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Related Concept Videos

Attention-Deficit/Hyperactivity Disorder01:30

Attention-Deficit/Hyperactivity Disorder

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Event Related Potentials (ERPs) and other EEG Based Methods for Extracting Biomarkers of Brain Dysfunction: Examples from Pediatric Attention Deficit/Hyperactivity Disorder (ADHD)
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Jitter Reduces Response-Time Variability in ADHD: An Ex-Gaussian Analysis.

Ryan W Y Lee1, Lisa A Jacobson2, Alison E Pritchard2

  • 1Kennedy Krieger Institute, Baltimore, MD, USA.

Journal of Attention Disorders
|November 30, 2012
PubMed
Summary

Stimulus interval jittering reduced response time variability in children with ADHD. This non-pharmacological approach may improve sustained attention and reduce performance lapses.

Keywords:
ADHDattentionex-Gaussianexecutive functionjitterresponse timestatisticsvariability

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Developmental Psychology

Background:

  • Individuals with Attention-Deficit/Hyperactivity Disorder (ADHD) exhibit increased intrasubject variability (ISV) in response times (RTs) during tasks with fixed interstimulus intervals (ISIs).
  • Ex-Gaussian models are utilized to analyze RT distributions, as standard Gaussian curves can obscure the impact of extreme response latencies on variability.

Purpose of the Study:

  • To investigate the impact of stimulus interval jittering on RT variability in children diagnosed with ADHD compared to typically developing controls.
  • To determine if jittering affects specific components of the RT distribution, particularly the exponential (tau) and normal (sigma) parameters.

Main Methods:

  • Employed ex-Gaussian analysis to assess RT variability in a go/no-go task.
  • Recruited 75 children (ages 9-14), including 44 with ADHD and 31 controls.
  • Administered the go/no-go task under both fixed and jittered interstimulus interval (ISI) conditions.

Main Results:

  • Children with ADHD demonstrated significantly greater RT variability, primarily due to elevated tau (exponential component), not sigma (normal component).
  • Introduction of jittered ISIs led to a reduction in tau for the ADHD group, bringing their variability to levels comparable to controls.
  • Jittering effectively reduced performance lapses, a hallmark of impaired response control in ADHD.

Conclusions:

  • Stimulus interval jittering may serve as a non-pharmacological intervention to enhance response readiness in children with ADHD.
  • Jittering shows potential for improving sustained, controlled performance by mitigating response variability and lapses.