EEG Alpha Power Is Modulated by Attentional Changes during Cognitive Tasks and Virtual Reality Immersion

Figure 9

Temporal pattern, at 1-minute resolution, of the normalized alpha power (mean ± sem across participants) throughout the first ten minutes of the VR sessions, plotted separately for each scalp region (front-central-temporal FCT (a); parietal-occipital PO (b)). The examined ten minutes included the r1 phase from minute 1 to minute 5 and the r1VR phase from minute 6 to minute 10. For each region, the α power at each minute was normalized with respect to the value obtained at minute 1 (i.e., the first minute of phase r1). Symbols above each point denote the results of multiple one-sample t-tests comparing the normalized α power at each minute (from 2 to 10) with the reference value (1), separately within each region (significance cut-off = 0.05/9 = 0.0056). Symbols ∗ denote points that satisfied the uncorrected significance threshold (0.05), while symbols § denote points that survived the severe Bonferroni correction (0.05/9). Uncorrected values at each point (subscript indicate the minute at which the value refer to) are , , , , , , ; , for the FCT region; , , , , , , ; , for the PO region. (a) Normalized alpha power-FCT. (b) Normalized alpha power-PO.

(a)

(b)