Attention deficit hyperactivity disorder (ADHD) is characterized by deficits in cognitive control and a range of difficulties in daily life. The theory of dual mechanism of cognitive control assumes that cognitive control has two distinct forms of con...
Attention deficit hyperactivity disorder (ADHD) is characterized by deficits in cognitive control and a range of difficulties in daily life. The theory of dual mechanism of cognitive control assumes that cognitive control has two distinct forms of control: proactive control and reactive control. Research findings on cognitive control in ADHD suggest deficits in proactive control but have been inconsistent on reactive control. Depression—a frequently reported comorbid condition in adults with ADHD—affects cognitive control. Moreover, ADHD coupled with depression makes life for patients more difficult than ADHD without depression. This study aims to compare cognitive control in adults with ADHD, adults with depression, and normal adults. The study’s participants included 27 adults with ADHD, 16 depressed adults without ADHD symptoms, and 30 normal adults. Cognitive control was examined using AX-CPT with two conditions (the proportion of AX trials and whether nogo trials were present or not). In all AX-CPT conditions, the adult ADHD group showed poorer performance related to both proactive control and reactive control than the normal adult group. Meanwhile, the depression group exhibited poorer performance related to reactive control than the normal group. These results suggest that deficits in cognitive control in adult ADHD and depression are different from each other. While the depression group in this study struggled with situations where contextual conflicts arose regarding their goals, the ADHD group was more likely to experience difficulties in overall performance related to their goals.