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

Figure 4

Normalized alpha power, averaged across participants (mean ± sem), at each single electrode in Experiment 1, distinguishing between session (arithmetic session: red lines; reading numbers session: blue lines) and phase (phase T: continuous lines; phase r2: dotted lines). Value 1 represents the pretask reference value (at phase r1) for each electrode; thus, values below 1 indicate alpha power decrease (desynchronization) while values above 1 indicate alpha power increase (synchronization) compared to the pretask phase, at single-channel level.