Stopping and changing in adults with ADHD

E. M. Bekker*, C. C. Overtoom, J. L. Kenemans, J. J. Kooij, I. De Noord, J. K. Buitelaar, M. N. Verbaten

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Background. A lack of inhibitory control has been suggested to be the core deficit in children with attention deficit hyperactivity disorder (ADHD). This means that a primary deficit in behavioral inhibition mediates a cascade of secondary deficits in other executive functions, such as arousal regulation. Clinical observations have revealed that with increasing age symptoms of hyperactivity and impulsivity decline at a higher rate than those of inattention. This might imply that a deficit in attention rather than a lack of inhibitory control is the major feature in adult ADHD. Method. To study whether an attentional or inhibitory deficit predominates, the stop-signal task and the stop-change task were presented to 24 adults with ADHD combined subtype and 24 controls. Results. Relative to controls, the stop-signal reaction time (SSRT) was significantly more prolonged than the go-stimulus reaction time (RT) in patients with ADHD. This disproportionate elongation of the SSRT was comparable across tasks, even though the stop-change task exerted more complex (or at least different) demands on the inhibitory system than the stop-signal task. ADHD patients had a higher proportion of choice errors, possibly reflecting more premature responses. Specifically in the stop-change task, patients had more variable choice responses and made more inappropriate change responses, which may also reflect enhanced impulsivity. Conclusions. The results support a core deficit in behavioral inhibition in adults with ADHD. We further suggest that there is more evidence for a critical role of deficient inhibitory control in adults than in children with ADHD.

Original languageEnglish
Pages (from-to)807-816
Number of pages10
JournalPsychological Medicine
Volume35
Issue number6
DOIs
Publication statusPublished - 1 Jun 2005
Externally publishedYes

Cite this

Bekker, E. M., Overtoom, C. C., Kenemans, J. L., Kooij, J. J., De Noord, I., Buitelaar, J. K., & Verbaten, M. N. (2005). Stopping and changing in adults with ADHD. Psychological Medicine, 35(6), 807-816. https://doi.org/10.1017/S0033291704003459