R J Croft1, R J Barry. 1. Department of Behavioural & Cognitive Sciences, Imperial College of Science, Technology & Medicine, Charing Cross Hospital, St. Dunstan's Road, London, UK. r.croft@ic.ac.uk
Abstract
OBJECTIVE: The 'aligned-artefact average' (AAA) procedure was advanced by the authors as a technique suitable for removing eye movement-related artefacts 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 coefficients (Bs). However, recent evidence suggests that this simplification is not always accurate. Thus, we test here a revision of the AAA, including an appropriate allowance for the radial EOG (REOG) component, that does allow the use of the same Bs for the correction of blink and non-blink artefact. METHODS: Blink (and saccade) ERP data from 15 subjects were corrected using the AAA method, with Bs calculated from the same blink (and saccade) data set (referent waveforms), or a different set of blink (and saccade) data, or using the new revised AAA procedure (RAAA). RESULTS: AAA Bs calculated from saccades corrected blinks poorly (and 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 that irrespective of correction type, inclusion of REOG improved correction. CONCLUSION: EOG correction is more accurate when the radial channel is included, 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.
OBJECTIVE: The 'aligned-artefact average' (AAA) procedure was advanced by the authors as a technique suitable for removing eye movement-related artefacts 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 coefficients (Bs). However, recent evidence suggests that this simplification is not always accurate. Thus, we test here a revision of the AAA, including an appropriate allowance for the radial EOG (REOG) component, that does allow the use of the same Bs for the correction of blink and non-blink artefact. METHODS: Blink (and saccade) ERP data from 15 subjects were corrected using the AAA method, with Bs calculated from the same blink (and saccade) data set (referent waveforms), or a different set of blink (and saccade) data, or using the new revised AAA procedure (RAAA). RESULTS: AAA Bs calculated from saccades corrected blinks poorly (and 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 that irrespective of correction type, inclusion of REOG improved correction. CONCLUSION: EOG correction is more accurate when the radial channel is included, 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.
Authors: Nicholas R Cooper; Ignazio Puzzo; Adam D Pawley; Ruby A Bowes-Mulligan; Emma V Kirkpatrick; Pavlina A Antoniou; Steffan Kennett Journal: Cogn Affect Behav Neurosci Date: 2012-06 Impact factor: 3.282
Authors: Melinda L Jackson; Rodney J Croft; Katherine Owens; Robert J Pierce; Gerard A Kennedy; David Crewther; Mark E Howard Journal: Sleep Date: 2008-09 Impact factor: 5.849
Authors: Barry V O'Neill; Rodney J Croft; Sumie Leung; Chris Oliver; K Luan Phan; Pradeep J Nathan Journal: Psychopharmacology (Berl) Date: 2007-07-24 Impact factor: 4.530
Authors: Karin van der Hiele; Robert H A M Reijntjes; Alla A Vein; Rudi G J Westendorp; Mark A van Buchem; Eduard L E M Bollen; Huub A M Middelkoop; J Gert van Dijk Journal: Int J Alzheimers Dis Date: 2011-03-29
Authors: Lauren M Turner; Rodney J Croft; Andrew Churchyard; Jeffrey C L Looi; Deborah Apthorp; Nellie Georgiou-Karistianis Journal: PLoS One Date: 2015-09-25 Impact factor: 3.240