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PubMed · 6851595

Hemispheric interaction in visual field asymmetry.

D B Boles
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Abstract

A survey of previous literature suggests that asymmetries obtained in visual field recognition are larger when stimuli are presented bilaterally than when presented unilaterally. Three experiments confirm the existence of the effect, eliminate a number of published hypotheses used to explain it, and support a mechanism of hemispheric interaction in processing information. Both theoretical and methodological implications are discussed.

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Dominance, CerebralFemaleFixation, OcularForm PerceptionHumansMaleMental RecallOrientationPattern Recognition, VisualReadingJournal ArticleResearch Support, U.S. Gov't, P.H.S.

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BibTeXRIS

D B Boles. 1983. Hemispheric interaction in visual field asymmetry.. https://doi.org/10.1016/s0010-9452(83)80053-7

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A recent prospective analysis on writer's cramp showed that up to 44.6% of patients in a series of 65 presented mirror dystonia, defined as involuntary movements of the resting hand, abnormal posture, tremor, and jerks occurring while writing with the opposite hand. A clinical case is presented, with videotape evidence of right-handed writer's cramp, with mirror movements elicited while writing using either hand. Functional magnetic resonance imaging studies are compared both to those of a normal patient and to those from a patient with writer's cramp but lacking mirror dystonia. Widespread bilateral activation of cortical motor areas contralateral to the mirror movements in patients with writer's cramp and mirror movements suggests, that bilateral activation of the primary motor cortex may account for the appearance of these mirror movements. Further studies need to be conducted to determine whether mirror movements in dystonic patients appear as a result of loss of intra- and/or interhemispheric cortical inhibition or are simply a consequence of the sustained effort these patients need to exert while writing using a dystonic hand.

Dominance, Cerebral↗