Multiple Causal Links Between Magnocellular-Dorsal Pathway Deficit and Developmental Dyslexia.

@article{Gori2016MultipleCL,
  title={Multiple Causal Links Between Magnocellular-Dorsal Pathway Deficit and Developmental Dyslexia.},
  author={Simone Gori and Aaron R. Seitz and Lucas Ronconi and Sandro Franceschini and Andrea Facoetti},
  journal={Cerebral cortex},
  year={2016},
  volume={26 11},
  pages={
          4356-4369
        }
}
Although impaired auditory-phonological processing is the most popular explanation of developmental dyslexia (DD), the literature shows that the combination of several causes rather than a single factor contributes to DD. Functioning of the visual magnocellular-dorsal (MD) pathway, which plays a key role in motion perception, is a much debated, but heavily suspected factor contributing to DD. Here, we employ a comprehensive approach that incorporates all the accepted methods required to test… Expand
The current status of the magnocellular theory of developmental dyslexia
  • J. Stein
  • Medicine, Psychology
  • Neuropsychologia
  • 2019
TLDR
It is argued that true DD is characterised by poor temporal processing, hence impaired visual and auditory sequencing, that is caused by impaired development of transient/magnocellular (M-) systems throughout the brain. Expand
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TLDR
The first evidence of a methodologically and statistically sound approach for identifying EPs for DD to be exploited as a solid alternative basis to clinical phenotypes in neuroscience is provided. Expand
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TLDR
The results provide strong support for the idea that auditory processing difficulties in dyslexia, along with visual and sensorimotor deficits, have a common neurodevelopmental cause. Expand
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TLDR
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Orthographic processing deficits in developmental dyslexia: Beyond the ventral visual stream
TLDR
It is argued that efficient processing in MOG in the course of reading acquisition is critical for the development of effortless fast visual word recognition in the VWFA. Expand
What is Developmental Dyslexia?
  • J. Stein
  • Psychology, Medicine
  • Brain sciences
  • 2018
TLDR
It is argued that this theory is set at too high a cognitive level to be explanatory; it is discussed how the ‘magnocellular theory’ attempts to do this in terms of slowed and error prone temporal processing which leads to dyslexics’ defective visual and auditory sequencing when attempting to read. Expand
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References

SHOWING 1-10 OF 160 REFERENCES
Magnocellular-dorsal pathway and sub-lexical route in developmental dyslexia
TLDR
Investigation of the visual M-D and parvocellular-ventral pathways in dyslexic and in chronological age and IQ-matched normally reading children by measuring temporal (frequency doubling illusion) and static stimuli sensitivity, respectively showed that a M-d deficit might impair the sub-lexical mechanisms that are critical for reading development. Expand
Perceptual learning as a possible new approach for remediation and prevention of developmental dyslexia
TLDR
The crucial visual attention deficits that are causally linked to DD could be strongly reduced by training the magnocellular-dorsal pathway with the PL, and learning to read for children with DD would not be anymore such a difficult task. Expand
Impaired neuronal timing in developmental dyslexia—the magnocellular hypothesis
Developmental dyslexia is not just a literacy problem. Dyslexics' reading and spelling difficulties are but two of a much larger number of differences between dyslexic and normal readers. TheExpand
Abnormal Visual Motion Processing Is Not a Cause of Dyslexia
TLDR
Using fMRI, this work demonstrates in typical readers a relationship between reading ability and activity in area V5/MT during visual motion processing and finds lower activity for dyslexic children compared to age-matched controls and provides strong evidence that visual magnocellular dysfunction is not causal to dyslexia but may instead be consequential to impoverished reading. Expand
Sensitivity to dynamic auditory and visual stimuli predicts nonword reading ability in both dyslexic and normal readers
TLDR
The dissociation observed in the performance of dyslexic individuals on different auditory tasks suggests a sub-modality division similar to that already described in the visual system, which may provide a non-linguistic means of identifying children at risk of reading failure. Expand
How the visual aspects can be crucial in reading acquisition? The intriguing case of crowding and developmental dyslexia.
TLDR
The aim is to review the literature supporting the important role of crowding in developmental dyslexia and propose new possible studies in order to clarify whether the observed excessive crowding could be a cause rather than an effect of DD. Expand
Reading into neuronal oscillations in the visual system: implications for developmental dyslexia
TLDR
The general temporal sampling difficulties in dyslexic subjects may impact reading not necessarily by causing phonological deficits, but by affecting the spatio-temporal parsing of the visual input within the visual system before these signals are used for letter and word recognition. Expand
M-stream deficits and reading-related visual processes in developmental dyslexia.
TLDR
The purpose of the present article was to characterize reading-related perceptual processes that may link the visual deficits in developmental dyslexia to reading problems. Expand
A Causal Link between Visual Spatial Attention and Reading Acquisition
TLDR
The present 3 year longitudinal study shows that prereading attentional orienting--assessed by serial search performance and spatial cueing facilitation--captures future reading acquisition skills in grades 1 and 2 after controlling for age, nonverbal IQ, speech-sound processing, and nonalphabetic cross-modal mapping. Expand
The visual magnocellular-dorsal dysfunction in Chinese children with developmental dyslexia impedes Chinese character recognition
TLDR
It is proposed that the M-D impairment present in some but not all dyslexics might influence global recognition of Chinese characters in this subgroup of children with DD, which might be implicated in their difficulties in learning to read. Expand
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