Fronto-parietal activation in attention-deficit hyperactivity disorder, combined type: functional magnetic resonance...

Area of Science:

• Neuroscience
• Developmental Psychology
• Cognitive Neuroscience

Background:

• Attention-deficit hyperactivity disorder (ADHD), combined type (ADHD-CT), is a prevalent neurodevelopmental disorder.
• Fronto-parietal brain networks are crucial for executive functions, including attention and spatial processing.

Purpose of the Study:

• To investigate neuroactivation patterns in fronto-parietal areas during a mental rotation task in male adolescents with ADHD-CT.
• To compare these patterns with age-, gender-, handedness-, and IQ-matched healthy controls.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was employed using a mental rotation paradigm.
• Participants included male adolescents diagnosed with ADHD-CT and healthy controls.

Main Results:

• The ADHD-CT group exhibited decreased activation in the 'action-attentional' system (Brodmann's areas 46, 39, 40), superior parietal (BA 7), and middle frontal (BA10) areas.
• Conversely, the ADHD-CT group showed increased activation in the posterior midline attentional system.
• These findings indicate significant differences in brain activity between the groups.

Conclusions:

• Adolescents with ADHD-CT display atypical neuroactivation in fronto-parietal regions during cognitive tasks.
• The observed patterns suggest widespread frontal, striatal, and parietal dysfunction in ADHD-CT.
• These results contribute to understanding the neural underpinnings of ADHD.