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...
Autores principales: | , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Blackwell Publishing Inc
2012
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Materias: | |
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. |
format | Online Article Text |
id | pubmed-3500469 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2012 |
publisher | Blackwell Publishing Inc |
record_format | MEDLINE/PubMed |
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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