Table 1.

Performance and amount of training for the three training tasks (mean ± SD)

	Highest level achievedin the first threesessions	Highest level achievedin the last threesessions	Number of completed training sessionsa
Visuospatial WM task	8.00 ± 0.89	8.90 ± 0.94	40.5 ± 12.4
Operation N-back	3.20 ± 0.75	4.30 ± 1.10	39.1 ± 12.7
Dual N-back	2.50 ± 0.50	3.80 ± 0.60	37.6 ± 12.8

^aNote unless there was some reason for subjects to forgo completion of a task, the number of training sessions for the three tasks would have been the same because subjects were required to do all the tasks. In addition, since subjects were required to do the three training tasks in the same order, the number of training sessions in the first training task (the visuospatial WM task) was the highest.