Table 4.

Differences in power between levels of Tetris demand by region for upper alpha band (N = 20).

	Upper alpha band power
Site		t	p	η2
Central	low > excess	5.14	<0.01	0.58
	low > high	4.72	<0.01	0.54
	high > excess	3.95	0.01	0.45
Parietal	low > excess	4.24	<0.01	0.49
	low > high	3.55	0.02	0.40
	high > excess	3.18	<0.01	0.35
Frontal	low > excess	4.18	<0.01	0.48
	high > excess	3.31	<0.01	0.37
	low > high	2.46	0.02	0.24