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Phasic changes in HbO in parieto-occipital, right motor, left motor, and frontal regions (left vertical axis: EEG power in dB; right vertical axis: corresponding RT; horizontal axis: time in seconds; solid black line: stimulus onset). The red or blue color represent the significant difference (p-value < 0.05) between the baseline and deviation periods, and the green color represents no significant difference between these periods.
