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Related Experiment Videos

Attention deficit disorders: are we barking up the wrong tree?

Pedro Cabral1

  • 1Pediatric Neurology Unit, CHLO, Estr. do Forte Alto do Duque, 1400 Lisboa, Portugal. vassalocabral@clix.pt

European Journal of Paediatric Neurology : EJPN : Official Journal of the European Paediatric Neurology Society
|April 18, 2006
PubMed
Summary

Attention deficit disorder (ADD) and attention deficit/hyperactivity disorder (ADHD) may stem from neuro-modulation imbalances affecting arousal and attention. A core defect in prefrontal cortex inhibitory control, rather than hyperactivity, may underlie inattention.

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Area of Science:

  • Neuroscience
  • Developmental Psychology
  • Psychiatry

Background:

  • Attention deficit disorder (ADD) and attention deficit/hyperactivity disorder (ADHD) are common developmental disorders with unclear biological markers.
  • Current understanding lacks a comprehensive framework for the spectrum of ADD/ADHD manifestations.
  • The roles of arousal, attention, and neuro-modulation in ADD/ADHD require further elucidation.

Purpose of the Study:

  • To propose a framework for understanding the expanded spectrum of ADD/ADHD.
  • To integrate knowledge of arousal and attention mechanisms during the sleep/wake cycle.
  • To highlight the role of neuro-modulation in synaptic development and ADD/ADHD symptoms.

Main Methods:

  • Review of current knowledge on arousal and attention mechanisms.

Related Experiment Videos

  • Analysis of neuro-modulation's role in synaptic architecture and development.
  • Examination of prefrontal cortex (PFC) function during sleep and wakefulness.

    • Main Results:

    • Sleep involves cyclic deactivation of the dorsolateral prefrontal cortex (DLPFC) and decreased noradrenergic (NA) tone.
    • A prolonged imbalance in neuro-modulation, specifically a relative deficiency in catecholamines, may impair waking DLPFC activation.
    • This imbalance could explain key ADD manifestations, suggesting a core defect in inhibitory control.

    Conclusions:

    • ADD/ADHD may be understood as a spectrum disorder stemming from impaired prefrontal cortex-dependent inhibitory control.
    • Noradrenaline (NA) plays a crucial role, potentially more significant than dopamine, in ADD/ADHD.
    • Inattention, rather than hyperactivity, may be the primary symptom resulting from this core defect.