ERPs and behavioral inhibition in a Go/No-go task in children with attention-deficit hyperactivity disorder

Area of Science:

• Neuroscience
• Developmental Psychology
• Clinical Psychology

Background:

• Attention-deficit hyperactivity disorder (ADHD) is a neurodevelopmental disorder characterized by difficulties in attention, hyperactivity, and impulsivity.
• Understanding the neural mechanisms underlying inhibitory control is crucial for diagnosing and treating ADHD.

Purpose of the Study:

• To investigate behavioral responses and brain inhibition processes in children with ADHD during a Go/No-go task.
• To explore the impact of task order (stimulus-response compatibility task followed by Go/No-go task) on inhibitory control in ADHD.

Main Methods:

• Event-Related Potentials (ERPs) were recorded from 30 scalp electrodes in 21 boys with ADHD and 21 typically developing boys.
• Participants performed a Go/No-go task, with some performing a stimulus-response compatibility (SRC) task beforehand.

Main Results:

• ADHD children made fewer correct responses compared to controls.
• Both groups showed larger frontal N2 amplitudes for No-go stimuli, indicating response inhibition.
• ADHD children exhibited smaller N2 amplitudes to No-go stimuli after the SRC task.
• Task order influenced N2 prolongation differently in ADHD and control groups.

Conclusions:

• ADHD is associated with difficulties in inhibitory regulation rather than a complete inhibition deficit.
• The findings highlight the complex interplay between task demands, task order, and inhibitory control in ADHD.
• Event-Related Potentials provide valuable insights into the neural underpinnings of ADHD-related behavioral challenges.