scholarly journals Drawing with the Non-dominant Hand: Implications for the Study of Construction

1998 ◽  
Vol 25 (4) ◽  
pp. 306-309 ◽  
Author(s):  
Sherma Zacharias ◽  
Andrew Kirk
Keyword(s):  
Neurological Disease ◽  
Right Hemisphere ◽  
Normal Subjects ◽  
Elderly Subjects ◽  
Dominant Hand ◽  
Left Hand ◽  
Right Hand ◽  
Left And Right ◽  
The Right ◽  
Right And Left Hand

ABSTRACT:Background:Constructional impairment following left vs. right hemisphere damage has been extensively studied using drawing tasks. A confounding factor in these studies is that right-handed patients with left hemisphere damage (LHD) are often forced by weakness to use their non-dominant (left) hand or hemiparetic dominant hand. Qualitative differences in the drawing characteristics of left and right hand drawings by normal subjects have not previously been characterized. The present study was undertaken to determine the qualitative differences between left and right hand drawings of normal subjects.Methods:Thirty right-handed, elderly subjects without a history of neurological disease were asked to draw, from memory, seven objects using the right and left hand. Half of the subjects were randomly assigned to draw with the left hand first, and half the right hand first. Right and left hand drawings were compared using a standardized scoring system utilized in several previous studies of drawing in focal and diffuse neurological disease. Each drawing was scored on eighteen criteria. Right and left hand drawing scores were then compared using the t-test for paired samples or the Wilcoxon matched-pairs testResults:Drawings made using the left hand were found to be significantly simpler, more tremulous and of poorer overall quality than drawings made by the same subjects using the right hand.Conclusions:The deficits found in left versus right hand drawings of normals are similar to those found in patients with LHD, suggesting that much of the drawing impairment seen following LHD is due to an elementary motor disturbance related to use of the non-dominant hand.

Lateral Differences in Schematic Face Encoding during Dual-Task Performance with Increasing Levels of Difficulty

1989 ◽  
Vol 68 (3) ◽  
pp. 767-778 ◽  
Author(s):  
Teresa Wilcox ◽  
R. Harter Kraft
Keyword(s):  
Right Hemisphere ◽  
Memory Task ◽  
Interference Effects ◽  
Left Hand ◽  
Right Hand ◽  
Dual Task Performance ◽  
Hand Tapping ◽  
Left And Right ◽  
The Right ◽  
Verbal Production

20 normal, right-handed, familial dextral men performed (a) unimanual finger tapping, (b) encoding of schematic faces at three levels of difficulty (3, 5, and 7 faces), (c) verbal production, (d) concurrent tapping and verbal production, and (e) concurrent tapping and face encoding. Subsequent recognition of faces was disrupted more by concurrent left-hand tapping than by concurrent right-hand tapping, supporting both the hypothesis that the right hemisphere mediates face encoding in adults and Kinsbourne and Hicks' (1978) “functional cerebral distance principle.” Left- and right-hand tapping rate and variability were not asymmetrically affected by either verbal production or face encoding. While there was an increase in generalized interference effects on face encoding, the degree of asymmetry of the interference remained constant. In addition, as the difficulty of the memory task increased, variability of tapping rate decreased. This was discussed in terms of attention and automatic motor programming.

Purdue Pegboard: Test-Retest Estimates

1988 ◽  
Vol 66 (2) ◽  
pp. 503-506 ◽  
Author(s):  
John R. Reddon ◽  
David M. Gill ◽  
Stephen E. Gauk ◽  
Marita D. Maerz
Keyword(s):  
Temporal Stability ◽  
Retest Reliability ◽  
Left Hand ◽  
Right Hand ◽  
The Right ◽  
Test Retest Reliability ◽  
Right And Left Hand ◽  
Over Time

26 normal, self-reported dextral subjects (12 men, 14 women) were assessed with a Purdue Pegboard 5 times at weekly intervals to evaluate temporal stability and efficacy of lateralization with this test. There was a statistically significant increase in performance over time for men on the right- and left-hand placing subtests and for women on the assemblies subtest. For men/women the test-retest reliability over the 5 sessions averaged .63/.76 for the right-hand, .64/.79 for the left-hand, .67/.81 for both-hands, .81/.83 for assemblies, and .33/.22 for the right/left-hand ratio.

scholarly journals Lateral comparisons using Fishman's skeletal maturation assessment

2014 ◽  
Vol 85 (3) ◽  
pp. 408-412 ◽  
Author(s):  
Abraham N. Safer ◽  
Peter Homel ◽  
David D. Chung
Keyword(s):  
Bone Development ◽  
Surgical Patients ◽  
Skeletal Maturation ◽  
Age And Gender ◽  
Left Hand ◽  
Right Hand ◽  
Significant Difference ◽  
Left And Right ◽  
And Gender ◽  
The Right

