Table 2.

Participants’ characteristics for brain waves and attentional control measures. Bold means statistical significance.

	Guided Imagery Group (N = 20)		Mental Task Group (N = 28)		Statistical Test
Measures	M	SD	M	SD	F	p	${\mathit{\eta }}^2$
Brain waves
Alpha power (14th min)	0.25	0.13	0.17	0.12	5.23	0.023	0.105
Beta power (14th min)	0.08	0.03	0.07	0.03	1.23	n.s.	n.s.
Attention control
Numerical Stroop task (% errors)	1.35	1.92	3.24	2.51	8.06	0.007	0.146
Anti-saccade task (% errors)	1.87	3.16	4.42	3.16	7.31	0.010	0.135
Go/No-go task (% errors)	7.33	6.72	8.85	5.93	0.70	n.s.	n.s.