Table 1.

Demographic and descriptive data

Intervention groupAgeGradeNo. of training sessionsTraining performance first two sessionsTraining performance last two sessionsSPM preSPM postSPM FUTONI preTONI postTONI FU
Active control groupMean8.833.6319.4059.1058.8015.3316.2016.5920.8722.5024.81
(SD)(1.44)(1.47)(2.09)(12.80)(17.70)(4.32)(5.10)(3.95)(6.04)(5.06)(7.30)
N-back groupMean9.123.7219.092.172.9315.4416.9416.5220.4122.0324.07
(SD)(1.52)(1.55)(2.28)(0.85)(0.84)(5.15)(4.75)(5.27)(6.51)(7.16)(7.79)
Large training gain (n-back)Mean9.003.7519.192.043.3014.0617.1915.6718.5021.5624.67
(SD)(1.79)(1.65)(2.26)(0.75)(0.75)(4.91)(4.74)(5.07)(4.91)(6.93)(8.15)
Small training gain (n-back)Mean9.253.6919.002.302.5516.8116.6917.4322.3122.5023.43
(SD)(1.24)(1.49)(2.37)(0.95)(0.78)(5.17)(4.91)(5.52)(7.45)(7.57)(7.64)

Note: n = 62 (experimental group: n = 32, 14 girls; large training gain: n = 16, 7 girls; small training gain: n = 16; 7 girls; active control group: n = 30, 15 girls). There were no significant group differences on any of the pretest measures or the demographic variables. Training performance in the experimental group is given as mean n-back level; training performance in the active control group is given as percent correct responses. FU, follow-up test.