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Alpha desynchronization and fronto-parietal connectivity during spatial working memory encoding deficits in ADHD: A

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Psychiatry

Background:

  • Alpha band neural oscillations (8-12 Hz) are crucial for attention control systems.
  • Deficits in attention are characteristic of neuropsychiatric conditions like attention deficit hyperactivity disorder (ADHD).

Purpose of the Study:

  • To investigate the correlation between visual encoding-related alpha event-related desynchronization (ERD) and fronto-parieto-occipital connectivity.
  • To determine if this correlation is disrupted in individuals with ADHD during spatial working memory (SWM) tasks.

Main Methods:

  • Simultaneous electroencephalography (EEG) and functional magnetic resonance imaging (fMRI) were acquired from 30 boys (15 with ADHD, aged 12-16) during SWM encoding.
  • Psychophysiological connectivity analyses were employed to examine brain activity and connectivity patterns.

Main Results:

  • Alpha ERD during SWM encoding correlated with occipital activation and fronto-parieto-occipital functional connectivity, supporting its role in top-down network interactions.
  • In ADHD, alpha ERD showed a weaker association with occipital activity but a stronger association with fronto-parieto-occipital connectivity, suggesting a compensatory attentional response.
  • MRI-amplified motion artifacts significantly degraded EEG data quality, correlated with hyperactivity and ADHD Combined Type, posing a limitation for EEG-fMRI studies in mobile populations.

Conclusions:

  • Alpha ERD is linked to brain network interactions involved in attention, expanding on previous findings of occipital activation.
  • Altered connectivity patterns in ADHD may reflect compensatory mechanisms during SWM.
  • Motion artifacts in EEG-fMRI present a significant challenge for research involving hypermobile populations, potentially biasing results.