The maximal powers of theta-, alpha-, and beta-waves of the interesting channels in condition 1 and condition 2 were shown in the
Table 1 and
Figure 2. When subjects had stereo vision, the maximal powers of theta-wave significantly increased in 13 electrodes (FP1, FP2, F7, F3, FZ, F4, F8, FC3, FCZ, FC4, O1, Oz, and O2), compared with those when no stereo vision. Comparing the maximal powers of the alpha-waves between two conditions, there were significant differences in 11 electrodes (FP1, FP2, F7, F3, FZ, F4, F8, FC3, FCZ, FC4 and O2). The maximal powers of beta-wave significantly increased in 8 channels (FP1, FP2 F7, FZ, F4, F8, O1, Oz) in condition 2.
There were significant differences in the changes of the maximal powers among theta-, alpha-, and beta-waves in nine electrodes (FP1, FP2, F3, FZ, F4, FC3, FCZ, FC4, and O2;
Table 2. and
Fig. 3a). The maximal powers of the theta-waves significantly increased in the above channels. Moreover, there were significant differences in the changes of maximal powers of theta-wave (ANOVA analysis, F = 2.973,
P = 0.0004) and alpha band (F = 2.642,
P = 0.0015) among the 13 interesting electrodes (
Fig. 3b). In contrast, the changes of maximal powers of beta-wave were not significantly different among 13 interesting electrodes (F = 1.503,
P = 0.1126). Further, by the Tukey's multiple comparisons tests it showed that the changes of maximal powers of theta-wave were significantly different in F8 vs. O1, F8 vs. OZ, and F4 vs. O1 (
P = 0.0186, 0.0444, and 0.0412, respectively;
Fig. 3c). The changes of the maximal powers of the alpha-waves were significantly different only in FP1 vs. O1 (
P = 0.0182;
Fig. 3d).