Table 1 Motivational go/nogo task - results of the ANCOVA analyses (main and interaction effects) for the performance measures and ERP amplitudes [covariate ADHD (FBB-ADHS total score), within-subject factors INCENTIVES and ELECTRODE (only for the Nogo-P3)]. Abbreviations: CNV: contingent negative variation.

Hits (N)

INCENTIVES: F(1,80) = 1.20, n.s.

ADHD × INCENTIVES: F(1,80) = 0.35, n.s.

ADHD: F(1,80) = 0.23, n.s.

Impulsivity errors (N + 1, log)

INCENTIVES: F(1,80) = 11.5, p = 0.001, part. η² = 0.13

ADHD × INCENTIVES: F(1,80) = 0.80, n.s.

ADHD: F(1,80) = 2.34, n.s.

Reaction time (median, ms)

INCENTIVES: F(1,80) = 0.90, n.s.

ADHD × INCENTIVES: F(1,80) = 2.96, n.s.

ADHD: F(1,80) = 0.04, n.s.

Reaction time variability (ms)

INCENTIVES: F(1,80) = 0.11, n.s.

ADHD x INCENTIVES: F(1,80) = 5.69, p = 0.019, part. η ²  = 0.07

ADHD: F(1,80) = 1.22, n.s.

Cue-P3 (Pz, µV)

INCENTIVES: F(1,80) = 0.27, n.s.

ADHD × INCENTIVES: F(1,80) = 0.11, n.s.

ADHD: F(1,80) = 5.61, p = 0.020, part. η ²  =0 .07

CNV (Pz, µV)

INCENTIVES: F(1,80) = 5.31, n.s.

ADHD × INCENTIVES: F(1,80) = 0.01, n.s.

ADHD: F(1,80) = 1.45, n.s.

Go-P3 (Pz, µV)

INCENTIVES: F(1,80) = 1.20, n.s.

ADHD × INCENTIVES: F(1,80) = 0.63, n.s.

ADHD: F(1,80) = 0.61, n.s.

Nogo-P3 (CPz and Pz, µV)

INCENTIVES: F(1,80) = 0.01, n.s.;

ELECTRODE: F(1,80) = 11.7, p = 0.001, part. η² =0.13

INCENTIVES × ELECTRODE: F(1,80) = 1.81, n.s.

ADHD × INCENTIVES: F(1,80) = 0.19, n.s.

ADHD × ELECTRODE: F(1,80) = 1.63, n.s.

ADHD × INCENTIVES x ELECTRODE: F(1,80) = 0.06, n.s.

ADHD: F(1,80) = 5.60, p = 0.020, part. η ²  = 0.07