Search PubMed⌕ Search

SEARCH · Search PubMed

Results for “HANDEDNESS”

Search indexed PubMed citations on genomics, clinical trials, systematic reviews and public health. Explore titles, authors and supplied subject terms, then open the PubMed record.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 811 records · Page 45Linked to original sources
PubMed1999

Left-handedness and longevity in primates.

In the present research we used the rhesus macaque to model the decline in the incidence of left-handedness that has been noted in the aged human population. We found a significant group-level bias towards use of the left hand among young-adult macaques, and a significant group-level bias towards use of the right hand among aged macaques. The distribution of hand preference across age classes cannot be explained through simple elimination of left-handed subjects in the aged population. Rather, our data are consistent with a maturational view positing increased use of the right hand with increased age. Similar findings across phylogenetically diverse primate taxa suggest that this phenomenon is an evolutionarily ancient trait. Greater use of the left hand in male versus female macaques indicates that sex differences in hand preference are also deeply rooted in our primate origins.

Age Factors↗
PubMed1998

Generalizing everyday memory: signs and handedness.

Memory for frequently encountered road signs was investigated. In Experiment 1, the average level of recall of road sign features was found to be only 47%. In Experiment 2, more left-handed than right-handed people recalled that a walking figure faces right on one sign, whereas more right-handed than left-handed people recalled that a digging figure faces left on another sign. Performance thus reflected not a difference in level of mnemonic ability between left-handed and right-handed groups but instead the compatibility between group and task. In Experiment 3, participants were asked to draw any figure walking and any figure digging, with a pattern of results similar to that of Experiment 2. It is suggested that handedness effects in recall are mediated by motor imagery.

Adolescent↗
PubMed1993

The effect of upper extremity trauma on handedness.

The effect of severe trauma on handedness was studied through patient responses from 146 questionnaires that were correlated with individual chart review. Subjects were asked to designate their hand use preference, before and after injury, when performing 16 activities. The incidence of change in hand use was determined within four diagnostic types and five designated anatomical levels of injury. Results indicated a significant difference in the way subjects in different diagnostic types and anatomical levels of injury performed. Simple, short activities that did not require sustained fine motor coordination were reported as being performed more easily with a different hand after injury than complex, continuous activities that required sustained fine motor coordination. Significant differences in job duties and place of employment were found for the anatomical level of an injury but not for diagnostic type. Findings suggest that the diagnostic type, the anatomical level of an injury, and the complexity of a task should be considered before changes in hand use are recommended.

Activities of Daily Living↗
PubMedDate not supplied

Reading/writing vs handedness influences on line length estimation.

Left- and right-handed school children with differing reading/writing experiences (unidirectional left-to-right vs bidirectional) were asked to draw 3-cm lines from right-to-left or from left-to-right with each hand. With either hand, lines drawn from left to right were more accurate than those drawn from right to left, particularly for right-handed left-to-right users; bidirectional readers showed no directional bias. Moreover, bidirectional readers were more accurate than unidirectional readers. The findings support a greater influence of directional scanning effects than handedness on the task of line length estimation.

Child↗
PubMedDate not supplied

Distortion-product otoacoustic emissions in schoolchildren: effects of ear asymmetry, handedness, and gender.

The present study examined effects of ear asymmetry, handedness, and gender on distortion-product otoacoustic emissions (DPOAEs) obtained from schoolchildren. A total of 1003 children (528 boys and 475 girls), with a mean age of 6.2 years (SD = 0.4, range = 5.2-7.9 years), were tested in a quiet room at their schools using the GSI-60 DPOAE system. A distortion-product (DP)-gram was obtained for each ear, with f2 varying from 1.1 to 6.0 kHz and the ratio of f2/f1 at 1.21. The signal-to-noise ratios (SNRs) (DPOAE amplitude minus the mean noise floor) at the tested frequencies 1.1, 1.5, 1.9, 2.4, 3.0, 3.8, 4.8, and 6.0 kHz were measured. The results revealed a small but significant difference in SNR between ears, with right ears showing a higher mean SNR than left ears at 1.9, 3.0, 3.8, and 6.0 kHz. At these frequencies, the difference in mean SNR between ears was less than 1 dB. A significant gender effect was also found. Girls exhibited a higher SNR than boys at 3.8, 4.8, and 6.0 kHz. The difference in mean SNR, as a result of the gender effect, was about 1 to 2 dB at these frequencies. There was no significant difference in mean SNR between left-handed and right-handed children for all tested frequencies.

Acoustic Impedance Tests↗
PubMedDate not supplied

Stroke direction asymmetry in figure drawing: influence of handedness and reading/writing habits.

Recent studies suggest that asymmetries noted in certain nonlinguistic tasks used in laterality research (e.g., facial affect judgment, line bisection) may in part be influenced by prior reading/writing habits. The present study examined the relative influence of reading/writing direction and handedness on the direction of stroke movement in free-hand figure drawing. One hundred twenty right and left handed brain-intact adult readers of scripts with opposing directionality (Hindi vs Urdu) and illiterate controls were observed while drawing a tree, a hand, a house, an arrow, a pencil, and a fish. Right-handers (including right-handed illiterates) and left-to-right readers drew most figures in a left-to-right direction, whereas left handers (including left handed illiterates) and right-to-left readers more often drew the figures from right to left. These results extend previous findings and contribute to a growing body of evidence demonstrating reading scan biases in nonlinguistic perception and production tasks. It would appear that reading/writing habits cannot be ignored as a potential artifact in studies of hemisphere functional asymmetry employing nonlinguistic stimuli.

Adolescent↗
PubMed2002

[Study of hereditary mode on handedness, preferential foot and hand-clasping].

