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

Figure 5

Normalized alpha power, averaged across participants (mean ± sem), over the two scalp regions (front-central-temporal FCT (a); parietal-occipital PO (b)) at each of the three phases (r1, T, and r2) of the arithmetic session and of the reading numbers session. Asterisks denote the results of multiple one-sample t-tests comparing the normalized alpha power in the phases T and r2 of each session with the reference value (1), separately within each region (significance cut-off = 0.05/4 = 0.0125). In both regions, significant deviation from the reference value was found during the task phases T ( for both arithmetic and reading numbers) but not during the r2 phases (FCT: arithmetic; reading numbers; PO: arithmetic; reading numbers) (a) Normalized alpha power-FCT. (b) Normalized alpha power-PO.

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