borderline significantp = 0.050
In the 1-back test, ch1 and ch2 had a borderline significant correlation with rMSSD (ch1: r = −0.304, p = 0.050; ch2: r = −0.292, p = 0.061), and the oxy-Hb concentrations of ch5 and ch6 were significantly negatively correlated with rMSSD (ch5: r = −0.350, p = 0.023; ch6: r = −0.324, p = 0.036).