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Writing without Graphic Motor Patterns: A Case of Dysgraphia for Letters and Digits Sparing Shorthand Writing

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Published in Cognitive Neuropsychology. 1997, vol. 14, no. 5, p. 743-763
Abstract Thi s pape r report s th e cas e of a patien t (H P) wh o present s a dysgraphi a affectin g th e productio n of letter s an d digit s whil e sparin g shorthan d writing . H P’ s writin g impairmen t is two-fold . O n on e hand , HP produce s systemati c lette r substitution s affectin g exclusivel y lower-cas e letter s b , p , d , and q . Suc h confusion s ar e als o observe d in task s assessin g th e menta l imager y of letter s an d th e processin g of visuall y presented , isolate d letters . Thi s defici t is attribute d to a circumscribe d disruptio n of allographi c representa tions . On th e othe r hand , H P ca n writ e correctl y forme d letter s an d digit s bu t th e productio n of thes e symbol s is slo w an d nonfluent . Thi s disturbanc e wa s investigate d by usin g a digitisin g table t to recor d movement s performe d in grapho-moto r production . Th e result s of th e analysi s of tempora l an d kinemati c indice s sugges t tha t graphi c moto r pattern s of letter s an d digit s ar e no longe r availabl e to thi s patient , wherea s moto r pattern s underlyin g th e productio n of shorthan d see m unaffected . It is suggeste d tha t ther e ar e tw o way s fo r producin g spatiall y well-forme d symbols . O ne rout e is mediate d by graphi c motor pattern s an d th e other by a motor planning syste m tha t woul d be use d in othe r tasks involvin g the generatio n of 2D trajectorie s (a s in drawin g or in tracing unfamilia r symbols) .
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Research groups Psycholinguistique
Acquisition et troubles du langage
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ZESIGER, Pascal Eric, MARTORY, Marie-Dominique, MAYER, Eugène. Writing without Graphic Motor Patterns: A Case of Dysgraphia for Letters and Digits Sparing Shorthand Writing. In: Cognitive Neuropsychology, 1997, vol. 14, n° 5, p. 743-763. https://archive-ouverte.unige.ch/unige:80955

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