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Simos PG, Rezaie R, Papanicolaou AC, et al. Does IQ affect the functional brain network involved in pseudoword reading in students with reading disability? A magnetoencephalography study. Front Hum Neurosci. 2014;7:932doi: 10.3389/fnhum.2013.00932.
Simos, P. G., Rezaie, R., Papanicolaou, A. C., & Fletcher, J. M. (2014). Does IQ affect the functional brain network involved in pseudoword reading in students with reading disability? A magnetoencephalography study. Frontiers in human neuroscience, 7932. https://doi.org/10.3389/fnhum.2013.00932
Simos, Panagiotis G, et al. "Does IQ affect the functional brain network involved in pseudoword reading in students with reading disability? A magnetoencephalography study." Frontiers in human neuroscience vol. 7 (2014): 932. doi: https://doi.org/10.3389/fnhum.2013.00932
Simos PG, Rezaie R, Papanicolaou AC, Fletcher JM. Does IQ affect the functional brain network involved in pseudoword reading in students with reading disability? A magnetoencephalography study. Front Hum Neurosci. 2014 Jan 08;7:932. doi: 10.3389/fnhum.2013.00932. eCollection 2014. PMID: 24409136; PMCID: PMC3884211.
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Front Hum Neurosci. 2014 Jan 08;7:932. doi: 10.3389/fnhum.2013.00932. eCollection 2014.

Does IQ affect the functional brain network involved in pseudoword reading in students with reading disability? A magnetoencephalography study.

Frontiers in human neuroscience

Panagiotis G Simos, Roozbeh Rezaie, Andrew C Papanicolaou, Jack M Fletcher

Affiliations

  1. Department of Psychiatry, School of Medicine, University of Crete Herakleion, Crete, Greece.
  2. Department of Pediatrics, Division of Clinical Neurosciences, College of Medicine, University of Tennessee Health Science Center Memphis, TN, USA ; Neuroscience Institute-Le Bonheur Children's Hospital Memphis, TN, USA.
  3. Department of Psychology, University of Houston Houston, TX, USA.

PMID: 24409136 PMCID: PMC3884211 DOI: 10.3389/fnhum.2013.00932

Abstract

The study examined whether individual differences in performance and verbal IQ affect the profiles of reading-related regional brain activation in 127 students experiencing reading difficulties and typical readers. Using magnetoencephalography in a pseudoword read-aloud task, we compared brain activation profiles of students experiencing word-level reading difficulties who did (n = 29) or did not (n = 36) meet the IQ-reading achievement discrepancy criterion. Typical readers assigned to a lower-IQ (n = 18) or a higher IQ (n = 44) subgroup served as controls. Minimum norm estimates of regional cortical activity revealed that the degree of hypoactivation in the left superior temporal and supramarginal gyri in both RD subgroups was not affected by IQ. Moreover, IQ did not moderate the positive association between degree of activation in the left fusiform gyrus and phonological decoding ability. We did find, however, that the hypoactivation of the left pars opercularis in RD was restricted to lower-IQ participants. In accordance with previous morphometric and fMRI studies, degree of activity in inferior frontal, and inferior parietal regions correlated with IQ across reading ability subgroups. Results are consistent with current views questioning the relevance of IQ-discrepancy criteria in the diagnosis of dyslexia.

Keywords: dyslexia; functional brain imaging; intelligence; magnetoencephalography; reading

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