Functional near-infrared spectroscopy for the assessment of overt reading

Functional near-infrared spectroscopy (fNIRS) has become increasingly established as a promising technique for monitoring functional brain activity. To our knowledge, no study has yet used fNIRS to investigate overt reading of irregular words and nonwords with a full coverage of the cerebral regions...

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Autores principales: Safi, Dima, Lassonde, Maryse, Nguyen, Dang Khoa, Vannasing, Phetsamone, Tremblay, Julie, Florea, Olivia, Morin-Moncet, Olivier, Lefrançois, Mélanie, Béland, Renée
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Blackwell Publishing Inc 2012
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Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3500469/
https://www.ncbi.nlm.nih.gov/pubmed/23170245
http://dx.doi.org/10.1002/brb3.100
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author Safi, Dima
Lassonde, Maryse
Nguyen, Dang Khoa
Vannasing, Phetsamone
Tremblay, Julie
Florea, Olivia
Morin-Moncet, Olivier
Lefrançois, Mélanie
Béland, Renée
author_facet Safi, Dima
Lassonde, Maryse
Nguyen, Dang Khoa
Vannasing, Phetsamone
Tremblay, Julie
Florea, Olivia
Morin-Moncet, Olivier
Lefrançois, Mélanie
Béland, Renée
author_sort Safi, Dima
collection PubMed
description Functional near-infrared spectroscopy (fNIRS) has become increasingly established as a promising technique for monitoring functional brain activity. To our knowledge, no study has yet used fNIRS to investigate overt reading of irregular words and nonwords with a full coverage of the cerebral regions involved in reading processes. The aim of our study was to design and validate a protocol using fNIRS for the assessment of overt reading. Twelve healthy French-speaking adults underwent one session of fNIRS recording while performing an overt reading of 13 blocks of irregular words and nonwords. Reading blocks were separated by baseline periods during which participants were instructed to fixate a cross. Sources (n = 55) and detectors (n = 16) were placed bilaterally over frontal, temporal, parietal, and occipital regions. Two wavelengths were used: 690 nm, more sensitive to deoxyhemoglobin (HbR) concentration changes, and 830 nm, more sensitive to oxyhemoglobin (HbO) concentration changes. For all participants, total hemoglobin (HbT) concentrations (HbO + HbR) were significantly higher than baseline for both irregular word and nonword reading in the inferior frontal gyri, the middle and superior temporal gyri, and the occipital cortices bilaterally. In the temporal gyri, although the difference was not significant, [HbT] values were higher in the left hemisphere. In the bilateral inferior frontal gyri, higher [HbT] values were found in nonword than in irregular word reading. This activation could be related to the grapheme-to-phoneme conversion characterizing the phonological pathway of reading. Our findings confirm that fNIRS is an appropriate technique to assess the neural correlates of overt reading.
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spelling pubmed-35004692012-11-20 Functional near-infrared spectroscopy for the assessment of overt reading Safi, Dima Lassonde, Maryse Nguyen, Dang Khoa Vannasing, Phetsamone Tremblay, Julie Florea, Olivia Morin-Moncet, Olivier Lefrançois, Mélanie Béland, Renée Brain Behav Original Research Functional near-infrared spectroscopy (fNIRS) has become increasingly established as a promising technique for monitoring functional brain activity. To our knowledge, no study has yet used fNIRS to investigate overt reading of irregular words and nonwords with a full coverage of the cerebral regions involved in reading processes. The aim of our study was to design and validate a protocol using fNIRS for the assessment of overt reading. Twelve healthy French-speaking adults underwent one session of fNIRS recording while performing an overt reading of 13 blocks of irregular words and nonwords. Reading blocks were separated by baseline periods during which participants were instructed to fixate a cross. Sources (n = 55) and detectors (n = 16) were placed bilaterally over frontal, temporal, parietal, and occipital regions. Two wavelengths were used: 690 nm, more sensitive to deoxyhemoglobin (HbR) concentration changes, and 830 nm, more sensitive to oxyhemoglobin (HbO) concentration changes. For all participants, total hemoglobin (HbT) concentrations (HbO + HbR) were significantly higher than baseline for both irregular word and nonword reading in the inferior frontal gyri, the middle and superior temporal gyri, and the occipital cortices bilaterally. In the temporal gyri, although the difference was not significant, [HbT] values were higher in the left hemisphere. In the bilateral inferior frontal gyri, higher [HbT] values were found in nonword than in irregular word reading. This activation could be related to the grapheme-to-phoneme conversion characterizing the phonological pathway of reading. Our findings confirm that fNIRS is an appropriate technique to assess the neural correlates of overt reading. Blackwell Publishing Inc 2012-11 2012-10-28 /pmc/articles/PMC3500469/ /pubmed/23170245 http://dx.doi.org/10.1002/brb3.100 Text en © 2012 Published by Wiley Periodicals, Inc. http://creativecommons.org/licenses/by/2.5/ Re-use of this article is permitted in accordance with the Creative Commons Deed, Attribution 2.5, which does not permit commercial exploitation.
spellingShingle Original Research
Safi, Dima
Lassonde, Maryse
Nguyen, Dang Khoa
Vannasing, Phetsamone
Tremblay, Julie
Florea, Olivia
Morin-Moncet, Olivier
Lefrançois, Mélanie
Béland, Renée
Functional near-infrared spectroscopy for the assessment of overt reading
title Functional near-infrared spectroscopy for the assessment of overt reading
title_full Functional near-infrared spectroscopy for the assessment of overt reading
title_fullStr Functional near-infrared spectroscopy for the assessment of overt reading
title_full_unstemmed Functional near-infrared spectroscopy for the assessment of overt reading
title_short Functional near-infrared spectroscopy for the assessment of overt reading
title_sort functional near-infrared spectroscopy for the assessment of overt reading
topic Original Research
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3500469/
https://www.ncbi.nlm.nih.gov/pubmed/23170245
http://dx.doi.org/10.1002/brb3.100
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