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Integration of Spatial Information Increases Reproducibility in Functional Near-Infrared Spectroscopy

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Novi, Sergio Luiz [1, 2] ; Forero, Edwin Johan [1, 2] ; Ivan Rubianes Silva, Jose Angel [3, 1] ; de Souza, Nicolas Gabriel S. R. [1, 2] ; Martins, Giovani Grisotti [1, 2] ; Quiroga, Andres [1, 2] ; Wu, Shin-Ting [3, 1] ; Mesquita, Rickson C. [1, 2]
Número total de Autores: 8
Afiliação do(s) autor(es):
[1] Brazilian Inst Neurosci & Neurotechnol, Campinas - Brazil
[2] Univ Estadual Campinas, Grab Wataghin Inst Phys, Campinas - Brazil
[3] Univ Estadual Campinas, Sch Elect & Comp Engn, Campinas - Brazil
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Citações Web of Science: 0

As functional near-infrared spectroscopy (fNIRS) is developed as a neuroimaging technique and becomes an option to study a variety of populations and tasks, the reproducibility of the fNIRS signal is still subject of debate. By performing test-retest protocols over different functional tasks, several studies agree that the fNIRS signal is reproducible over group analysis, but the inter-subject and within-subject reproducibility is poor. The high variability at the first statistical level is often attributed to global systemic physiology. In the present work, we revisited the reproducibility of the fNIRS signal during a finger-tapping task across multiple sessions on the same and different days. We expanded on previous studies by hypothesizing that the lack of spatial information of the optodes contributes to the low reproducibility in fNIRS, and we incorporated a real-time neuronavigation protocol to provide accurate cortical localization of the optodes. Our proposed approach was validated in 10 healthy volunteers, and our results suggest that the addition of neuronavigation can increase the within-subject reproducibility of the fNIRS data, particularly in the region of interest. Unlike traditional approaches to positioning the optodes, in which low intra-subject reproducibility has been found, we were able to obtain consistent and robust activation of the contralateral primary motor cortex at the intra-subject level using a neuronavigation protocol. Overall, our findings support the hypothesis that at least part of the variability in fNIRS cannot be only attributed to global systemic physiology. The use of neuronavigation to guide probe positioning, as proposed in this work, has impacts to longitudinal protocols performed with fNIRS. (AU)

Processo FAPESP: 13/07559-3 - Instituto Brasileiro de Neurociência e Neurotecnologia - BRAINN
Beneficiário:Fernando Cendes
Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs
Processo FAPESP: 12/02500-8 - Desenvolvimento de instrumentação e metodologias para monitoramento de oxigenação, fluxo sanguíneo e metabolismo cerebral com espectroscopias ópticas de difusão
Beneficiário:Rickson Coelho Mesquita
Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores
Processo FAPESP: 19/21962-1 - Investigação da neuroplasticidade no cérebro humano com espectroscopia no infravermelho próximo
Beneficiário:Sergio Luiz Novi Junior
Modalidade de apoio: Bolsas no Brasil - Doutorado Direto