Table 6. Mean cognitive scores (SDs) for the two conditions at pretest and posttest.

Scores are scaled and centered for each task (z-transformed by row).

	HIT		Control
	Pretest	Posttest	Pretest	Posttest
Flanker	−0.14 (1.20)	0.16 (0.66)	−0.06 (1.18)	0.04 (0.85)
Go/no-go	−0.09 (1.11)	0.08 (0.96)	0.01 (1.04)	0.01 (0.88)
Stroop	−0.11 (1.19)	0.16 (0.38)	−0.09 (1.31)	0.04 (0.83)
Backward digit span	−0.14 (1.07)	0.25 (0.55)	−0.13 (1.34)	0.02 (0.82)
Backward Corsi blocks	−0.13 (1.55)	0.31 (0.35)	−0.17 (0.92)	0.00 (0.73)
Visual 2-back	−0.24 (1.62)	0.33 (0.51)	−0.06 (0.74)	−0.03 (0.69)