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At least 1,369 records · Page 76Linked to original sources
PubMed1986

Left-handedness and variant patterns of cerebral organization: a case study.

A left-middle-cerebral artery infarct in a 51-year-old, nonfamilial left-handed man failed to produce aphasia, but did result in imparied visuospatial functioning, construction dyspraxia, mild limb dyspraxia, and temporal/sequential skill dysfunction. The patient also had severe right-sided sensory and body neglect, right-sided hemiparesis, and mildly dysarthric speech. These neuropsychological findings strongly suggest a reversed pattern of cerebral organization. Posterior anatomical size asymmetries were also reversed, in that the right occipitalparietal area was somewhat larger than the left. However, this patient's limb dyspraxia followed no known pattern of cerebral organization. His dyspraxia suggests that control of complex motor skills in nonfamilial left-handers may remain a left-hemisphere or bilaterally represented function, even when other cognitive abilities are reversed.

Journal Article↗
PubMed1992

Variations in the intertubercular sulcus of the humerus related to handedness.

Measurements of the maximum width and depth of the intertubercular sulcus (ITS) and the angles formed by the medial and lateral walls of the ITS with the plane of its floor were recorded in 200 adult human humeri, 100 each from the right and left sides. The ITS was more often wider and its medial wall formed a more acute angle with the plane of its floor in right-sided humeri. A supratubercular ridge on the humerus was present more frequently on the right than on the left. The presence of this ridge is probably more necessary on the right to prevent medial displacement of the long head of the biceps tendon from the ITS. The greater thrust exerted by the taut tendon of the long head of the biceps in the upper limb that is used preferentially probably induces structural differences in the ITS.

Adult↗
PubMed1992

Handedness and spatial ability in children: further support for Geschwind's hypothesis of "pathology of superiority" and for Annett's theory of intelligence.

Spatial ability of 60 left-handed and 60 right-handed school children was investigated using a battery of nine tasks. The results do not agree with Levy's (1969, 1976) theory predicting spatial inferiority of left-handed individuals. Instead, higher performance by left-handed children provided further support for Annett's (Annett & Manning, 1989) theory on intelligence and for Geschwind's (Geschwind & Galaburda, 1985) hypothesis of "pathology of superiority." The distinction of left-handed and right-handed individuals into familial and nonfamilial groups appeared to be psychologically equivocal according to our results.

Aptitude↗