Attentional processing in adults with ADHD as reflected by event-related potentials
Vanessa Prox1, Detlef E Dietrich, Yuanyuan Zhang
1Department of Clinical Psychiatry and Psychotherapy, Medical University of Hannover (MHH), Carl-Neuberg-Strasse 1, D-30625 Hannover, Germany.
Neuroscience Letters
|May 1, 2007
Summary
Adults with Attention Deficit/Hyperactivity Disorder (ADHD) show enhanced early attention brain responses (N1 and N2) compared to controls. This suggests adults with ADHD may overcompensate to maintain attention.
Area of Science:
- Neuroscience
- Psychiatry
Background:
- Attention Deficit/Hyperactivity Disorder (ADHD) is primarily studied in children, with limited research on adult event-related potentials (ERPs).
- ERPs offer insights into the neural mechanisms of cognitive processes, including attention.
Purpose of the Study:
- To investigate event-related potentials (ERPs) in adults diagnosed with ADHD during a visual Go/NoGo task.
- To explore neural differences in target evaluation processing between ADHD adults and healthy controls.
Main Methods:
- A visual Go/NoGo experiment was conducted.
- 12 adults with ADHD and 12 healthy adults were examined using ERPs.
- Source analysis was employed to pinpoint brain regions associated with ERP components.
Main Results:
- ADHD adults exhibited significantly increased N1 and N2 attention-related ERP components compared to healthy controls.
- Source analysis revealed increased activity in the medial frontal gyrus (N1) and lingual gyrus (N2) in ADHD adults.
- A trend towards decreased P300 activity was observed in ADHD adults, with significant differences noted in subsequent slow wave activity.
Conclusions:
- Adults with ADHD demonstrate enhanced early attentional processing (N1, N2) and potentially altered later attentional mechanisms (P300).
- Findings suggest ADHD adults may employ stronger attentional effort to compensate for impairments, supported by increased neural activity in specific brain areas.
