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Altered response control and anterior cingulate function in attention-deficit/hyperactivity disorder boys
Andreas J Fallgatter1, Ann-Christine Ehlis, Juergen Seifert
1Department for Psychiatry and Psychotherapy, University of Wuerzburg, University Hospital, Fuechsleinstrasse 15, 97080 Wuerzburg, Germany. afallgat@mail.uni-wuerzburg.de
Summary
Boys with attention-deficit/hyperactivity disorder (ADHD) show impaired prefrontal response control. This is linked to reduced anterior cingulate cortex (ACC) activation, confirming ACC dysfunction in ADHD.
Area of Science:
- Neuroscience
- Developmental Psychology
- Psychiatry
Background:
- Attention-deficit/hyperactivity disorder (ADHD) is a neurodevelopmental disorder characterized by inattention and hyperactivity.
- Prefrontal cortex (PFC) plays a crucial role in executive functions, including response control and inhibition.
- Dysfunction in PFC-mediated processes is hypothesized to underlie ADHD symptoms.
Purpose of the Study:
- To investigate the neural mechanisms and structural underpinnings of prefrontal response control and inhibition in boys with ADHD.
- To compare electrophysiological responses during a Go-Nogo task between boys with ADHD and healthy controls.
Main Methods:
- Electrophysiological investigation using a visual Go-Nogo task (Continuous Performance Test, CPT).
- Inclusion of 16 boys with ADHD and 19 healthy controls.
- Application of electrophysiological source localization to analyze brain activity.
Main Results:
- Boys with ADHD exhibited a significantly diminished central Nogo-P3 response.
- This was attributed to a lack of Nogo-related frontalization of the brain's electrical field in the ADHD group.
- Reduced anterior cingulate cortex (ACC) activation was observed in ADHD boys during the Nogo condition.
Conclusions:
- Unmedicated boys with ADHD demonstrate deficits in prefrontal response control.
- These deficits do not appear to be exclusively inhibitory in nature.
- The findings support the hypothesis of anterior cingulate cortex (ACC) dysfunction in ADHD.