Table 2.

Difficulty levels used in the n-back (WM) training task.

Level	n-back	ISI (ms)	Level	n-back	ISI (ms)	Level	n-back	ISI (ms)
1	2-back	1,800	6	3-back	1,400	11	5-back	1,600
2	2-back	1,600	7	4-back	1,800	12	5-back	1,400
3	2-back	1,400	8	4-back	1,600	13	6-back	1,800
4	3-back	1,800	9	4-back	1,400	14	6-back	1,600
5	3-back	1,600	10	5-back	1,800	15	6-back	1,400

ISI: interstimulus interval; WM: working memory.