Fig. 2

Time-course of average z-scores of all channels for oxyHb in patients with MCS (n = 6) and controls (n = 6) during pre-rest (baseline, 10–30 s), stimulus (30–40 s), and post-rest (recovery, 40–70 s). Y- and X-axes represent z-scored oxyHb values and times. Law and signals reflecting the oxyHb concentration changes in an arbitrary unit were calculated (millimolar–millimeter). Data of the signal were adjusted by an FFT (Fast Fourier Transform) filter smoothing technique (OriginPro 9.1 software of OriginLab Corporation). The cutoff frequency was determined at thirty-five points. MCS group is indicated as a black line and control is indicated as gray line. MO mandarin orange, Pf perfume, NO non-odorant, JC Japanese cypress, Mt menthol. Numbers in parentheses indicate the orders of the 10 repetitions (1–10)