ABSTRACT Objective:  To assess lateral differences between ossification events and stages of bone development in the hands and wrists utilizing Fishman's skeletal maturation indicators (SMIs). Materials and Methods:  The skeletal ages of 125 subjects, aged 8 to 20 years, were determined with left and right hand-wrist radiographs using Fishman's SMI assessment. Each subject was also given the Edinburgh Handedness Questionnaire to assess handedness. The skeletal ages of both hand-wrist radiographs were analyzed against each other, handedness, chronologic age, and gender. Results:  There were no significant differences overall in right and left SMI scores (P  =  .70); 79% of all patients showed no difference in right and left SMI scores, regardless of handedness, gender, or age. However, when patients were categorized based on clinical levels of SMI score for the right hand-wrist, there was a significant difference (P  =  .01) between the SMI 1-3 group and the SMI 11 group. Subjects in the SMI 1-3 group were more likely to show a left > right SMI score, while subjects in the SMI 11 group were likely to show a right > left SMI score. Conclusion:  Although no significant overall lateral differences in SMI scores were noted, it may be advisable to obtain a left hand-wrist radiograph and/or additional diagnostic information to estimate completion of growth in young surgical patients.

Evaluation of Hand-Dominance on Manual Control of Aircraft

1996 ◽  
Vol 40 (2) ◽  
pp. 72-76 ◽  
Author(s):  
Valerie J. Gawron ◽  
James E. Priest
Keyword(s):  
Manual Control ◽  
Dominant Hand ◽  
Hand Dominance ◽  
Transport Aircraft ◽  
Left Hand ◽  
Tracking Tasks ◽  
Right Hand ◽  
Hand Control ◽  
Left And Right ◽  
Task Simulation

In the transport aircraft community the non-dominant hand control of aircraft is the norm. This historical precedence may be biasing the cockpit designs of the newer fly-by-wire aircraft which utilize a small sidestick controller rather than a wheel-column. Very little data are available to determine what effect non-dominant hand control using small throw controllers has on the pilot operator. To provide such data, a part-task simulation study was undertaken. Three different compensatory tracking tasks were performed with both left and right hand-controllers. Six right-hand dominant and three left-hand dominant subjects performed all three tasks, with both controllers. The results indicate that performance degraded and workload increased when the pilots were forced to use their non-dominant hand.

Influence of Spatial Mapping on Manual Aiming Asymmetries

1998 ◽  
Vol 86 (3) ◽  
pp. 967-975 ◽  
Author(s):  
Brian K. V. Maraj ◽  
Digby Elliott ◽  
James Lyons ◽  
Eric A. Roy ◽  
Tamara Winchester
Keyword(s):  
Right Hemisphere ◽  
Movement Time ◽  
Left Hand ◽  
Stimulus Response ◽  
Right Hand ◽  
Movement Error ◽  
Computer Mouse ◽  
Spatial Translation ◽  
Different Diameters ◽  
The Right

Two experiments were conducted to examine manual asymmetries in a one-dimensional aiming task. In Exp. 1, 10 right-handed adults slid a computer mouse 13 cm on a graphics tablet with both the right and left hands to targets of 3 different diameters. Under these conditions, the movement time for the right hand was significantly faster as expected. In Exp. 2, subjects performed similar movements to move a cursor 13 cm on a computer monitor. Thus the study was identical except the stimulus-response mapping was indirect. In this situation, there were no significant differences for either movement time or movement error between hands despite these performance measures indicating that target aiming was more difficult in Exp. 2. Because increases in task difficulty generally result in a greater advantage for the right hand, as indicated by Todor & Smiley, 1985, the present studies suggest that superiority of the right hand in aiming tasks may be diminished when spatial translation is required. Perhaps the spatial translation requires greater involvement of the right hemisphere, a process associated with manual advantage for the left hand, previously suggested by Roy and MacKenzie.

scholarly journals The Effect Ofinitial Practice with Dominant and Non-Dominant Hand on Acquisition, Retention and Transfer of a Complex Motor Task

2017 ◽  
Vol 14 (3) ◽  
pp. 1067-1074 ◽  
Author(s):  
Malihe Moones Tousi ◽  
Toktam Emami ◽  
Seyed Mojtaba Hoseini
Keyword(s):  
Movement Time ◽  
Motor Task ◽  
Transfer Task ◽  
Female Students ◽  
Dominant Hand ◽  
Left Hand ◽  
Right Hand ◽  
Significant Difference ◽  
Post Test ◽  
The Right

ABSTRACT: The purpose of this study is to analyze the effect of practice orderwithdominant and non-dominant hand on acquisition, retention and transfer of basketball dribbling skills of female students at Ferdowsi University. The subjects were 20 female students of General Physical Education (19-24), who did not have any experiences in basketball with dominant right hand. They were randomly selected and equally assigned into two groups. The subjects practiced within the program for 4 weeks, 2 times a week and 45 minutes per session. Group A practiced with their dominant right hand for the first four sessions and then switched to their left hand for the second four sessions. Group B practiced reversely. The subjects were assessed by Slalom-Dribble-Test in pre-test and post-test. Retention and transfer tests were performed one week after the exercise was finished. The results showed that there was no significant difference between the two groups in acquisition of dribbling skill (p=0.053). Movement time has been significantly reduced from pre-test to post-test (p=0.00). The results showed better performance of the right hand compared to the left (p=0.042). Both groups had a shorter dribbling time with the right hand compared to the left hand in the post-test and retention test. There was no significant difference between two groups in transfer task (p = 0.16). The results indicate that practicing with dominant and non-dominant limbs in the initial motor learning seems to be important to improve performance of both limbs and to strengthen bilateral competence of the learners.

scholarly journals Are left- and right-eye pupil sizes always equal?

