An asymmetric stroop/reverse-stroop interference phenomenon in ADHD.

Objective: To examine whether participants with ADHD showed a deficit in Stroop/reverse-Stroop interference by comparing them to non-ADHD participants.

Methods: A group with ADHD, primarily inattentive type (n = 15), and a paired non-ADHD group (n = 15) completed the group version of the Stroop/reverse-Stroop test.

Results: Asymmetric interference was observed between the Stroop test and the reverse-Stroop test in ADHD participants, presenting evidence contrary to Barkley's behavioral inhibition model of ADHD in which response inhibition deficits pertained only to the ADHD-C subtype.

Conclusions: Participants with ADHD showed a control deficit in reverse-Stroop interference but not in Stroop interference.