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Reverse-process sinistral cursive in dextrads: a mirror-writing variant.

Abstract

A loop executed clockwise in conventional (left to right) cursive writing is performed counterclockwise in classical (right to left) mirror writing. This rotational reversal appears integral to and inseparable from the mirror-writing phenomenon. Yet in Reverse Process Sinistral Cursive, which proceeds left to right, the rotational component escapes its embeddedness in the conventional mirror form and finds individual, overt expression. The product represents a compromise between the competing and often contradictory demands of innate rotational tendencies, legibility, continuity of movement, and conventional writing style. In dextrads, it reflects difficulty in meeting the unaccustomed demands of translating right-sided movement patterns into left-handed writing performance.

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BibTeXRIS

T S Ball, B Kesterson. 1982. Reverse-process sinistral cursive in dextrads: a mirror-writing variant.. https://doi.org/10.2466/pms.1982.55.2.648

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Bilateral mirror writing movements (mirror dystonia) in a patient with writer's cramp: functional correlates.

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↗