indicated no significant differences in foot performance within hand-preference groups. Since these findings do not complement reports for adults, factors such as experience or maturation might contribute to the difference. Were patterns similar, the effect of environmental influence would be assumed to be small. However, much more evidence is needed before an adequate explanation can be developed. The issue of possible environmental influence is discussed from various theoretical perspectives.

Modulating Children’s Manual Preference Through Spontaneous Nondominant Hand Use

2017 ◽  
Vol 124 (5) ◽  
pp. 932-945 ◽  
Author(s):  
Juliana Maia Garcia ◽  
Luis Augusto Teixeira
Keyword(s):  
Left Hand ◽  
Nondominant Hand ◽  
Left Handed ◽  
Nonpreferred Hand ◽  
Motor Activities ◽  
Repeated Use ◽  
Previous Phase

We evaluated the effect of repeated use of the nonpreferred hand on young children’s manual preference by positioning toys in the left hemifield in egocentric coordinates to induce right-handed 4–5-year-olds to use their left hands spontaneously. We induced motor activities in the laterally biased workspace by presenting tasks in a ludic context over different days, similar to their daily kindergarten experience. Preceding and following these lateralized experiences, the children were tested on a task requiring reaching, grasping, and inserting cards into a slot. In the 1-day retention assessment, we found that repeated use of the nonpreferred left hand in the previous phase led to increased use of the left hand to perform the probing task. Following 14 days of rest, the children with induced left-hand experiences used exclusively their left hands to manipulate the leftmost card positions. We propose that repeated use of the nonpreferred left hand leads to increased confidence to plan left-handed movements for subsequent tasks.

scholarly journals Handedness and index finger movements performed on a small touchscreen

2016 ◽  
Vol 115 (2) ◽  
pp. 858-867 ◽  
Author(s):  
Tomoko Aoki ◽  
Gil Rivlis ◽  
Marc H. Schieber
Keyword(s):  
Right Hemisphere ◽  
Index Finger ◽  
Impedance Control ◽  
Tracking Task ◽  
Left Index Finger ◽  
Time Lags ◽  
Left Hand ◽  
Left Handed ◽  
Right Hand ◽  
Hemisphere Specialization

Many studies of right/left differences in motor performance related to handedness have employed tasks that use arm movements or combined arm and hand movements rather than movements of the fingers per se, the well-known exception being rhythmic finger tapping. We therefore explored four simple tasks performed on a small touchscreen with relatively isolated movements of the index finger. Each task revealed a different right/left performance asymmetry. In a step-tracking Target Task, left-handed subjects showed greater accuracy with the index finger of the dominant left hand than with the nondominant right hand. In a Center-Out Task, right-handed subjects produced trajectories with the nondominant left hand that had greater curvature than those produced with the dominant right hand. In a continuous Circle Tracking Task, slips of the nondominant left index finger showed higher jerk than slips of the dominant right index finger. And in a continuous Complex Tracking Task, the nondominant left index finger showed shorter time lags in tracking the relatively unpredictable target than the dominant right index finger. Our findings are broadly consistent with previous studies indicating left hemisphere specialization for dynamic control and predictable situations vs. right hemisphere specialization for impedance control and unpredictable situations, the specialized contributions of the two hemispheres being combined to different degrees in the right vs. left hands of right-handed vs. left-handed individuals.

Laterality and Force of Handgrip during the First Two Years at School

1989 ◽  
Vol 68 (3) ◽  
pp. 955-962 ◽  
Author(s):  
Heinz Krombholz
Keyword(s):  
Repeated Measures ◽  
Superior Performance ◽  
First Year ◽  
Left Hand ◽  
Lateral Dominance ◽  
Repeated Measures Design ◽  
Left Handed ◽  
Second Year ◽  
Paper And Pencil ◽  
The Right

The connection between lateral dominance and force of handgrip was investigated by means of a repeated-measures design. 521 children participated. Performance on a paper-and-pencil task and force of handgrip were measured at the beginning of the first year at school and at the end of the first and of the second years at school. On the paper-and-pencil task 84% of the children were classified as right-handers, 8% as left-handers, and 8% as ambidexterous. About 2% of children classified as right-handers at the beginning of the first year at school were classified as left-handers at the end of the second year at school while 18% of left-handers shifted to right-handedness. 52% of children attained their best performance on handgrip with the right hand and 39% with the left hand. No differences could be found either for the right or for the left hand in force of handgrip between right- and left-handed and ambidexterous children. For right-handers, however, the more skilled hand showed superior performance in force of handgrip. These results indicate that left-handers are less strongly handed than right-handers.

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