Table 1.

Balancing the occurrences of conditions (making the probability for following conditions equal in relation to the frequency of each condition).

	Condition i + 1
Condition i	Active listening	1-back	3-back	Silent/rest
Active listening		6*	6	9
1-back	6		6	9
3-back	6	6		8
Silence/rest	9	8	9

*Condition 1 is followed by condition 2 six times.