A stimulus-centered reading disorder for words and numbers: Is it neglect dyslexia?

Arduino, Lisa S.; Daini, Roberta; Silveri, Maria Caterina

doi:10.1080/13554790500263503

Cited by 16 publications

(15 citation statements)

References 47 publications

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“…We speculate that in those patients the number of substitutions should reduce as a function of letter spacing. In agreement with this conjecture, a patient RCG, described by Arduino et al (2005), shows a predominance of substitution errors in reading (93% of 106 errors on 240 words) and halves the number of errors when letter spacing is increased (44 on 240, result unpublished in the cited study).…”

Section: Discussionsupporting

confidence: 79%

“…As both types of disrupted mechanisms can occur in the same patient, each deficit can be predicted on the basis of the observed errors and vice versa. In particular, when patients with neglect dyslexia and without USN are found, they should show a predominance of substitution errors and, in fact, this is exactly what has been found (see e.g., Arduino, Daini, & Silveri, 2005;Haywood & Coltheart, 2001;Katz & Sevush, 1989;Patterson & Wilson, 1990). We speculate that in those patients the number of substitutions should reduce as a function of letter spacing.…”

Section: Discussionmentioning

confidence: 79%

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Two different mechanisms for omission and substitution errors in neglect dyslexia

2011

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Neglect dyslexia is a reading disorder often associated with right-sided brain lesions. In reading single words, errors are mostly substitutions or omissions of letters that occupy the left-sided positions. Typically, these errors have been thought to depend on a single mechanism. Conversely, we propose that they are due to different mechanisms. In particular, a visuo-spatial mechanism is responsible for omissions and a perceptual integration process for substitution errors. We measured the performance of six patients with both neglect and neglect dyslexia, analyzing their reading errors as a function of letter spacing. According to our conjecture, letter spacing should increase omissions by moving part of the string further in the unattended space, while it should reduce substitutions by restoring the integration processes. Furthermore, we predict that letter spacing should be more effective with pseudowords compared to words, in that in this latter case lexical effects are supposed to influence attentional and perceptual processes. Accordingly, we found that for pseudowords only the two types of errors are differently affected by this manipulation and only omissions correlate with the severity of the disorder in visuo-spatial tasks.

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Section: Discussionsupporting

confidence: 79%

Section: Discussionmentioning

confidence: 79%

Two different mechanisms for omission and substitution errors in neglect dyslexia

2011

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“…In our patient the side of visual field impairment and of neglect dyslexia dissociated, which is comparable to left-hemisphere damaged patients. Finally, the present case is reminiscent of the patient described by Arduino et al (2005), who following bilateral temporo-occipital damage presented a stimulus-centred left neglect dyslexia. This patient showed right upper quadrantanopia with no signs of neglect other than in reading and cerebral hypoperfusion that was more important in the left than the right hemisphere, suggesting that his left-hemispheric lesion may have caused his reading impairment.…”

Section: Discussionmentioning

confidence: 97%

“…Among the classic paper-and-pencil tests used to assess neglect line bisection appears to be the only significant predictor of neglect dyslexia (Ptak et al, 2012;Reinhart et al, 2013). Nevertheless, several case studies of 'pure' neglect dyslexia (i.e., dyslexia without other neglect symptoms; Arduino et al, 2005;Haywood and Coltheart, 2001;Riddoch et al, 1990) or of dyslexia that is dissociated from other signs of neglect (e.g., left dyslexia with right neglect in cancellation tasks; Costello and Warrington, 1987;Cubelli et al, 1991;Humphreys and Riddoch, 1995) have been reported. However, all patients classified as 'pure' neglect dyslexics had at least partial visual field loss that may have influenced the reading disorder, in particular if combined with subclinical symptoms of neglect.…”

Section: Introductionmentioning

confidence: 99%

The role of parieto-temporal connectivity in pure neglect dyslexia

Ptak

Pietro

Pignat³

2016

Brain Research

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a b s t r a c tThe initial stages of reading are characterised by parallel and effortless access to letters constituting a word. Neglect dyslexia is an acquired reading disorder characterised by omission or substitution of the initial or the final letters of words. Rarely, the disorder appears in a'pure' form that is, without other signs of spatial neglect. Neglect dyslexia is linked to damage involving the inferior parietal lobe and regions of the temporal lobe, but the precise anatomical basis of the pure form of the disorder is unknown. Here, we show that pure neglect dyslexia is associated with decreased structural connectivity between the inferior parietal and lateral temporal lobe. We examined patient DM, who following bilateral occipito-parietal damage presented left neglect dyslexia together with right visual field loss, but no signs of spatial neglect. DM's reading errors were affected by word length and were much more frequent for pseudowords than for existing words. Most errors were omissions or substitutions of the first or second letter, and the spatial distribution of errors was similar for stimuli presented left or right of fixation. The brain lesions of DM comprised the inferior and superior parietal lobule as well as the cuneus and precuneus of the left hemisphere, and the angular gyrus and lateral occipital cortex of the right hemisphere. Diffusion tensor imaging revealed bilateral decrease of fibre tracts connecting the inferior parietal lobule with the superior and middle temporal cortex. These findings suggest that parieto-temporal connections play a significant role for the deployment of attention within words during reading.

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“…Absence of a cueing effect has also been found in a patient, R.C.G., who has problems reading the beginnings of words(Arduino, Daini, & Silveri, 2005). However, R.C.G.…”

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confidence: 91%

Examination of the split fovea theory in a case of pure left hemialexia

Siéroff

Lavidor

2007

Cognitive Neuropsychology

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To address the extent to which the visual foveal representation is split, we examine the case of a patient, M.B., suffering from a left mesial occipital lesion and presenting a pure left hemialexia and a right hemianopia with a spared area of the macula. Reading performance on tachistoscopically presented four-letter words and pseudowords in the spared area of the right visual field was significantly better than reading performance in the intact left visual field. Reading performance in the spared area of the right visual field was also significantly better than reading performance of stimuli centred on the fovea. Moreover, a length effect was found only in the left half of pseudowords centred on the fovea, but not in the right half (up to five letters). These differences in reading efficiency between the left and right halves of the foveal region militates in favour of the split fovea theory and cannot be explained by the bilateral projection theory.

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A stimulus-centered reading disorder for words and numbers: Is it neglect dyslexia?

Cited by 16 publications

References 47 publications

Two different mechanisms for omission and substitution errors in neglect dyslexia

Two different mechanisms for omission and substitution errors in neglect dyslexia

The role of parieto-temporal connectivity in pure neglect dyslexia

Examination of the split fovea theory in a case of pure left hemialexia

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