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Journal of Biomedical Optics

Impact of communicative head movements on the quality of functional near-infrared spectroscopy signals: negligible effects for affirmative and negative gestures and consistent artifacts related to raising eyebrows
Author(s): Joana Bisol Balardin; Guilherme Agusto Zimeo Morais; Rogério Akira Furucho; Lucas Romualdo Trambaiolli; João Ricardo Sato
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Paper Abstract

Functional near-infrared spectroscopy (fNIRS) is currently one of the most promising tools in the neuroscientific research to study brain hemodynamics during naturalistic social communication. The application of fNIRS by studies in this field of knowledge has been widely justified by its strong resilience to motion artifacts, including those that might be generated by communicative head and facial movements. Previous studies have focused on the identification and correction of these artifacts, but a quantification of the differential contribution of common communicative movements on the quality of fNIRS signals is still missing. We assessed the impact of four movements (nodding head up and down, reading aloud, nodding head sideways, and raising eyebrows) performed during rest and task conditions on two metrics of signal quality control: an estimative of signal-to-noise performance and the negative correlation between oxygenated and deoxygenated hemoglobin (oxy-Hb and deoxy-Hb). Channel-wise group analysis confirmed the robustness of the fNIRS technique to head nodding movements but showed a large effect of raising eyebrows in both signal quality control metrics, both during task and rest conditions. Reading aloud did not disrupt the expected anticorrelation between oxy-Hb and deoxy-Hb but had a relatively large effect on signal-to-noise performance. These findings may have implications to the interpretation of fNIRS studies examining communicative processes.

Paper Details

Date Published: 28 April 2017
PDF: 9 pages
J. Biomed. Opt. 22(4) 046010 doi: 10.1117/1.JBO.22.4.046010
Published in: Journal of Biomedical Optics Volume 22, Issue 4
Show Author Affiliations
Joana Bisol Balardin, Univ. Federal do ABC (Brazil)
SBIBHAE (Brazil)
Guilherme Agusto Zimeo Morais, NIRx Medical Technologies, LLC (Germany)
Rogério Akira Furucho, Univ. Federal do ABC (Brazil)
Lucas Romualdo Trambaiolli, Univ. Federal do ABC (Brazil)
João Ricardo Sato, Univ. Federal do ABC (Brazil)

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