Article

Acquired spatial dyslexia is a reading disorder frequently occurring after left
or right posterior brain lesions. This article describes several types of spatial
dyslexia with an attentional approach. After right posterior lesions, patients
show left neglect dyslexia with errors on the left side of text, words, and
non-words. The deficit is frequently associated with left unilateral spatial
neglect. Severe left neglect dyslexia can be detected with unlimited exposure
duration of words or non-words. Minor neglect dyslexia is detected with brief
presentation of bilateral words, one in the left and one in the right visual
field (phenomenon of contralesional extinction). Neglect dyslexia can be
explained as a difficulty in orienting attention to the left side of verbal
stimuli. With left posterior lesions, spatial dyslexia is also frequent but
multiform. Right neglect dyslexia is frequent, but right unilateral spatial
neglect is rare. Attentional dyslexia represents difficulty in selecting a
stimulus, letter or word among other similar stimuli; it is a deficit of
attentional selection, and the left hemisphere plays a crucial role in selection.
Two other types of spatial dyslexia can be found after left posterior lesions:
paradoxical ipsilesional extinction and stimulus-centred neglect dyslexia.
Disconnections between left or right parietal attentional areas and the left
temporal visual word form area could explain these deficits. Overall, a model of
attention dissociating modulation, selection control, and selection positioning
can help in understanding these reading disorders.
CI - Copyright (c) 2016. Published by Elsevier Masson SAS.

Langue : ANGLAIS