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The role of levels of processing in disentangling the ERP signatures of conscious visual processing
Affiliation:1. Consciousness Lab, Institute of Psychology, Jagiellonian University, Kraków, Poland;2. Consciousness, Cognition and Computation Group, Université Libre de Bruxelles, Brussels, Belgium;3. Psychophysiology Laboratory, Institute of Psychology, Jagiellonian University, Kraków, Poland;1. Consciousness Lab, Institute of Psychology, Jagiellonian University, Krakow, Poland;2. SWPS University of Social Sciences and Humanities, Katowice Faculty of Psychology, Katowice, Poland;3. School of Psychology, King''s College, University of Aberdeen, Aberdeen, Scotland, United Kingdom;1. Institute of Psychology, University of Tartu, Näituse 2, Tartu 50409, Estonia;2. Institute of Public Law, University of Tartu, Teatri väljak 3-207, Tallinn 10143, Estonia;3. Institute of Computer Science, University of Tartu, J. Liivi 2, Tartu 50409, Estonia;1. Department of Psychology, University of Turku, Finland;2. Centre for Cognitive Neuroscience, University of Turku, Finland;3. Turku Brain and Mind Centre, University of Turku, Finland;1. Consciousness Lab, Institute of Psychology, Jagiellonian University, Kraków, Poland;2. Consciousness, Cognition and Computation Group, Université Libre de Bruxelles, Brussels, Belgium;3. Warsaw School of Social Science and Humanities, Faculty in Katowice, Poland;1. Psychophysiology Laboratory, Institute of Psychology, Jagiellonian University, Kraków, Poland;2. Consciousness, Cognition and Computation Group, Center for Research in Cognition, Université Libre de Bruxelles, Brussels, Belgium;3. Centre for Modern Interdisciplinary Technologies, Nicolaus Copernicus University, Toruń, Poland;4. Consciousness Lab, Institute of Psychology, Jagiellonian University, Kraków, Poland
Abstract:We aimed to distinguish electrophysiological signatures of visual awareness from other task-related processes through manipulating the level of processing of visual stimuli. During an event-related EEG experiment, 36 subjects performed either color (low-level condition) or magnitude (high-level condition) evaluations of masked digits. Participants also assessed subjective visibility of each stimulus using the Perceptual Awareness Scale (PAS). Mean amplitude of the components of interest was analyzed (VAN − 140–240 ms; LP − 380–480 ms) with weighted regression mixed model. In the VAN component time window the mean amplitude correlated with PAS rating in both conditions. Mean amplitude in the LP time window correlated with PAS ratings in the high-level condition, but not in the low-level condition. Our results support the temporal unfolding of ERP makers of conscious processing, with an early component reflecting the initial perceptual experience and a late component being a correlate of the conscious experience of non-perceptual information.
Keywords:Neural correlates of consciousness  Visual masking  Consciousness  Awareness  Vision  Levels of processing  Event-related potentials  Contrastive analysis  EEG
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