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Mean signal amplitude. (a) Original oxy-Hb, (b) original deoxy-Hb, (c) deep oxy-Hb, (d) deep deoxy-Hb, (e) shallow oxy-Hb, and (f) shallow deoxy-Hb signals. Single (∗), double (∗∗), and triple (∗∗∗) asterisks denote statistical significance at , 0.01, and 0.005, respectively.
