Study of Graphical Abilities in Children

1970 ◽  
Vol 30 (2) ◽  
pp. 615-630 ◽  
Author(s):  
Lilliane Lurcat ◽  
Irene Kostin
Keyword(s):  
Visual Information ◽  
Large Majority ◽  
Left Hand ◽  
Right Hand ◽  
Correct Form ◽  
Age Trends ◽  
Kinesthetic Information ◽  
The Right ◽  
Right And Left Hands

The Lurcat Test of Graphical Abilities was administered to 124 right-handed children between the ages of 4 and 10. Age trends were determined for the ability to reproduce the correct form of a curve, i.e., a cycloid or a spiral, when given (a) visual information alone, (b) both visual and kinesthetic information, and (c) kinesthetic information alone. Results for the right and left hands were determined separately. Age trends were examined, also, for the ability to reproduce the correct trajectory or orientation of these curves in the three situations mentioned above. Most of the development of these abilities in our sample seems to occur between the ages of 4 and 7. Reproducing cycloids with parallel rotations with both hands simultaneously while blindfolded seems to be related to laterality. In this situation, for 6- and 7-yr.-olds, the large majority of right-handed children correctly reproduce the rotation of the cycloid only with the right hand. The rotation produced by the left hand was found to be symmetrical rather than parallel to that produced by the right hand.

Manual Asymmetries in Aimed Movements

1989 ◽  
Vol 41 (3) ◽  
pp. 501-516 ◽  
Author(s):  
Eric A. Roy ◽  
Digby Elliott
Keyword(s):  
Visual Information ◽  
Movement Time ◽  
Delay Condition ◽  
Movement Initiation ◽  
Left Hand ◽  
Right Hand ◽  
Manual Asymmetries ◽  
Pointing Accuracy ◽  
The Right ◽  
Made In

Three hypotheses for the right-hand advantage in aiming movements were examined in these experiments: (1) the right-hand system is more efficient at processing visual information during the movement; (2) subjects make more use of visual information prior to movement initiation when using the right hand; (3) the right hand is less variable in generating force in initiating the pointing response as force demands increase. In the first experiment subjects pointed at a target located directly in front of them from two starting positions which defined short (25-cm) and long (35-cm) movements. The movements were made in three movement times, fast (150 to 249 msec), medium (250 to 349 msec) and slow (350 to 449 msec), under three vision conditions—full vision, and no vision (lights out) with immediate or delayed movement initiation. Performance was measured in movement time and accuracy in amplitude of movement. The results did not completely support any of the hypotheses regarding the right-hand advantage, although the left hand was generally more variable than the right. Also, variability increased with increases in movement length and decreases in movement time. The second experiment was designed to examine further the hypotheses regarding the right-hand advantage. In this experiment the same three visual conditions were used; however, subjects made only fast (<250-msec) movements. Also six rather than two starting positions were used. The increased variability of the left hand was observed again here. Further pointing accuracy with the left hand was more adversely affected in the no-vision delay condition. The implications of these results were discussed as they pertain to understanding the processes involved in visual aiming and the observed manual asymmetries.

Amount of Asymmetry in Grasp Reflex Depends on the Grasp Reflex of the Left Hand in Human Neonates

1994 ◽  
Vol 78 (1) ◽  
pp. 80-82 ◽  
Author(s):  
U. Tan
Keyword(s):  
Motor Asymmetry ◽  
Main Determinant ◽  
Left Hand ◽  
Right Hand ◽  
Right Brain ◽  
The Right ◽  
Human Neonates ◽  
Right And Left Hands

Grasp-reflex strengths from right and left hands were measured in 33 human neonates. There was no significant correlation between right minus left grasp-reflex strength and grasp-reflex strength from the right hand. The grasp-reflex strength of the left hand was negatively linearly correlated with the right minus left grasp-reflex strength. It was suggested that the right brain may be the main determinant for the motor asymmetry in hands.

An Examination of Change in Control of the Right and the Left Hand Across the Lifespan

2015 ◽  
Vol 3 (1) ◽  
pp. 11-22
Author(s):  
Tania S. Flink ◽  
Alexandra N. Iorio
Keyword(s):  
Age Groups ◽  
Aging Model ◽  
Left Hand ◽  
Manual Asymmetry ◽  
Right Hand ◽  
The Right ◽  
Sixth Decade ◽  
Central Factors ◽  
Right And Left Hands

This study examined changes in manual asymmetry across the lifespan using the Purdue pegboard protocol. One hundred and four right-handed individuals were recruited and separated by age decade. Individuals placed pegs into holes as fast as possible in 30 s using the right hand, left hand, and both hands simultaneously. Movements with the right hand were significantly faster than the left hand and for both hands for all age groups. The number of pegs successfully inserted into the holes significantly declined in the sixth decade, and this result was observed for both the right and left hands. No significant differences between the decades were observed with respect to the computed laterality quotient; thus, declines in manual asymmetry with age were not observed. It is suggested that the performance speed declines with age are likely to be due to central factors. Better performance of the right versus left hand across the lifespan supports the right hemi-aging model, and may also be due to practice, the differential roles of the right versus the left hand, and the task itself.

Role of Prenatal Position in Grasp-Reflex Asymmetry in Human Neonates

1994 ◽  
Vol 78 (1) ◽  
pp. 287-290 ◽  
Author(s):  
Uner Tan
Keyword(s):  
Hand Preference ◽  
Full Term ◽  
Left Hand ◽  
Right Hand ◽  
The Right ◽  
Human Neonates ◽  
Right And Left Hands

Grasp-reflex strengths were quantitatively measured from the right and left hands of 70 full-term human neonates. The right-left grasp-reflex linearly correlated with grasp-reflex only of the right hand in neonates with a right-ear-facing-out prenatal position. In neonates with left-ear-facing-out prenatal position, this grasp-reflex linearly increased with the grasp-reflex of the right hand and linearly decreased with the grasp reflex of the left hand. It was suggested that grasp-reflex asymmetry in neonates may, at least partly, depend upon prenatal position, which may also influence the later developing hand preference in humans.

Gabriel and the Virgin: The Secret of the Annunciation

2016 ◽  
Vol 24 (1) ◽  
pp. 149-158 ◽  
Author(s):  
Simon Altmann
Keyword(s):  
Mirror Symmetry ◽  
Present Author ◽  
Public Domain ◽  
Summary Table ◽  
Left Hand ◽  
The Public ◽  
Right Hand ◽  
The Right ◽  
Right And Left Hands

It has long been known that the vast majority of the Annunciation pictures show the Virgin on their right. All former studies, including one by the present author, treat this as a problem of left-right or mirror symmetry. This is not correct: this symmetry exchanges the right and left hands and such a transformation is not permitted: Gabriel, must always be represented as right-handed. That this is so emerged from the study of a database that we have created, which contains 1007 Annunciations from C3 to 1750. Details of this database, which the author intends to put in the public domain in due course, and of other results, will be left for a further paper. It is a sufficient example here that from C3 to 1400 Gabriel shows his right hand to the Virgin in 62 items out of 93, and the left hand in only two. Even from 1401 to 1750 the Angel shows his right hand to the Virgin 278 times and only 22 for the left. A brief pictorial study of the evolution of the Annunciation paintings from C3 onwards shows why the right-handedness of Gabriel made it easier for the painter to present him on the left. A summary table of the results obtained from the database is provided. This study offers some explanation of the fact pointed out in a former paper that sculptural representations of the Annunciation are often variant, with the Virgin on the left.

Editorial Note

1946 ◽  
Vol 11 (1) ◽  
pp. 2-2
Keyword(s):  
Editorial Note ◽  
Speech Sounds ◽  
Left Hand ◽  
Hand Column ◽  
Right Hand ◽  
Infant Speech ◽  
The Right

In the article “Infant Speech Sounds and Intelligence” by Orvis C. Irwin and Han Piao Chen, in the December 1945 issue of the Journal, the paragraph which begins at the bottom of the left hand column on page 295 should have been placed immediately below the first paragraph at the top of the right hand column on page 296. To the authors we express our sincere apologies.

scholarly journals Digit Variability in Carotenoid Scores Obtained with the Veggie Meter: A Pilot Study (P02-001-19)

2019 ◽  
Vol 3 (Supplement_1) ◽  
Author(s):  
Velarie Ansu ◽  
Stephanie Dickinson ◽  
Alyce Fly
Keyword(s):  
Indiana University ◽  
Left Hand ◽  
Funding Sources ◽  
Right Hand ◽  
Period Data ◽  
The Mean ◽  
The Right ◽  
Post Hoc ◽  
Main Effects ◽  
Mean Square Errors

