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Measuring Neural Mechanisms Underlying Sleep-Dependent Memory Consolidation During Naps in Early Childhood
08:20

Measuring Neural Mechanisms Underlying Sleep-Dependent Memory Consolidation During Naps in Early Childhood

Published on: October 2, 2019

Sleep restores daytime deficits in procedural memory in children with attention-deficit/hyperactivity disorder

Alexander Prehn-Kristensen1, Ina Molzow, Manuel Munz

  • 1Center for Integrative Psychiatry, Department of Child and Adolescent Psychiatry and Psychotherapy, Christian-Albrechts-University School of Medicine, 24105 Kiel, Germany. a.prehn@zip-kiel.de

Research in Developmental Disabilities
|August 9, 2011
PubMed

Insights

Children with attention-deficit/hyperactivity disorder (ADHD) show improved procedural memory after sleep, unlike healthy children. This suggests sleep may normalize motor skill deficits in ADHD by reducing cognitive interference.

Area of Science:

  • Neuroscience
  • Sleep Science
  • Developmental Psychology

Background:

  • Sleep is crucial for memory consolidation, including declarative and procedural memory.
  • Prefrontal cortex (PFC) activity differentially affects declarative and procedural memory consolidation during sleep.
  • Attention-deficit/hyperactivity disorder (ADHD) is associated with hypoactivity in the PFC.

Purpose of the Study:

  • To investigate whether children with ADHD benefit more from sleep regarding procedural memory consolidation compared to healthy children.
  • To explore the relationship between sleep stages and procedural memory gains in children with ADHD.

Main Methods:

  • A modified serial-reaction-time task was used to assess procedural memory.
  • Participants included 16 children with ADHD and 16 healthy controls (aged 9-12).
  • A within-subject design compared a sleep condition (learning evening, retrieval morning) with a wake condition (learning morning, retrieval evening).

Main Results:

  • Children with ADHD demonstrated significant improvement in motor skills after sleep compared to the wake condition.
  • Sleep-associated gains in reaction times in the ADHD group positively correlated with sleep stage 4 duration and REM density.
  • Healthy children did not show significant motor performance benefits from sleep in this task.

Conclusions:

  • Sleep appears to normalize procedural memory deficits in children with ADHD.
  • Attenuated prefrontal control in ADHD may facilitate sleep-dependent motor skill gains by minimizing interference between explicit and implicit learning components.

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