Handedness in Relation to Measures of Motor and Tactile-Perceptual Functions in Normal Children

1976 ◽  
Vol 43 (2) ◽  
pp. 475-481 ◽  
Author(s):  
M. Alan J. Finlayson ◽  
Ralph M. Reitan
Keyword(s):  
Educational Attainment ◽  
Full Scale ◽  
Symbol Recognition ◽  
Motor Tasks ◽  
Normal Children ◽  
Right Hand ◽  
The Right ◽  
Right And Left Hands

10 boys and 10 girls were tested at each of six age levels (6, 7, 8, 12, 13, and 14 yr.). All of the children were right-handed, and at each age level the groups did not differ in age, WISC Full Scale IQ, or educational attainment. The groups were compared on motor tasks (strength and speed) and tactile-perceptual tasks (finger localization and symbol recognition). The performances of the right and left hands were compared. The results indicated clear right-hand motor superiority, but no “sidedness” effect for the tactile-perceptual measures. The implication of these results for brain-behaviour relationships was discussed.

Haptic Identification of Letters Using the Left or Right Hand

1988 ◽  
Vol 66 (2) ◽  
pp. 403-406 ◽  
Author(s):  
Lester Hunt ◽  
Heidi Edwards ◽  
Kathryn Quest
Keyword(s):  
Perceptual Learning ◽  
Right Hemisphere ◽  
Letter Identification ◽  
Identification Time ◽  
Right Hand ◽  
Hands On ◽  
The Right ◽  
Right And Left Hands

The present study investigated the effects of the use of the right and left hands on haptic identification of letters of the alphabet. Each of the 64 right-handed subjects was given three series of randomly ordered presentations of the 26 letters of the alphabet. The subjects were asked to feel each letter and name correctly each letter as quickly but as accurately as possible. Analysis showed faster identification by those subjects using their left hands on Series 1 with no hand-differences appearing on Series 2 and 3. Significant over-all improvement in identification time occured with practice. The results were interpreted in terms of a novelty hypothesis of right-hemisphere function and an explanation of perceptual learning of letter identification.

Possible Lateralization of Peripheral Nerve Conduction Associated with Gender

1995 ◽  
Vol 81 (3) ◽  
pp. 939-943 ◽  
Author(s):  
Meliha Tan ◽  
Üner Tan
Keyword(s):  
Peripheral Nerve ◽  
Conduction Velocity ◽  
Nerve Conduction ◽  
Nerve Conduction Velocity ◽  
Right Hand ◽  
Sensory Conduction ◽  
The Mean ◽  
The Right ◽  
Right And Left Hands

Lateralization of peripheral nerve conduction velocity was studied in right-handed men ( n = 40) and women ( n = 48). Sensory and motor velocities were measured in ulnar and median nerves of the right and left hands. In women, the mean sensory velocity was significantly faster in the left than the right hand. There were no significant right-left differences in men. The mean sensory velocity from the right hand was significantly slower in women than men, creating an asymmetric organization of sensory conduction in women. Estradiol in women and testosterone in men were suggested as playing a role in asymmetric and symmetric nerve conductions, respectively.

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.

Laterality and Directional Preferences in Preschool Children

1982 ◽  
Vol 55 (3) ◽  
pp. 863-870 ◽  
Author(s):  
Lesley E. Tan
Keyword(s):  
Preschool Children ◽  
Line Drawing ◽  
Hand Movements ◽  
Motor Tasks ◽  
Left Handed ◽  
Simple Motor ◽  
Simple Line Drawing ◽  
Right Hand ◽  
Directional Preference ◽  
The Right

Directional preference for horizontal hand movements was investigated in 49 right-handed and 49 left-handed 4-yr.-olds, using three tests: (1) copying a line drawn between two dots, (2) starting to trace around a bilaterally symmetrical angular path, and (3) drawing a line after a demonstration. Both handedness groups showed strong preference for outward movements for simple line drawing, though there was a significant tendency to copy the demonstrated direction. For the tracing task, both handedness groups exhibited directional preference for the right hand only. Conflicting results of earlier studies can be reconciled with each other and with these data by assuming that directionality for more complex perceptual-motor tasks has a different basis from directionality for simple motor tasks and that it is established at a later age but only for the right hand. Differences between the hands may be in specialization of contralateral hemispheres. Footedness, eyedness were not significant.

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.

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.

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.

Asymmetry of Manual Preference and Performance

1982 ◽  
Vol 54 (1) ◽  
pp. 179-194 ◽  
Author(s):  
K. A. Provins ◽  
A. D. Milner ◽  
Penny Kerr
Keyword(s):  
Clinical Practice ◽  
University Students ◽  
Motor Tasks ◽  
Left Handedness ◽  
And Performance ◽  
The Right ◽  
Manual Performance ◽  
Right And Left Hands ◽  
Good Agreement

Laterality assessments for 1,966 unselected psychology undergraduates are compared on three questionnaires of tested reliability. Performances of the right and left hands of 167 university students are also reported for eight motor tasks of known reliability. Questionnaire results show good agreement among the three different methods of assessment for right-handedness but not for left-handedness. Preferences on activities such as handwriting and throwing suggest these are well-lateralized skills but that tasks mostly requiring strength are not; these findings are supported by data from the study of manual performance. The validity of handedness measures is discussed, and it is suggested that a longer and more wide-ranging questionnaire with self-weighting of items may provide a more appropriate alternative to the 10- or 12-item inventory usually employed for purposes of research or clinical practice.

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.

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