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Timing of the earliest ERP correlate of visual awareness
Center for Cognitive Neuroscience, University of Turku, Turku, Finland / Department of Psychology, Åbo Akademi University, Turku, Finland / Center for Cognitive Neuroscience, University of Turku, FIN-20014 Turku, Finland.
Högskolan i Skövde, Institutionen för kommunikation och information.ORCID-id: 0000-0002-2771-1588
2007 (Engelska)Ingår i: Psychophysiology, ISSN 0048-5772, E-ISSN 1469-8986, Vol. 44, nr 5, s. 703-710Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The earliest reliably occurring event-related brain potential (ERP) correlate of visual awareness (visual awareness negativity, VAN) emerges after 100 ms and peaks between 200 and 300 ms from stimulus onset. In a study using low-contrast stimuli, VAN was significantly delayed, peaking at 460 ms (V. Ojanen, A. Revonsuo, & M. Sams, 2003). In that study physical differences between the conscious and nonconscious stimuli may have confounded the results. Here we explored whether VAN is similarly delayed for physically identical stimuli. We presented low-contrast stimuli near an individually determined subjective contrast threshold. A delayed VAN peaked at 400 ms at occipito-temporal sites to subjectively perceived stimuli. Our results support the interpretation that VAN is the earliest ERP correlate of phenomenal visual awareness. The electrophysiological processes eliciting VAN may become delayed as a function of the difficulty of the early perceptual discrimination.

Ort, förlag, år, upplaga, sidor
Blackwell Publishing, 2007. Vol. 44, nr 5, s. 703-710
Nyckelord [en]
Consciousness, Neural correlates of visual awareness, Perceptual threshold, Vision, Human electroencephalogram, Event-related potentials, Visual awareness negativity, Recurrent processing
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URN: urn:nbn:se:his:diva-1454DOI: 10.1111/j.1469-8986.2007.00546.xISI: 000249002200005PubMedID: 17584186Scopus ID: 2-s2.0-34547854733OAI: oai:DiVA.org:his-1454DiVA, id: diva2:25382
Tillgänglig från: 2008-09-26 Skapad: 2008-09-26 Senast uppdaterad: 2017-12-13Bibliografiskt granskad

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