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Related Experiment Videos

Oculomotor abnormalities in attention deficit hyperactivity disorder: a preliminary study.

S H Mostofsky1, A G Lasker, L E Cutting

  • 1Kennedy Krieger Institute, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA. mostofsky@kenedykrieger.org

Neurology
|August 15, 2001
PubMed
Summary

Children with attention deficit hyperactivity disorder (ADHD) exhibit deficits in response inhibition and working memory, as evidenced by oculomotor tasks. Methylphenidate may improve motor response consistency in ADHD.

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Area of Science:

  • Neuroscience
  • Developmental Psychology
  • Cognitive Science

Background:

  • Attention deficit hyperactivity disorder (ADHD) is hypothesized to stem from prefrontal cortex-mediated motor intentional system dysfunction.
  • Oculomotor paradigms offer a method to investigate cognitive-motor integration and localize dysfunction in ADHD.

Purpose of the Study:

  • To examine prefrontal cortex functions, including motor response preparation, inhibition, and working memory, in children with ADHD using saccade tasks.
  • To compare oculomotor performance in children with ADHD (medicated and unmedicated) against neurotypical controls.

Main Methods:

  • Utilized three saccade tasks: prosaccades, antisaccades, and memory-guided saccades.
  • Included 19 children with ADHD (8 medicated, 11 unmedicated) and 25 age/gender-matched controls.

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  • Analyzed saccade accuracy and latency, as well as error rates.

    • Main Results:

    • Children with ADHD showed increased directional errors on antisaccade and anticipatory errors on memory-guided saccade tasks, indicating response inhibition deficits.
    • Unmedicated children with ADHD exhibited greater prosaccade latency variability and longer latency on memory-guided saccades compared to controls.
    • No significant differences in prosaccade latency or memory-guided saccade accuracy were found between ADHD groups and controls.

    Conclusions:

    • Oculomotor deficits, particularly in response inhibition, are implicated in ADHD-related behavioral abnormalities.
    • Methylphenidate administration appears to enhance motor response consistency in children with ADHD.
    • Further research with on/off medication designs is needed to confirm methylphenidate's effects on response inhibition.