nominally significantp = 0.01
A nominally significant impairing effect of active stimulation on delta ACC 2-back performance could be detected in the first 4 blocks (block1: F (1,36) = 6.82, p = 0.01; block2: F (1,36) = 9.11, p = 0.005; block3: F (1,36) = 10.36, p = 0.003; block4: F (1,35) = 5.21, p = 0.03), but not any more in block5 ( F (1,36) = 1.68, p = 0.20) and block6 ( F (1,36) = 1.59, p = 0.21).