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Attention-deficit hyperactivity disorder involves differential cortical processing in a visual spatial attention

V López1, J López-Calderón, R Ortega

  • 1Departamento de Psiquiatría y Centro de Investigaciones Médicas, Escuela de Medicina, Pontificia Universidad Católica de Chile, Chile.

Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology
|September 27, 2006
PubMed
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Children with Attention-deficit hyperactivity disorder (ADHD) may not have issues with early visual attention filtering. Instead, their attentional resources are distributed differently in later brain processing stages.

Area of Science:

  • Neuroscience
  • Developmental Psychology
  • Cognitive Science

Background:

  • Attention-deficit hyperactivity disorder (ADHD) is characterized by inattention.
  • Evidence suggests not all attentional processes are impaired in ADHD.
  • Understanding attentional resource distribution is key to ADHD research.

Purpose of the Study:

  • To investigate attentional resource distribution in children with ADHD.
  • To utilize a spatially shifted double-oddball visual task.
  • To compare ADHD and control groups' attentional processing.

Main Methods:

  • Event-related potentials (ERPs) were recorded for visual stimuli.
  • Participants were instructed to focus attention in a specific visual area.
  • Ten male children with ADHD (combined subtype) and ten controls participated.

Related Experiment Videos

Main Results:

  • ADHD subjects exhibited late differential cortical responses to ignored peripheral stimuli.
  • Early N1-P1 components were similar between groups, modulated by stimulus location.
  • A late P300-like positivity was observed in ADHD subjects for peripheral stimuli.

Conclusions:

  • ADHD may not impair the early spatial attentional filter.
  • Attentional resource allocation differs in later cortical processing stages in ADHD.
  • These findings may relate to individual differences in attentional mechanisms.