Alpha-band suppression in the visual word form area as a functional bottleneck to consciousness
| Autor: | Pascal Fries, Jonathan Levy, Juan R. Vidal, Ian FitzPatrick, Jean-François Démonet, Robert Oostenveld |
|---|---|
| Přispěvatelé: | Imagerie cérébrale et handicaps neurologiques (ICHN), Institut des sciences du cerveau de Toulouse. (ISCT), Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-CHU Toulouse [Toulouse]-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-CHU Toulouse [Toulouse]-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Institut National de la Santé et de la Recherche Médicale (INSERM), The Gonda Multidisciplinary Brain Research Center, Bar-Ilan University [Israël], Pôle Neurosciences, CHU Toulouse [Toulouse]-Hôpital Purpan [Toulouse], CHU Toulouse [Toulouse], Centre de recherche en neurosciences de Lyon (CRNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Université Jean Monnet [Saint-Étienne] (UJM)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), Ernst Strüngmann Institute for Neuroscience in Cooperation (ESI), Max-Planck-Gesellschaft, Institut für Sprache und Information, Heinrich Heine Universität Düsseldorf = Heinrich Heine University [Düsseldorf], Centre Leenaards de la Mémoire (CLM), Centre Hospitalier Universitaire Vaudois [Lausanne] (CHUV), The present work was supported by both the European Science Foundation's European Young Investigator Award Program, and by the French Ministry scholarship. |
| Rok vydání: | 2013 |
| Předmět: |
Male
110 000 Neurocognition of Language Consciousness Brain activity and meditation Cognitive Neuroscience media_common.quotation_subject Biophysics Brain mapping 150 000 MR Techniques in Brain Function 050105 experimental psychology Young Adult 03 medical and health sciences 0302 clinical medicine Reading (process) Perception Alpha-band medicine Humans 0501 psychology and cognitive sciences Visual word form area media_common Brain Mapping Communication MEG medicine.diagnostic_test business.industry 120 000 Neuronal Coherence 05 social sciences Perspective (graphical) Brain Magnetoencephalography Neuronal oscillations Reading Neurology Visual Perception [SDV.NEU]Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC] Female 210 000 Language & Multilingualism business Psychology 030217 neurology & neurosurgery VWFA Cognitive psychology |
| Zdroj: | NeuroImage, 78, pp. 33-45 NeuroImage, 78, 33-45 NeuroImage NeuroImage, Elsevier, 2013, 78C, pp.33-45. ⟨10.1016/j.neuroimage.2013.04.020⟩ |
| ISSN: | 1053-8119 1095-9572 |
| DOI: | 10.1016/j.neuroimage.2013.04.020⟩ |
| Popis: | The current state of empirical investigations refers to consciousness as an all-or-none phenomenon. However, a recent theoretical account opens up this perspective by proposing a partial level (between nil and full) of conscious perception. In the well-studied case of single-word reading, short-lived exposure can trigger incomplete word-form recognition wherein letters fall short of forming a whole word in one's conscious perception thereby hindering word-meaning access and report. Hence, the processing from incomplete to complete word-form recognition straightforwardly mirrors a transition from partial to full-blown consciousness. We therefore hypothesized that this putative functional bottleneck to consciousness (i.e. the perceptual boundary between partial and full conscious perception) would emerge at a major key hub region for word-form recognition during reading, namely the left occipito-temporal junction. We applied a real-time staircase procedure and titrated subjective reports at the threshold between partial (letters) and full (whole word) conscious perception. This experimental approach allowed us to collect trials with identical physical stimulation, yet reflecting distinct perceptual experience levels. Oscillatory brain activity was monitored with magnetoencephalography and revealed that the transition from partial-to-full word-form perception was accompanied by alpha-band (7-11 Hz) power suppression in the posterior left occipito-temporal cortex. This modulation of rhythmic activity extended anteriorly towards the visual word form area (VWFA), a region whose selectivity for word-forms in perception is highly debated. The current findings provide electrophysiological evidence for a functional bottleneck to consciousness thereby empirically instantiating a recently proposed partial perspective on consciousness. Moreover, the findings provide an entirely new outlook on the functioning of the VWFA as a late bottleneck to full-blown conscious word-form perception. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect