Table 3. Estimate of coherence standard error for the theta and alpha bands obtained through bootstrapping procedure for the difficulty levels.

	Mean value of standard error				Percentage of mean value %
Theta band
Difficulty level	3 balls	4 balls	5 balls	6 balls	3 balls	4 balls	5 balls	6 balls
Juggler J1	0.03	0.02	0.02	0.03	3.49	2.93	2.48	2.57
Juggler J2	0.05	0.04	0.03	0.02	4.66	4.26	2.56	2.49
Hyperbrain	0.03	0.01	0.01	0.01	2.99	1.31	1.05	1.08
Alpha band
Difficulty level	3 balls	4 balls	5 balls	6 balls	3 balls	4 balls	5 balls	6 balls
Juggler J1	0.05	0.04	0.03	0.03	5.03	4.40	2.87	2.73
Juggler J2	0.05	0.05	0.03	0.04	4.72	4.62	3.27	3.09
Hyperbrain	0.03	0.03	0.02	0.02	3.02	3.00	2.48	1.99