Fractionating the multi-character processing deficit in developmental dyslexia: Evidence from two case studies

Varieties of developmental dyslexia in Greek children

“…This has been reported in a number of studies with transparent writing systems (e.g., Wimmer, 1993 The dyslexic children's spelling and nonword reading were overall less accurate than those of the TDR children, and they showed impairment in tasks of phonological awareness, rapid naming and letter report. These results have also been found for dyslexic children in many previous studies (e.g., Bowers & Wolf, 1993;Dubois et al, 2010;Hatcher, 1994;Moll et al, 2009;Snowling, 2000;Peyrin et al, 2012;Valdois et al, 2003). We can say then, that as a group the dyslexic children in the present study showed results in tasks of reading, spelling and literacy-related skills that are in line with those of previous studies.…”

“…Instead the child will be forced to rely on slow, serial processing (Ans et al, 1993;Bosse et al, 2007). As noted in the Introduction, the association of surface dyslexia and letter report difficulty has been reported before Dubois et al, 2010;Peyrin et al, 2012). A difference between previous studies and the present one is that multi-character processing was assessed using letter sounds in this study, and not letter names.…”

“…Alternatively, a phonological deficit will affect analytic processing and consequently nonword reading. Accordingly, studies have reported that surface dyslexic participants showed a letter report difficulty (c.f., Valdois et al, 2003;Dubois et al, 2010;Peyrin et al, 2012).…”

Sequential Versus Simultaneous Processing Deficits in Developmental Dyslexia

“…A number of case studies have now been reported (Dubois et al, 2010;Peyrin, Lallier, Baciu, Démonet, Le Bas, & Valdois, In press;Valdois et al, 2003;Valdois et al, In press) showing that dyslexic individuals (adults or children) with a single VA Span deficit may suffer from poor pseudoword reading abilities (reading accuracy and/or reading speed) in spite of any difficulties in "pure auditory" phonological processing skills.…”

Sustained attention, attentional selectivity, and attentional capacity across the lifespan

“…In the pioneering study, Duncan et al (1999) showed how analysis of partial-and whole-report performance in terms of the parameters defined by TVA enables a very specific measurement of attention deficits in visual neglect patients (see also Bublak et al, 2005;. TVA-based assessment has now been used in studies of simultanagnosia (Duncan et al, 2003), integrative agnosia (Gerlach, Marstrand, Habekost & Gade, 2005), developmental dyslexia (Dubois et al, 2010), alexia (Habekost & Starrfelt, 2006;Starrfelt, Habekost & Gerlach, 2010;Starrfelt, Habekost & Leff, 2009), Huntington's disease (Finke et al, 2007), Alzheimer's disease (Bublak, Redel & Finke, 2006;Bublak et al, 2009;Redel et al, 2012), and the effects of stroke in particular parts of the brain (Habekost & Bundesen, 2003;Habekost & Rostrup, 2006, 2007Peers et al, 2005;see Habekost & Starrfelt, 2009, for a review). TVAbased assessment enables the estimation of parameters related to the span of VSTM (storage capacity of K objects), the rate of encoding into VSTM (processing capacity of C objects/s), the perceptual threshold (minimum effective exposure duration of t 0 ms), and the efficiency of selecting targets rather than distractors (selectivity α, defined as the attentional weight of a distractor divided by the attentional weight of a target).…”