Abstract Objectives To determine which digit and hand have the highest and lowest skin carotenoid scores, to compare inter-and-intra-hand variability of digits, and to determine if results are consistent with another subject. Methods Two subjects’ first(F1), second(F2), third(F3) and fifth(F5) digits on both hands were measured for skin carotenoids with a Veggie Meter, for 3 times on each of 18 days over a 37-day period. Data were subjected to ANOVA in a factorial treatment design to determine main effects for hand (2 levels), digits (4), and days (18) along with interactions. Differences between digits were determined by Tukey's post hoc test. Results There were significant hand x digit, hand x day, digit x day, and hand x digit x day interactions and significant simple main effects for hand, digit, and day (all P < 0.001). Mean square errors were 143.67 and 195.62 for subject A and B, respectively, which were smaller than mean squares for all main effects and interactions. The mean scores ± SD for F1, F2, F3, and F5 digits for the right vs left hands for subject A were F1:357.13 ± 45.97 vs 363.74 ± 46.94, F2:403.17 ± 44.77 vs. 353.20 ± 44.13, F3:406.76 ± 43.10 vs. 357.11 ± 45.13, and F5:374.95 ± 53.00 vs. 377.90 ± 47.38. For subject B, the mean scores ± SD for digits for the right vs left hands were F1:294.72 ± 61.63 vs 280.71 ± 52.48, F2:285.85 ± 66.92 vs 252.67 ± 67.56, F3:268.56 ± 57.03 vs 283.22 ± 45.87, and F5:288.18 ± 34.46 vs 307.54 ± 40.04. The digits on the right hand of both subjects had higher carotenoid scores than those on the left hands, even though subjects had different dominant hands. Subject A had higher skin carotenoid scores on the F3 and F2 digits for the right hand and F5 on the left hand. Subject B had higher skin carotenoid scores on F5 (right) and F1 (left) digits. Conclusions The variability due to hand, digit, and day were all greater than that of the 3 replicates within the digit-day for both volunteers. This indicates that data were not completely random across the readings when remeasuring the same finger. Different fingers displayed higher carotenoid scores for each volunteer. There is a need to conduct a larger study with more subjects and a range of skin tones to determine whether the reliability of measurements among digits of both hands is similar across the population. Funding Sources Indiana University.

scholarly journals Examination and Comparison of Theta Band Connectivity in Left- and Right-Hand Dominant Individuals throughout a Motor Skill Acquisition

Symmetry ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 728
Author(s):  
Jessica McDonnell ◽  
Nicholas P Murray ◽  
Sungwoo Ahn ◽  
Stefan Clemens ◽  
Erik Everhart ◽  
...  
Keyword(s):  
Skill Acquisition ◽  
Information Integration ◽  
Visual Information ◽  
Parietal Lobe ◽  
The United States ◽  
Alternative Methods ◽  
Population Difference ◽  
Left Hand ◽  
Right Hand ◽  
Neurological Differences

The majority of the population identifies as right-hand dominant, with a minority 10.6% identifying as left-hand dominant. Social factors may partially skew the distribution, but it remains that left-hand dominant individuals make up approximately 40 million people in the United States alone and yet, remain underrepresented in the motor control literature. Recent research has revealed behavioral and neurological differences between populations, therein overturning assumptions of a simple hemispheric flip in motor-related activations. The present work showed differentially adaptable motor programs between populations and found fundamental differences in methods of skill acquisition highlighting underlying neural strategies unique to each population. Difference maps and descriptive metrics of coherent activation patterns showed differences in how theta oscillations were utilized. The right-hand group relied on occipital parietal lobe connectivity for visual information integration necessary to inform the motor task, while the left-hand group relied on a more frontal lobe localized cognitive based approach. The findings provide insight into potential alternative methods of information integration and emphasize the importance for inclusion of the left-hand dominant population in the growing conceptualization of the brain promoting the generation of a more complete, stable, and accurate understanding of our complex biology.

The State Policy towards the Homeless in Moldova between the ‘Left Hand’ and the ‘Right Hand’. The Case of Chișinău Shelter

Südosteuropa ◽  
2019 ◽  
Vol 67 (2) ◽  
pp. 175-195
Author(s):  
Petru Negură
Keyword(s):  
Homeless People ◽  
Severe Disabilities ◽  
The State ◽  
Small Scale ◽  
Left Hand ◽  
Right Hand ◽  
Binary Approach ◽  
The One ◽  
The Right ◽  
Depth Interviews

Abstract The Centre for the Homeless in Chișinău embodies on a small scale the recent evolution of state policies towards the homeless in Moldova (a post-Soviet state). This institution applies the binary approach of the state, namely the ‘left hand’ and the ‘right hand’, towards marginalised people. On the one hand, the institution provides accommodation, food, and primary social, legal assistance and medical care. On the other hand, the Shelter personnel impose a series of disciplinary constraints over the users. The Shelter also operates a differentiation of the users according to two categories: the ‘recoverable’ and those deemed ‘irrecoverable’ (persons with severe disabilities, people with addictions). The personnel representing the ‘left hand’ (or ‘soft-line’) regularly negotiate with the employees representing the ‘right hand’ (‘hard-line’) of the institution to promote a milder and a more humanistic approach towards the users. This article relies on multi-method research including descriptive statistical analysis with biographical records of 810 subjects, a thematic analysis of in-depth interviews with homeless people (N = 65), people at risk of homelessness (N = 5), professionals (N = 20) and one ethnography of the Shelter.

scholarly journals The Left Hand Doesn’t Know What the Right Hand Is Doing—or Does It?

Cell Reports ◽  
2016 ◽  
Vol 17 (11) ◽  
pp. 2809-2810
Author(s):  
Jody C. Culham
Keyword(s):  
Left Hand ◽  
Right Hand ◽  
The Right
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