Awareness in the crowd: Beta power and alpha phase of prestimulus oscillations predict object discrimination in visual crowding |
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| Affiliation: | 1. Center for Mind/Brain Sciences (CIMeC), University of Trento, Rovereto, TN, Italy;2. Scientific Institute IRCCS “E. Medea”, Bosisio Parini, Lecco, Italy;3. International School for Advanced Studies (SISSA), Trieste, Italy;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. CIAE, Centro de Investigación Avanzada en Educación, Universidad de Chile, 8330014 Santiago, Chile;2. School of Psychology, Pontificia Universidad Católica de Chile, 8940000 Santiago, Chile;3. School of Education, Universidad Mayor, 7500994 Santiago, Chile;1. Centre for Brain Science, Department of Psychology, University of Essex, Wivenhoe Park, Colchester CO4 3SQ, UK;2. Institute of Neuroscience and Psychology, University of Glasgow, 58 Hillhead Street, Glasgow G12 8QB, UK;3. UCL Institute of Cognitive Neuroscience, University College London, 17 Queen Square, London WC1N 3AR, UK;4. Wellcome Trust Centre for Neuroimaging at UCL, University College London, 12 Queen Square, London WC1N 3BG, UK;1. Ernst Strüngmann Institute (ESI) for Neuroscience in Cooperation with Max Planck Society, Deutschordenstraße 46, 60528 Frankfurt, Germany;2. Department of Psychology, the Hebrew University of Jerusalem, Mt. Scopus, Jerusalem 9190501 Israel;3. Donders Institute for Brain, Cognition and Behaviour, Kapittelweg 29, 6525 EN Nijmegen, the Netherlands |
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| Abstract: | Visual crowding is among the factors that most hamper conscious object perception. However, we currently ignore the neural states that predispose to an accurate perception within different crowding regimes. Here, we performed single-trial analyses of the electroencephalographical (EEG) oscillations, evaluating the prestimulus power and phase differences between correct and incorrect discrimination during a letter-crowding task, where irrelevant letters were placed nearby (strong crowding) or far (mid crowding) relative to the target. Results show that prestimulus alpha (8–12 Hz) power was related to target discrimination in the mid, but not in the strong, crowding condition. Importantly, accurate discrimination in the strong crowding condition was predicted by the phase of alpha and by the power of beta (13–20 Hz) oscillations. These evidence suggest that both periodic visual sampling mechanisms, reflected in the alpha phase, and network predisposition to extract local information, reflected in the beta power, predispose to object discrimination in a crowded scene. |
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| Keywords: | Perception Consciousness Peripheral vision Letter processing Dyslexia Autism |
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