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At least 991 records · Page 55Linked to original sources
PubMed1981

Tachistoscopic recognition of Kana and Hangul words, handedness and shift of laterality difference.

Nonsense Kana words as verbal stimuli and Hangul words (Korean orthographic characters) as non-verbal were presented tachistoscopically in the left or right visual field to normal right-handed, non-familial left-handed Japanese subjects, who have not seen Hangul characters. Right-handers showed a significant right (or left) field superiority for the recognition of verbal (or non-verbal) stimuli. This pattern of differences found in right-handers is, though to a slightly lesser degree, also present in non-familial left-handers, while it is absent in familial left-handers. Initial left field superiority for Hangul word recognition shifted to no laterality difference in left-handers as well as in right-handers during the learning period for Hangul words.

Adolescent↗
PubMed1983

Lateralized interference of repetitive finger tapping: influence of familial handedness, cognitive load and verbal production.

The repetitive finger tapping of 24 right-handed subjects from dextral and sinistral families was evaluated. Subjects tapped with and without concurrent verbal tasks which included reciting a nursery rhyme, reading words (silent vs aloud) and solving anagrams (silent vs aloud). Overall, results indicated that the concurrent verbal tasks interfered more with right-hand tapping than with left-hand tapping. This pattern was more pronounced for familial dextral subjects than familial sinistral subjects. This latter finding was most evident with the complex verbal task of solving anagrams.

Adult↗
PubMed1984

Handedness data on the European neolithic.

An analysis of grinding striations on neolithic bone and antler implements yielded a regional variation of the percentage of left-handed individuals in Southern Germany and Switzerland during the fourth millenium B.C. While the Swiss data show as little as 6.3% to have been left-handed, the Southern German data reveal three times as much.

Biological Evolution↗
PubMed1984

Left-handedness and field-independence.

Left-handed persons have been reported to show less field-independence than right-handed persons. Using a large sample of left-handers (96), a replication attempt was made and the opposite result was obtained. Left-handers were found to be more field-independent than right-handers. Results from previous studies were probably due to the use of extremely small samples of left-handers (four and 10). Different instrumentation was ruled out since the Embedded Figures Test and the Group Embedded Figures Test are essentially the same.

Adult↗
PubMed1984

Lateral specialization and verbal/spatial ability in preschool children: age, sex and familial handedness differences.

One hundred and fifty-five preschool children between 2 1/2 and 5 1/2 yr of age were administered two dichotic tests (digit and nonverbal sound) and three Wechsler Intelligence subtests (vocabulary, geometric design and block design). The familial dextral (FD) children around 4 yr and older demonstrated a greater degree of absolute ear laterality than the FD children under 4 yr of age. There were also age-related changes in the relationship between children's ability scores and their ear laterality scores. For older FD children a greater right-ear advantage for verbal stimuli and a left-ear advantage for nonverbal stimuli was associated with higher vocabulary scores. Under 4 yr of age, however, a strong right-ear advantage for verbal stimuli was associated with relatively higher spatial than vocabulary ability. For these younger FD children, less marked laterality predicted higher vocabulary scores. It is hypothesized that a cortical organizational transition is occurring around 4 yr of age and that this transition involves a shift from reliance on subcortical to cortical mediation, accompanied by increasing callosally mediated inhibition and integration of hemispheric function. Furthermore, there were sex differences observed in the relationship between lateral specialization and spatial ability. As young as 2 1/2 yr of age, the FD boys' spatial ability scores were positively associated with having a left-ear advantage for nonverbal sound stimuli. The FD girls' spatial ability scores were not significantly related to their ear advantage scores for nonverbal sounds but were associated with their ear advantage scores for verbal stimuli. In addition, around 4 yr of age a shift was observed in the relationship between the boys' absolute laterality scores and the difference between their spatial and vocabulary ability scores which was not found for the girls' scores. It it suggested that the maturation of right hemispheric spatial mediation may be delayed or inhibited in girls.

Auditory Perception↗
PubMed1984

[Hemispheric dominance for speech and calculation: electrophysiologic correlates of left dominance in left handedness].

Slow brain potentials were recorded in left-handers and right-handers during: (i) processing of language and mental arithmetic tasks, without vocalization, and (ii) subsequent writing down of the answers with either the right or left hand. Left-sided laterality of negative potentials was taken as evidence of hemispheric dominance. It appeared during the processing of words and numbers in 26 of the 30 left-handers and was localized mainly in the left frontal and temporal parietal regions. Similar results were found with the right-handers. This electrophysiological evidence indicates that the left hemisphere is dominant for language and calculation in the vast majority of left-handers. Only when writing with either their left or right hand do left-handers show less left-sided laterality than right-handers.

