Funded by grants from the Fonds québécois de la recherche sur la société et la culture (FQRSC) (Dang Khoa Nguyen and Maryse Lassonde), the Social Sciences and Humanities Research Council of Canada (SSHRC) (Renée Béland), the Canada Research Chair (Maryse Lassonde). Also supported by scholarships from the Fondation de l'Hôpital Sainte-Justine et Fondation des Etoiles and the Fondation Desjardins (Dima Safi).
Functional near-infrared spectroscopy for the assessment of overt reading
Article first published online: 28 OCT 2012
© 2012 The Authors. Brain and Behavior published by Wiley Periodicals, Inc.
This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Brain and Behavior
Volume 2, Issue 6, pages 825–837, November 2012
How to Cite
Brain and Behavior 2012; 2(6): 825–837
- Issue published online: 9 NOV 2012
- Article first published online: 28 OCT 2012
- Manuscript Accepted: 24 SEP 2012
- Manuscript Revised: 16 SEP 2012
- Manuscript Received: 12 JUN 2012
- Fonds québécois de la recherche sur la société et la culture (FQRSC)
- Social Sciences and Humanities Research Council of Canada (SSHRC)
- Canada Research Chair
- Fondation de l'Hôpital Sainte-Justine et Fondation des Étoiles
- Fondation Desjardins
- irregular words;
- lexical reading;
- optical imaging;
- phonological reading;
- reading aloud
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.