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Principal component analysis for reduction of ocular artefacts in event-related potentials of normal and dyslexic children

STS Instructor Authored by Giuseppe A. Chiarenza

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Check out this Knowledge Base article from StressTherapy Solutions: Principal component analysis for reduction of ocular artefacts in event-related potentials of normal and dyslexic children.

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Study at a glance

Area
QEEG, Methods & Mechanisms
Authors
Casarotto S, Bianchi AM, Cerutti S, Chiarenza GA
Journal
Clinical Neurophysiology
Year
2004
Population
Children
Protocol
PCA-based ocular artefact reduction in event-related potentials (10 EEG sites plus EOG)

Key findings

  • Recovered about 41% (passive) and 39% (active reading) of rejected trials in typical children
  • Recovered about 37% and 32% of rejected trials in dyslexic children
  • Validated on both simulated and real recordings
  • Improves ERP quality and can shorten recording sessions

DOI 10.1016/j.clinph.2003.10.018 → PubMed 15036057 →

Eye movements and blinks often spoil EEG trials, forcing many to be thrown away, which is a particular problem when recording children. This technical study tested a principal component analysis method that removes the component most strongly matching the eye channel, first on simulated data and then on recordings from typical and dyslexic children doing letter and symbol reading tasks. The method recovered roughly a third to two-fifths of trials that would otherwise have been rejected, giving cleaner averages and shorter recording times.