ERP signatures of conscious and unconscious word and letter perception in an inattentional blindness paradigm |
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| Institution: | 1. Dept. of Psychology,University of Tartu,Kaarli Pst 3,Tallinn,10119,Estonia,talis.bachmann@ut.ee,+(372) (0) 627 1891;2. Department of Biomedical and Clinical Sciences,University of Milan,Italy,renate.rutiku@unimi.it;1. Department of Psychology, University of Nevada, Las Vegas, NV, USA;2. Department of Psychology, Reed College, Portland, OR, USA;1. Center for Cognitive Neuroscience, Duke University, Durham, NC, USA;2. Department of Psychology & Neuroscience, Duke University, Durham, NC, USA;3. Department of Psychiatry and Behavioral Sciences, Duke University Medical Center, Durham, NC, USA;4. Department of Neurobiology, Duke University Medical Center, Durham, NC, USA;1. School of Psychological Sciences, Faculty of Biomedical and Psychological Sciences, Monash University, Melbourne, VIC 3800, Australia;2. Monash Institute of Cognitive and Clinical Neurosciences, Monash University, Melbourne, VIC 3800, Australia;3. Department of Cognitive Neurology, University Medicine Goettingen, Robert-Koch-Strasse 40, 37075 Goettingen, Germany;4. German Primate Center, Leibniz Institute for Primate Research, Kellnerweg 4, 37077 Goettingen, Germany;5. German Research Foundation (DFG) Center for Nanoscale Microscopy and Molecular Physiology of the Brain (CNMPB), Georg-August-Universitaet Goettingen, 37073 Goettingen, Germany;6. Laboratory for Multimodal Neuroimaging (LMN), Department of Psychiatry, University of Marburg, 35039 Marburg, Germany;7. Brain and Cognition, Department of Psychology, University of Amsterdam, Amsterdam Brain and Cognition (ABC), The Netherlands;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 |
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| Abstract: | A three-phase inattentional blindness paradigm was combined with ERPs. While participants performed a distracter task, line segments in the background formed words or consonant-strings. Nearly half of the participants failed to notice these word-forms and were deemed inattentionally blind. All participants noticed the word-forms in phase 2 of the experiment while they performed the same distracter task. In the final phase, participants performed a task on the word-forms. In all phases, including during inattentional blindness, word-forms elicited distinct ERPs during early latencies (∼200–280 ms) suggesting unconscious orthographic processing. A subsequent ERP (∼320–380 ms) similar to the visual awareness negativity appeared only when subjects were aware of the word-forms, regardless of the task. Finally, word-forms elicited a P3b (∼400–550 ms) only when these stimuli were task-relevant. These results are consistent with previous inattentional blindness studies and help distinguish brain activity associated with pre- and post-perceptual processing from correlates of conscious perception. |
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| Keywords: | Inattentional blindness Word forms Orthographic processing Lexical processing VAN P3b Task-relevance |
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