Table 1.

Median SNR and 95% confidence interval for each stimulation condition at two representative electrodes.

	Regular flickering			Irregular flickering
	No task	Visual attention task	Mental counting task	No task	Visual attention task
O2	7.55 (6.77–8.48)	7.04 (6.04–7.96)	5.96 (4.98–6.77)	0.95 (0.9–1.04)	1 (0.9–1.07)
Cz	3.1 (2.88–3.43)	3.68 (3.38–3.95)	3.96 (3.73–4.26)	0.96 (0.85–1.03)	0.88 (0.79–0.93)