Réduplications et omissions graphiques chez des patients atteints d'une lésion hémisphérique droite

Afferent Dysgraphia and the Role of Vision in Handwriting

“…Most errors involved letters with repeated strokes: m, n, u, v. For these letters, the error frequency was higher than 10%. This finding confirms the observations made by Lebrun (1972), Hecaen and Marcie (1974) and Ellis et al (1987) and is consistent with the diagnosis of "afferent dysgraphia". Smyth and Silvers (1987) showed that normal subjects produced afferent-ty pe errors under two experimental conditions: (a) when writing with their eyes closed and (b) when writing with their eyes open while performing a simultaneous articulatory task.…”

“…Left neglect related phenomena: (a) writing is crowded onto the right side of the page leaving an excessively wide "margin" on the left side (Hecaen et al 1963); (b) patients omit to cross t's and dot i's more often if they are in the left half of the words than if they are in the right (Ellis, Young, & Flude, 1987). Afferent dysgraphic errors: patients produce omissions and duplications of strokes and letters (Lebrun & Rubio, 1972). They may add a fourth downstroke to the letter m or omit the second downstroke of the letter n (Lebrun, 1976); furthermore they may write RABIT instead of RABBIT or DEEEP instead of DEEP (Ellis et al, 1987).…”

Disturbances of written language and associated abilities following damage to the right hemisphere

“…Since the writing errors obviously do not result from acquired dysorthographia -i.e., impaired command of spelling -what causes them? The origin of the errors has been found to be a disorder of the visual and kinesthetic control of the act of writing (Lebrun & Lebrun, 1971;Lebrun & Rubio, 1972a/1972bLebrun, 1974Lebrun, , 1976. The patient knows how the words should be spelled, but he is no longer able to ascertain whether he is implementing this spelling correctly in his writing, especially when the words contain sequences of similar strokes (as in m or«) or similar loops (as in ee or oo).…”

Afferent Dysgraphia after Right Cerebral Stroke: An Autonomous Syndrome?

“…Afferent dysgraphia is an acquired deficit of handwriting characterized by omissions and duplications of strokes and letters (Lebrun, 1976). When writing in cursive, patients may add a fourth downstroke to the letter m or omit the second downstroke of the letter n (Lebrun & Rubio, 1972;Cubelli & Lupi, 1999); when writing in uppercase print, they may produce the letter E with four horizontal lines or the letter B with only one arch (Ellis, Young, & Flude, 1987). Further, they may write ''ladder'' with three d's or hammer with only one m (Ellis et al, 1987).…”