The data of 21 families were analyzed by the method of Slater's calculating model to differentiate between single-gene and multi-gene heredity and by the method of non-deviation analysis. The results showed that the hereditary mode of handedness or preferential foot or hand-clasping is the dominant heredity of single gene of autosome, and the right type of all of them is the dominant character. In a way, although environmental factors affected the phenotypes of these characters,hereditary factors were also the decisive ones.

English Abstract↗
PubMed1991

[Left-handedness and its clinical significance].

The occurrence rate of lefthanded persons is estimated to range between 4-8% in the human population, according to the criteria used. On assessing pathological lefthandedness, the role of all factors affecting the development of a lefthanded subject has to be considered. There are morphological differences between left- and righthanded subjects. The differences in neuropsychologie performance of the right and left hemisphere are less pronounced in lefthanded than in righthanded persons. A relationship between lefthandedness and the occurrence of some pathological conditions has been established. On sociobiological evaluation it appears more appropriate to consider lefthandedness as a continuous quantitative manifestation of handedness rather than a separate biological variant of man.

Dominance, Cerebral↗
PubMed1990

[Metric studies of the dermal ridges of the palm in relation to handedness].

Palm prints of 394 right-handers and 356 non-right-handers (left-handers and ambidexters) were evaluated regarding distance ad, ulnar shift, and relative horizontal triradius distance. Comparison between handedness groups produced some significant differences. The "graded distinction of dermatoglyphic traits" which was found in an earlier study has been confirmed. It has been suggested a modification of terminology for the position of axial triradii.

Dermatoglyphics↗
PubMed1979

The laterality of fractures and dislocations with respect to handedness.

The left/right frequency of fractures and dislocations with respect to handedness was investigated in 2,716 patients with isolated fractures or dislocations of the appendicular skeleton. For both left- and right-handed patients, upper limb fractures proximal to the wrist occurred more frequently on the left: fractures distal to the wrist, however, occurred more frequently on the patient's dominant side. No lateral tendencies were observed for lower limb injuries. A combination of endogenous and exogenous forces probably account for these findings. Awareness of these tendencies may lead to improved trauma management.

Fractures, Bone↗
PubMed1993

Recovery from aphasia and conversion of handedness: a case report.

A remarkably rapid and complete recovery from aphasia and conversion from right to left handedness was documented in a hemiplegic individual after surgery for an arteriovenous malformation (AVM) in the dominant hemisphere. The possible mechanisms of recovery were discussed and we have reviewed the literature about the pattern of cerebral dominance. Her rapid recovery could be explained by the co-dominance of the right and left cerebral hemispheres.

Adult↗
PubMedDate not supplied

[Cerebral dominance. A study on left-handedness in a Mexican population group].

The term "cerebral dominance" suggests that one hemisphere is leader and the other subordinate; however, cerebral dominance concerning all psychic functions is less frequent than we could suppose. Among the functions in which cerebral dominance is manifested the most notorious is the manual preference. Thus according to the hand being used for general motor activities the persons are named right-handers or left-handers; nevertheless people are less lateralized than we could suppose, and most right-handers may have hidden left-handedness. In order to obtain some data on this subject in Mexican population, a study was done in 300 university students. Of the 275 right-handers only 144 fulfilled the requirements to qualify as such after performing the complementary tests; 25 left-handers came to a mere amount of 5. The data indicate that partial lateralization is more frequent than total lateralization.

Adult↗
PubMed1997

The performance of hearing-impaired children on handedness and perceptual motor tasks.

The present study was designed to test for differences, if any, in children with impaired hearing compared with a control group of children with normal hearing (7-11-year-olds) in handedness, drawing, categorization, facial recognition, and play. Results indicated age differences in the performance of all the tasks. The children with hearing loss had more left-hand responses than the normal children did. For drawings, those whose hearing was impaired used more space and color. Both groups performed similarly on tasks of categorization and facial recognition. For play, children with hearing loss were more clumsy and accident prone than children in the control group. The results suggest that children with impaired hearing differ from those with normal hearing in tasks that are influenced by language processes and motor ability.

Child↗
PubMed1997

Sex and handedness in development of visuomotor skills.

Development of visuomotor skills in 420 left-banded and 420 right-handed school children were investigated using the Rey-Osterrieth Complex Figure. Analysis indicate that the visuomotor skills involved in copying a complex figure improve with age until the mean age of 10.5 yr., in both sex and handedness groups. Further analysis showed that girls performed significantly better than boys at certain developmental stages and right-handers performed better than left-handers in various age groups. Some possible differences in performance could be attributed to different rates of maturation of the cerebral hemispheres, to different neuropsychological strategies, or to functional differences between the sex groups and between right- and left-handed children.

Adolescent↗
PubMed1998

[Correction of left handedness worsened mirror writing in a girl with spastic diplegia].

We experienced a 4-year-11-month old girl with right side dominant spastic diplegia caused by preterm birth and neonatal asphyxia. She tended to use the left hand but showed mirror writing on both hands, which was aggravated by correction of handedness to the right. Magnetic resonance T2-weighted imaging revealed a localized high intensity lesion in the white matter of her left parietal lobe, caused by hypoxic insult and suggested a damage of spatial orientation center. Wechsler Preschool and Primary Scale of Intelligence showed a total IQ of 76, VIQ of 86 and PIQ of 74, revealing borderline intelligence with insufficient visual perception. Frostig visual perception test revealed lower scores of position in space. Spatial confusion caused by a lesion in the left parietal lobe might have induced the mirror writing of this case. Forced correction to use the right hand with damaged left parietal lobe may aggravate spatial confusion and consequently worsen mirror writing.

Cerebral Palsy↗