August 2010
Volume 10, Issue 7
Free
Vision Sciences Society Annual Meeting Abstract  |   August 2010
On the Relationship between Magnocellular Pathway and Automatic Attentional Orienting: Evidences from Developmental Dyslexia
Author Affiliations
  • Andrea Facoetti
    Dipartimento di Psicologia Generale, Università di Padova, Italy
    Unità di Neuropsicologia dello Sviluppo, Istituto Scientifico “E. Medea” di Bosisio Parini, Lecco, Italy
  • Milena Ruffino
    Unità di Neuropsicologia dello Sviluppo, Istituto Scientifico “E. Medea” di Bosisio Parini, Lecco, Italy
  • Simone Gori
    Dipartimento di Psicologia Generale, Università di Padova, Italy
  • Anna Bigoni
    Unità di Oculistica, Istituto Scientifico “E. Medea” di San Vito al Tagliamento, Pordenone, Italy
  • Mariagrazia Benassi
    Dipartimento di Psicologia, Università di Bologna, Italy
  • Roberto Bolzani
    Dipartimento di Psicologia, Università di Bologna, Italy
  • Massimo Molteni
    Unità di Neuropsicologia dello Sviluppo, Istituto Scientifico “E. Medea” di Bosisio Parini, Lecco, Italy
  • Paolo Cecchini
    Unità di Oculistica, Istituto Scientifico “E. Medea” di San Vito al Tagliamento, Pordenone, Italy
Journal of Vision August 2010, Vol.10, 281. doi:10.1167/10.7.281
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      Andrea Facoetti, Milena Ruffino, Simone Gori, Anna Bigoni, Mariagrazia Benassi, Roberto Bolzani, Massimo Molteni, Paolo Cecchini; On the Relationship between Magnocellular Pathway and Automatic Attentional Orienting: Evidences from Developmental Dyslexia. Journal of Vision 2010;10(7):281. doi: 10.1167/10.7.281.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Although developmental dyslexia (DD) is frequently associate to a linguistic deficit, the underlying neurobiological cause remains unclear. One prominent vision science hypothesis suggests a specific deficit in magnocellular (M) pathway in DD. However, a recent hypothesis proposes that M-deficits contribute to the etiology of phonological decoding ability (i.e., new word and nonword reading), impairing selectively the attentional orienting process onto letter string. Thus, a specific M-pathway impairment in association with an attentional orienting disorder in DD children with phonological decoding deficit was specifically predicted by this neurobiological hypothesis. In the present study we investigated the M-pathway and attentional orienting in 18 dyslexic (10 with phonological decoding deficit) and in 29 chronological age and IQ matched normally reading children by measuring dynamic stimuli sensibility (i.e., spatial frequency doubling illusion) and the time-course of automatic covert attention (i.e., target detection effect at different SOAs of a non-predictive and peripheral spatial cue), respectively. The results showed a specific deficit of the M-pathway task in dyslexic with phonological decoding deficit. More importantly, the same group of dyslexics with M-deficit presented a sluggish attentional orienting: attentional facilitation was present at longer cue-target SOAs compared with normal readers. These results highlight that a M-deficit linked to a parietal-attentional dysfunction might impair the phonological decoding mechanisms that are critical for reading acquisition.

Facoetti, A. Ruffino, M. Bigoni, A. Benassi, M. Bolzani, R. Molteni, M. Cecchini, P. (2010). On the Relationship between Magnocellular Pathway and Automatic Attentional Orienting: Evidences from Developmental Dyslexia [Abstract]. Journal of Vision, 10(7):281, 281a, http://www.journalofvision.org/content/10/7/281, doi:10.1167/10.7.281. [CrossRef]
Footnotes
 LL was supported by a Michael Smith Foundation for Health Research Post-doctoral Fellowship. JB was supported by a Michael Smith Foundation for Health Research Senior Scholar Award and a Canada Research Chair.
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