Dorsolateral prefrontal cortex hyperactivity during inhibitory control in children with ADHD in the antisaccade task

Area of Science:

• Neuroscience
• Developmental Psychology

Background:

• Children with Attention-Deficit/Hyperactivity Disorder (ADHD) often display deficits in response inhibition.
• The prefrontal hypoactivation hypothesis is a leading explanation, but evidence is conflicting.

Purpose of the Study:

• To investigate the hypoactivation hypothesis in children with ADHD using an oculomotor response inhibition task.
• To analyze brain activity during the preparatory phase of an antisaccade task to assess inhibitory control.

Main Methods:

• fMRI and concurrent eye-tracking were used with 22 children with ADHD and 20 controls performing an antisaccade task.
• The task included a preparatory stage to test inhibitory control without response confounding.

Main Results:

• Children with ADHD exhibited longer reaction times and more errors on the antisaccade task.
• The ADHD group showed significant hyperactivation in the dorsolateral prefrontal cortex during the preparatory stage, contrary to the hypoactivation hypothesis.
• No significant drug-related activation differences were found when analyzing ADHD participants on and off stimulant medication.

Conclusions:

• The findings do not support a general hypoactivity explanation for inhibitory control deficits in ADHD.
• Results suggest reduced efficiency in inhibitory processing during the antisaccade task in children with ADHD.
• Observed hyperactivation contrasts with findings in ADHD adults, indicating potential age-dependent maturation effects on inhibitory control within the oculomotor system.