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The earliest electrophysiological correlate of visual awareness?
Univ Turku, Ctr Cognit Fdn, Turku 20014, Finland / Univ Turku, Dept Philosophy, Turku 20014, Finland.
Univ Turku, Ctr Cognit Fdn, Turku 20014, Finland / Univ Turku, Dept Psychol, Turku 20014, Finland.
Univ Copenhagen, Dept Psychol, DK-1361 Copenhagen K, Denmark.
Univ Copenhagen, Dept Psychol, DK-1361 Copenhagen K, Denmark.
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2008 (Engelska)Ingår i: Brain and Cognition, ISSN 0278-2626, E-ISSN 1090-2147, Vol. 66, nr 1, s. 91-103Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

To examine the neural correlates and timing of human visual awareness, we recorded event-related potentials (ERPs) in two experiments while the observers were detecting a grey dot that was presented near subjective threshold. ERPs were averaged for conscious detections of the stimulus (hits) and nondetections (misses) separately. Our results revealed that hits, as compared to misses, showed a negativity around 180–350 ms at occipital and posterior temporal sites. It was followed by a positive wave after 400–500 ms, peaking at parietal sites. These correlates were not affected by a manipulation of attention. The early negativity, called ‘visual awareness negativity’ (VAN), may be a general, primary electrophysiological correlate of visual awareness. The present data show that it can be observed in response to appearance of a stimulus in visual awareness and that it generalizes across different manipulations of stimulus visibility.

Ort, förlag, år, upplaga, sidor
Elsevier Inc. , 2008. Vol. 66, nr 1, s. 91-103
Nyckelord [en]
Attention, Awareness, Consciousness, Detection, EEG, ERT, Perception
Identifikatorer
URN: urn:nbn:se:his:diva-3597DOI: 10.1016/j.bandc.2007.05.010ISI: 000253518200011PubMedID: 17664036Scopus ID: 2-s2.0-38749148515OAI: oai:DiVA.org:his-3597DiVA, id: diva2:290814
Tillgänglig från: 2010-01-28 Skapad: 2010-01-28 Senast uppdaterad: 2017-12-12Bibliografiskt granskad

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