2019 ◽  
Vol 12 (2) ◽  
Author(s):  
Gonca Gokce Menekse Dalveren ◽  
Nergiz Ercil Cagiltay
Keyword(s):  
Cognitive Load ◽  
Movement Analysis ◽  
Difficulty Level ◽  
Human Beings ◽  
Left Hand ◽  
Surgical Residents ◽  
Right Hand ◽  
Significant Difference ◽  
Left And Right ◽  
The Right

Eye movements provide very critical information about the cognitive load and behaviors of human beings. Earlier studies report that under normal conditions, the left- and right-eye pupil sizes are equal. For this reason, most studies undertaking eye-movement analysis are conducted by only considering the pupil size of a single eye or taking the average size of both eye pupils. This study attempts to offer a better understanding concerning whether there are any differences between the left- and right-eye pupil sizes of the right-handed surgical residents while performing surgical tasks in a computer-based simulation environment under different conditions (left hand, right hand and both hands). According to the results, in many cases, the right-eye pupil sizes of the participants were larger than their left-eye pupil sizes while performing the tasks under right-hand and both-hands conditions. However, no significant difference was found in relation to the tasks performed under left-hand condition in all scenarios. These results are very critical to shed further light on the cognitive load of the surgical residents by analyzing their left-eye and right-eye pupil sizes. Further research is required to investigate the effect of the difficulty level of each scenario, its appropriateness with the skill level of the participants, and handedness on the differences between the left- and right-eye pupil sizes.

Fingertip Number-Writing Errors by Psychiatric Patients

1984 ◽  
Vol 59 (3) ◽  
pp. 933-934 ◽  
Author(s):  
James K. Maxwell ◽  
Fred Wise ◽  
Mary Pepping ◽  
Brenda D. Townes ◽  
John Peel ◽  
...  
Keyword(s):  
Right Hemisphere ◽  
Psychiatric Patients ◽  
Spatial Processing ◽  
Practice Effects ◽  
Left Hand ◽  
Writing Test ◽  
Right Hand ◽  
The Right ◽  
Writing Errors ◽  
Writing Task

Records from 495 psychiatric patients from two neuropsychology laboratories indicated the Fingertip Number Writing test shows a significant and reliable left-hand advantage within and between laboratories. While the left-hand advantage may reflect a right-hemisphere superiority for tactile-spatial processing, it is not possible to distinguish between right hemispheric functional superiority and practice effects between hands because the standard fingertip writing task always starts with the right hand.

Age-related differences in corticospinal control during functional isometric contractions in left and right hands

2005 ◽  
Vol 99 (4) ◽  
pp. 1483-1493 ◽  
Author(s):  
Martin V. Sale ◽  
John G. Semmler
Keyword(s):  
Older Adults ◽  
Precision Grip ◽  
Silent Period ◽  
Isometric Contractions ◽  
Age Difference ◽  
Left Hand ◽  
Right Hand ◽  
Age Related ◽  
Left And Right ◽  
The Right

The purpose of the study was to examine age-related differences in electromyographic (EMG) responses to transcranial magnetic stimulation (TMS) during functional isometric contractions in left and right hands. EMG responses were recorded from the first dorsal interosseus muscle following TMS in 10 young (26.6 ± 1.3 yr) and 10 old (67.6 ± 2.3 yr) right-handed subjects. Muscle evoked potentials (MEPs) and silent-period durations were obtained in the left and right hands during index finger abduction, a precision grip, a power grip, and a scissor grip, while EMG was held constant at 5% of maximum. For all tasks, MEP area was 30% ( P < 0.001) lower in the left hand of old compared with young subjects, whereas there was no age difference in the right hand. The duration of the EMG silent period was 14% ( P < 0.001) shorter in old (150.3 ± 2.9 ms) compared with young (173.9 ± 3.0 ms) subjects, and the age differences were accentuated in the left hand (19% shorter, P < 0.001). For all subjects, the largest MEP area (10–12% larger) and longest EMG silent period (8–19 ms longer) were observed for the scissor grip compared with the other three tasks, and the largest task-dependent change in these variables was observed in the right hand of older adults. These differences in corticospinal control in the left and right hands of older adults may reflect neural adaptations that occur throughout a lifetime of preferential hand use for skilled (dominant) and unskilled (nondominant) motor tasks.

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