The effect of automatic blink correction on auditory evoked potentials.
The effects of blink correction on auditory event-related potential (ERP) waveforms is assessed. Two blink correction strategies are compared. ICA-SSP combines independent component analysis (ICA) with signal space projection (SSP) and ICA-EMD uses empirical mode decomposition (EMD) to improve the performance of the standard ICA method. Five voluntary subjects performed an auditory oddball task. The resulting ERPs are used to compare the two blink correction methods to each other and against blink rejection. The results suggest that both methods qualitatively preserve the ERP waveform but that they underestimate some of the peak amplitudes. ICA-EMD performs slightly better than ICA-SSP. In conclusion, the use of blink correction is justified, especially if blink rejection leads to severe data loss.
Brain Work Research Centre, Finnish Institute of Occupational Health, Topeliuksenkatu 41 a A, 00250 Helsinki, Finland. jussi.korpela@ttl.fi
Jussi
J
Korpela
Ricardo
R
Vigário
Minna
M
Huotilainen
D000328:Adult; D000465:Algorithms; D016477:Artifacts; D001767:Blinking / Q000502:physiology*; D004569:Electroencephalography / Q000706:statistics & numerical data*; D004585:Electrooculography / Q000706:statistics & numerical data; D005072:Evoked Potentials, Auditory / Q000502:physiology*; D006801:Humans; D010865:Pilot Projects; D025341:Principal Component Analysis