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Related Experiment Videos

Functional MRI in attention-deficit hyperactivity disorder: evidence for hypofrontality.

Yu-Feng Zang1, Zhen Jin, Xu-Chu Weng

  • 1Institute of Mental Health, Peking University, Huayuanbeilu 51, Haidian Districk, Beijing 100083, China.

Brain & Development
|May 7, 2005
PubMed
Summary
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Attention deficit hyperactivity disorder (ADHD) children show altered brain activity during cognitive tasks. Methylphenidate (MPH) treatment may improve performance and normalize brain activation patterns in ADHD.

Area of Science:

  • Neuroscience
  • Developmental Psychology
  • Pediatrics

Background:

  • Attention deficit hyperactivity disorder (ADHD) is a neurodevelopmental disorder characterized by inattention and hyperactivity.
  • Cognitive deficits, particularly in executive functions, are common in ADHD.
  • The Stroop effect, a measure of selective attention and cognitive control, is often impaired in individuals with ADHD.

Purpose of the Study:

  • To investigate the behavioral and neural correlates of the Stroop effect in children with ADHD, both with and without methylphenidate (MPH) treatment.
  • To compare brain activation patterns during a Stroop task between children with ADHD and typically developing controls.
  • To explore the potential of MPH to modulate cognitive performance and brain activity in ADHD.

Main Methods:

Related Experiment Videos

  • Event-related functional magnetic resonance imaging (fMRI) was employed to assess brain activation.
  • A Stroop-like paradigm was administered to 9 boys with ADHD and 9 age-matched controls.
  • Data analysis utilized AFNI (Analysis of Functional NeuroImaging) software, including Deconvolution Analysis.

Main Results:

  • Controls exhibited a significant Stroop effect in both behavior and brain activation; ADHD children off MPH did not show this effect.
  • MPH administration appeared to facilitate the emergence of the Stroop effect in ADHD children.
  • Children with ADHD off MPH showed reduced activation volume (AV) in the prefrontal cortex (PFC) and anterior cingulate cortex (ACC) during interference conditions compared to controls.

Conclusions:

  • ADHD is associated with hypofrontality and impaired cognitive control, as evidenced by the lack of a Stroop effect.
  • MPH treatment may help normalize brain function and improve performance on tasks requiring cognitive control in ADHD.
  • A compensatory network involving the basal ganglia, insula, and cerebellum might be engaged in ADHD for less demanding cognitive tasks.