Advances in Neural Signal Processing
22
3.1.3.2 Beta: comeback period
We performed a 2 × 3 ANOVA using condition (vertical, diagonal) and time
window (p1, p2, p3) as factors. We performed the analysis on frontal and parietal
ROIs.
For the frontal ROI, none of the main effects were significant (all p > 0.12).
The condition-time window interaction was significant [F(2, 20) = 4.07; p < 0.05;
η2 = 0.28]. Fisher LSD post hoc revealed that p1 in vertical was significantly different from all other factors (p < 0.05) (see Figure 10A).
For the parietal ROI, none of the main effects were significant (all p > 0.55).
The condition-time window interaction was significant [F(2, 20) = 5.45; p < 0.05;
η2 = 0.35]. Fisher LSD post hoc revealed that p1 in vertical was significantly different from p2 in vertical (p < 0.01), p3 in vertical (p < 0.01), p1 in diagonal
(p < 0.05), and p3 in diagonal (p < 0.05), while all other comparisons were not
significant (see Figure 10B). For the parietal ROI, none of the main effects were
significant (all p > 0.55).
Figure 10.
Beta (13–30 Hz) analysis of time windows p1, p2, and p3 during comeback period for frontal ROI (A) and
parietal ROI (B). Bold lines represent significant differences (p < 0.05).
Figure 9.
Beta (13–30 Hz) time-frequency plot with peak segmentation during forward period (left panels) and
comeback period (right panels) for frontal ROI (A, B) and parietal ROI (C, D).