Adolescent↗
PubMed1985

Electrophysiological correlates of handedness and speech perception contrasts.

Auditory evoked responses (AERs) were recorded from left- and right-handed subjects who listened to consonant sounds from different phonetic categories. AERs recorded at parietal scalp regions indicated both groups differentiated categorical differences between speech sounds. However, hand preferences did not affect hemisphere responses to speech sounds.

Adolescent↗
PubMed1985

The effects of handedness on event-related potentials in a rhyme-matching task.

Event-related potentials (ERPs) were recorded from one midline and three pairs of homotopic lateral sites while subjects determined whether or not sequentially presented words rhymed. ERPs from 11 left-handed males with a family history of sinistrality were compared with those from 12 right-handers, none of whom had such a family history. As in previous work (e.g. Rugg, M. D. Neuropsychologia 22, 435-443, 1984) the slow negative wave developing during the interval in which subjects waited for the final word was more negative from left-hemisphere electrodes, and the rhyme/non-rhyme differences in the ERPs following this word were greater over the right hemisphere. Neither of these asymmetries differed between the left and right-handers. Possible reasons for the occurrence of these ERP asymmetries during rhyme-matching are discussed, and it is suggested that the aspect(s) of linguistic processing tapped by this task, and influencing concurrently recorded ERPs, may be similarly lateralised in the brains of left- and right-handers.

Auditory Perception↗
PubMed1986

Lateral saccadic latencies and handedness.

Lateral saccadic latencies were determined in 18 right-handers and 18 left-handers. Within the right-handed group the mean latency was significantly shorter when looking from the left to the right (242.7 msec) than from right to left (265.0 msec), whereas no significant directional difference was found in the left-handed group. An age effect was also found with longer latencies being associated with increased age. These findings agree with those of Pirozzolo and Rayner (Neuropsychologia 18, 225-229, 1980) and provide further evidence of the pervasiveness of functional asymmetry in the human brain. The present findings suggest that motoric or central integrative mechanisms may contribute more to saccadic directional asymmetries than do perceptual differences.

Adult↗
PubMed1988

Handedness, prenatal stress and pregnancy complications.

Two hundred and ninety children aged 2 yr were assessed for laterality on a number of preference and dexterity tasks. The mothers were interviewed about their child's pre- and perinatal history. Information was also obtained from hospital records about pregnancy and delivery stress and complications. High risk pregnancies or pregnancy complications were not associated with an increase in the proportion of sinistrality. Only one of the stress factors (low Apgar) was associated with a decrease in the strength of dexterity. Since maternal and hospital reports were not in agreement in reporting complications, the validity of data generated from maternal reports is questioned.

Child, Preschool↗
PubMed1988

Is interhemispheric transfer related to handedness and gender?

Interhemispheric transfer was assessed by five motor, tactile and visual tasks which required the 48 subjects to compare stimuli presented simultaneously on both sides of the body midline. Non-right-handers performed significantly better than consistent right-handers on one motor and one tactile task. Females out-performed males on the visual task and on one tactile task. Better interhemispheric transfer performance by non-right-handers and by females may be related to the reportedly larger corpus callosum regions in these groups and also to the reportedly less strong lateralization of function.

Adult↗
PubMed1989

Influence of spatial frequency and handedness on hemispheric asymmetry in visually steady-state evoked potentials.

Recent suggestions on the involvement of the spatial frequency of visual stimuli in the hemispheric lateralization were investigated by recording steady-state evoked potentials in two groups of subjects: five right-handers and five left-handers. Sinusoidal gratings at spatial frequency of 0.5, 1, 3, 4, 6, 8, 10, 12 or 16 cpd were phase reversed at 4 Hz or 12 Hz. Evoked potentials recorded from temporal leads over each hemisphere were submitted to a FFT analysis. Results concern the amplitude of the fundamental component. In right-handers, the temporal frequency was the deciding factor of the lateralization: the evoked activities were greatest in the RH at 4 Hz and in the LH at 12 Hz. This effect was obvious for the range of spatial frequencies from 3-12 cpd. Results, discussed in terms of global/local information, suggested the existence of two transient and sustained systems. In left-handers, both the spatial and temporal parameters were relevant to the lateralization. A spatio-temporal interaction was observed which was reversed at 6 cpd.

Adult↗