In this study we investigated twelve cases of "mixed dysgraphia", a spelling impairment where regular words are spelt better than either ambiguous words or regular nonwords. Two explanations of mixed dysgraphia were formerly offered by Luzzatti et al. (1998): (i) a double functional lesion of the Orthographic Output Lexicon (or damage to its access) and of the Acoustic-to-Phonological Conversion; (ii) some kind of interaction/summation between lexical and sublexical spelling routes when processing regular words. We first analysed whether a double functional lesion was sufficient to explain the mixed dysgraphia, checking acoustic-to-phonological conversion by means of the Repetition of words and nonwords: the answer was positive in 5 cases and uncertain in 3. We tested the remaining 4 cases to see if there was an interaction between lexical and sublexical processing of regular words, quantifying for each patient, on a probabilistic basis, the separate contribution of the residual lexical and sublexical resources. We investigated whether the processing along these routes was simultaneous but independent ("independent cooperation") or if instead there was “interaction”, i.e. the simultaneous activity led to an added increase of efficiency over and above the mere combination of separate success probabilities. For one case the processing along the two routes was independent, in the other 3 cases an interaction resulted. Following the same approach, we found that for the 5 cases with a double functional lesion, the observed success on regular word spelling was higher than that expected on a probabilistic basis, but the interpretation of this finding was different

Laiacona, M., Capitani, E., Zonca, G., Scola, I., Saletta, P., & Luzzatti, C. (2009). Integration of lexical and sublexical processing in the spelling of regular words: a multiple single-case study in Italian dysgraphic patients. CORTEX, 45(7), 804-815 [10.1016/j.cortex.2008.10.011].

Integration of lexical and sublexical processing in the spelling of regular words: A multiple single-case study in Italian dysgraphic patients

LUZZATTI, CLAUDIO GIUSEPPE
2009

Abstract

In this study we investigated twelve cases of "mixed dysgraphia", a spelling impairment where regular words are spelt better than either ambiguous words or regular nonwords. Two explanations of mixed dysgraphia were formerly offered by Luzzatti et al. (1998): (i) a double functional lesion of the Orthographic Output Lexicon (or damage to its access) and of the Acoustic-to-Phonological Conversion; (ii) some kind of interaction/summation between lexical and sublexical spelling routes when processing regular words. We first analysed whether a double functional lesion was sufficient to explain the mixed dysgraphia, checking acoustic-to-phonological conversion by means of the Repetition of words and nonwords: the answer was positive in 5 cases and uncertain in 3. We tested the remaining 4 cases to see if there was an interaction between lexical and sublexical processing of regular words, quantifying for each patient, on a probabilistic basis, the separate contribution of the residual lexical and sublexical resources. We investigated whether the processing along these routes was simultaneous but independent ("independent cooperation") or if instead there was “interaction”, i.e. the simultaneous activity led to an added increase of efficiency over and above the mere combination of separate success probabilities. For one case the processing along the two routes was independent, in the other 3 cases an interaction resulted. Following the same approach, we found that for the 5 cases with a double functional lesion, the observed success on regular word spelling was higher than that expected on a probabilistic basis, but the interpretation of this finding was different
No
Articolo in rivista - Articolo scientifico
Scientifica
mixed dysgraphia; lexical-sublexical integration
English
Laiacona, M., Capitani, E., Zonca, G., Scola, I., Saletta, P., & Luzzatti, C. (2009). Integration of lexical and sublexical processing in the spelling of regular words: a multiple single-case study in Italian dysgraphic patients. CORTEX, 45(7), 804-815 [10.1016/j.cortex.2008.10.011].
Laiacona, M; Capitani, E; Zonca, G; Scola, I; Saletta, P; Luzzatti, C
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/10281/5354
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