Table 1. Grand average of root mean global field power (computed at peak of corrected latency averages) converted into SNR, by frequency band (V = visual task; A = auditory task).

SNR	baseline		task
	V	A	V	A
Beta 2	5.60	5.67	7.21**	6.83**
Beta 1	6.54	6.66	7.72**	7.50**
Alpha 2	5.18	5.15	6.19**	5.80**
Alpha 1	4.93	5.57	5.94**	6.04
Theta	5.76	5.50	5.36	5.65
Delta	3.32	3.15	8.89**	6.43**

Significant increases in power with respect to baseline are indicated by asterisks (p<0.01, paired t-tests).