This study of 34 adults with Down's syndrome found that right-handed subjects exhibited no lateral advantage in dihaptic shape-matching, whereas left-handed subjects displayed an expected left-hand advantage. In a visual field dot enumeration task, both groups exhibited left-field superiority. Results indicate that subjects' atypical cerebral…

This replication study with 96 highly gifted and 192 less gifted control subjects (all 12 years old) found the highly gifted (students with extremely high scores on the Scholastic Aptitude Test) were disproportionately male. It did not find that the highly gifted were more likely to be left handed or to have allergies. (Author/DB)

This study compared hand preference and motor skills in 20 children with autism with 40 children either typically developing or with developmental delays. Results indicated that the lack of hand preference in children with autism was not a function of their cognitive delay or a lack of motor skills. Results supported the bilateral brain…

Used teacher questionnaires to examine incidence of left-handedness in nearly 2,800 Singaporean children, racial differences in this left-handed population, and educational provisions in preschool and primary school. Findings indicated that 7.5% of preschoolers and 6.3% of primary children were left-handed, with a higher proportion being Chinese…

The present study examined the relationship between word concreteness and word frequency using event-related potential (ERP) measurements during a lexical decision task. Potential effects of concreteness in the processing of verbs were also examined. ERPs were recorded from 119 scalp electrodes in 23 right-handed participants. The results showed…

In normal right-handed subjects language production usually is a function of the left brain hemisphere. Patients with aphasia following brain damage to the left hemisphere have a considerable potential to compensate for the loss of this function. Sometimes, but not always, areas of the right hemisphere which are homologous to language areas of the…

A study of children (ages 3-5 and 11-13) with autism (n=35), learning disabilities (n=26), or no disabilities (n=90) found that the nondisabled children were more lateralized than others in degree and consistency of handedness. No evidence was found of a dissociation of hand skill and hand preference in children with autism, compared to others.…

Discusses how handedness at one level may give rise to handedness at another. Presents examples from plants and animals, molecules, atoms, to elementary particles. Examines the chiral symmetry in life and when it starts. (YP)

Hand preference during signing was examined longitudinally in nine very young children with deaf parents. These children generally showed a distinct and persistent hand preference in their signing, beginning with the production of their first signs. (14 references) (VWL)

The ratio between the 2nd and 4th fingers (2D:4D)--a potential proxy for prenatal testosterone (T) exposure--shows a sex difference, with males usually having lower mean values; the latter potentially indicates higher prenatal T exposure. We studied relations between 2D:4D and competencies in the domains of counting, number knowledge, and…

The aim of our study was to investigate possible relationships between writing and drawing performance of school-aged children, in order to compare the two skills at the within-individual level. The sample consisted of 182 right- and left-handed children, aged 8 to 12 years. Children were examined by the Greek adaptation of the Luria-Nebraska…

This study describes the linguistic and neuropsychological findings in three right-handed patients with crossed conduction aphasia. Despite the location of the lesion in the right hemisphere, all patients displayed a combination of linguistic deficits typically found in conduction aphasia following analogous damage to the left hemisphere.…

This paper estimates the effects of handedness on earnings. Augmenting a conventional earnings equation with an indicator of left-handedness shows there is a positive effect on male earnings with manual workers enjoying a slightly larger premium. These results are inconsistent with the view that left-handers in general are handicapped either…

Identified subjects' handedness and family handedness (genetic variables) and college major (environmental variable); and tested subjects on the Vandenberg Mental Rotation Test. Found that right-handed females with non-right-handed relatives and with science or math majors outperformed other females and equaled the performance of males on the…

Discusses sexual orientation using the analogy of handedness. Points out the presence of diverse sexual behavior and homosexuality among living species and focuses on human behavior. Encourages discussions among biology teachers on the origins of sexual orientation. (Contains 27 references.) (YDS)