EOG correction of blinks with saccade coefficients: a test and revision ofthe aligned-artefact average solution

Objective: The 'aligned-artefact average' (AAA) procedure was advanced by t he authors as a technique suitable for removing eye movement-related artefa cts from the EEG. It was proposed that this method would correct both blink and non-blink artefact from the EEG, using the same set of correction coef ficients (Bs). However, recent evidence suggests that this simplification i s not always accurate. Thus, we test here a revision of the AAA, including an appropriate allowance for the radial EOG (REOG) component, that does all ow the use of the same Bs for the correction of blink and non-blink artefac t. Methods: Blink land saccade) ERP data from 15 subjects were corrected using the AAA method, with Bs calculated from the same blink land saccade! data set (referent waveforms). or a different set of blink land saccade) data, o r using the new revised AAA procedure (RAAA). Results: AAA Bs calculated from saccades corrected blinks poorly land vice versa). However, the RAAA Bs corrected blink ERPs better than blink-derived Bs. and saccade ERPs better than saccade-derived Bs. It was also Found tha t irrespective of correction type, inclusion of REOG improved correction. Conclusion: EOG correction is more accurate when the radial channel is incl uded, but inclusion of REOG (and/or HEOG) is not sufficient to resolve the discrepancy between blink and saccade correction. Using the RAAA procedure, both blink and non-blink data can be corrected using the same set of Bs. ( C) 2000 Elsevier Science Ireland Ltd. All rights reserved.