The Journal of Physiological Sciences
Online ISSN : 1880-6562
Print ISSN : 1880-6546
ISSN-L : 1880-6546
Regular Papers
Testing for Nonlinearity in Functional Near-Infrared Spectroscopy of Brain Activities by Surrogate Data Methods
Truong Q.D. KhoaHoang M. ThangMasahiro Nakagawa
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2008 Volume 58 Issue 1 Pages 47-52

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Abstract
Methods of contemporary physics are increasingly important for biomedical research. For a multitude of diverse reasons there exists a gap between the practitioners of biomedicine and modern physics methodologies. In this work, the technique of surrogate data has been used as a method to test for the linearity or nonlinearity of biomedical functional near-infrared spectroscopy (fNIRS) signals observing brain activities. Throughout three different surrogate tests, the third-order autocovariance, the asymmetry resulting from time reversal, and the delay vector variance, the dynamic response of brain activities through fNIRS biomedical signals is very likely to be a nonlinear system.
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© 2008 by The Physiological Society of Japan
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