منابع مشابه
Visual search deficits are independent of magnocellular deficits in dyslexia.
The aim of this study was to investigate the theory that visual magnocellular deficits seen in groups with dyslexia are linked to reading via the mechanisms of visual attention. Visual attention was measured with a serial search task and magnocellular function with a coherent motion task. A large group of children with dyslexia (n = 70) had slower serial search times than a control group of typ...
متن کاملSelective magnocellular deficits in dyslexia: a "phantom contour" study.
A technique by Rogers-Ramachandran and Ramachandran [Vis. Res. 38 (1998) 71-77] was adapted to evaluate magnocellular (M) and parvocellular (P) visual processing efficiency, with identical task structure, in normal and dyslexic children. A battery of phonological, orthographic and cognitive tasks was administered to assess reading ability and component reading skills in both groups. For the vis...
متن کاملMagnocellular reading and dyslexia
It is pointed out that the question of the potential role of magnocellular neurons in reading is distinctly separate from the question of whether or not a magnocellular deficit is the cause of dyslexia. These two issues should not be confused. With regard to the second, the data do not at present favor the hypothesis that dyslexia is the result of a magnocellular deficit.
متن کاملDyslexia: the link with visual deficits.
Some research reports suggest that visual anomalies may have a causative role in dyslexia, and on this basis certain forms of therapy have been proposed. Recently, we have published the initial results of a matched group study which found dyslexia to be associated with binocular instability, reduced amplitude of accommodation, and reduced contrast sensitivity for both low spatial frequencies an...
متن کاملDeficits in Magnocellular Pathway in Developmental Dyslexia: A Functional Magnetic Resonance Imaging-Electroencephalography Study
Background: Magnocellular deficit theory is among the different hypotheses that have been proposed to explain the pathophysiology of developmental dyslexia (DD). Dysfunction of the magnocellular system in DD has been investigated using mainly visual evoked potentials (VEPs), particularly transient VEPs, although recently abnormal steadystate VEPs have also been reported. The brain regions respo...
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ژورنال
عنوان ژورنال: Brain
سال: 2003
ISSN: 1460-2156
DOI: 10.1093/brain/awg217