Top-down control of MEG alpha-band activity in children performing Categorical N-Back Task

Kristina T. Ciesielski, Seppo P. Ahlfors, Edward J. Bedrick, Audra A. Kerwin, Matti S. Hämäläinen

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


Top-down cognitive control has been associated in adults with the prefrontal-parietal network. In children the brain mechanisms of top-down control have rarely been studied. We examined developmental differences in top-down cognitive control by monitoring event-related desynchronization (ERD) and event-related synchronization (ERS) of alpha-band oscillatory activity (8-13. Hz) during anticipation, target detection and post-response stages of a visual working memory task. Magnetoencephalography (MEG) was used to record brain oscillatory activity from healthy 10-year-old children and young adults performing the Categorical N-Back Task (CNBT). Neuropsychological measures assessing frontal lobe networks were also acquired. Whereas adults showed a modulation of the ERD at the anticipatory stages of CNBT and ERS at the post-response stage, children displayed only some anticipatory modulation of ERD but no ERS at the post-response stage, with alpha-band remaining at a desynchronized state. Since neuropsychological and prior neuroimaging findings indicate that the prefrontal-parietal networks are not fully developed in 10-year olds, and since the children performed as well as the adults on CNBT and yet displayed different patterns of ERD/ERS, we suggest that children may be using different top-down cognitive strategies and, hence, different, developmentally apt neuronal networks.

Original languageEnglish (US)
Pages (from-to)3573-3579
Number of pages7
Issue number12
StatePublished - Oct 2010
Externally publishedYes


  • Cognitive development
  • Dorsal visual cortical network
  • Magnetoencephalography
  • Top-down control of alpha-band activity
  • Visual Categorical N-Back Task

ASJC Scopus subject areas

  • Experimental and Cognitive Psychology
  • Cognitive Neuroscience
  • Behavioral Neuroscience


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