Sensor space group analysis for fNIRS data

Tak, S, Uga, M, Flandin, G, Dan, I and Penny, W D (2016) Sensor space group analysis for fNIRS data. Journal of Neuroscience Methods, 264. pp. 103-112. ISSN 0165-0270

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Abstract

BACKGROUND: Functional near-infrared spectroscopy (fNIRS) is a method for monitoring hemoglobin responses using optical probes placed on the scalp. fNIRS spatial resolution is limited by the distance between channels defined as a pair of source and detector, and channel positions are often inconsistent across subjects. These challenges can lead to less accurate estimate of group level effects from channel-specific measurements. NEW METHOD: This paper addresses this shortcoming by applying random-effects analysis using summary statistics to interpolated fNIRS topographic images. Specifically, we generate individual contrast images containing the experimental effects of interest in a canonical scalp surface. Random-effects analysis then allows for making inference about the regionally specific effects induced by (potentially) multiple experimental factors in a population. RESULTS: We illustrate the approach using experimental data acquired during a colour-word matching Stroop task, and show that left frontopolar regions are significantly activated in a population during Stroop effects. This result agrees with previous neuroimaging findings. COMPARED WITH EXISTING METHODS: The proposed methods (i) address potential misalignment of sensor locations between subjects using spatial interpolation; (ii) produce experimental effects of interest either on a 2D regular grid or on a 3D triangular mesh, both representations of a canonical scalp surface; and (iii) enables one to infer population effects from fNIRS data using a computationally efficient summary statistic approach (random-effects analysis). Significance of regional effects is assessed using random field theory. CONCLUSIONS: In this paper, we have shown how fNIRS data from multiple subjects can be analysed in sensor space using random-effects analysis.

Item Type: Article
Additional Information: Copyright © 2016 The Authors. Published by Elsevier B.V. All rights reserved.
Uncontrolled Keywords: brain mapping,executive function,humans,computer-assisted image processing,prefrontal cortex,near-infrared spectroscopy,stroop test
Faculty \ School: Faculty of Social Sciences > School of Psychology
Depositing User: Pure Connector
Date Deposited: 19 Aug 2017 05:06
Last Modified: 22 Apr 2020 05:21
URI: https://ueaeprints.uea.ac.uk/id/eprint/64576
DOI: 10.1016/j.jneumeth.2016.03.003

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