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  • 1.
    Intaite, Monika
    et al.
    Visual Neuroscience Laboratory, IBILI, Faculty of Medicine, University of Coimbra, Coimbra, Portugal.
    Koivisto, Mika
    Centre for Cognitive Neuroscience, University of Turku, Turku, Finland / Department of Psychology, University of Turku, Turku, Finland.
    Revonsuo, Antti
    University of Skövde, School of Humanities and Informatics. University of Skövde, The Systems Biology Research Centre. Centre for Cognitive Neuroscience, University of Turku, Turku, Finland / Department of Psychology, University of Turku, Turku, Finland.
    Perceptual reversals of Necker stimuli during intermittent presentation with limited attentional resources2013In: Psychophysiology, ISSN 0048-5772, E-ISSN 1469-8986, Vol. 50, no 1, p. 82-96Article in journal (Refereed)
    Abstract [en]

    During prolonged viewing of ambiguous stimuli, such as Necker cubes, sudden perceptual reversals occur from one perceptual interpretation to another. The role of attention in such reversals is not clear. We tested whether perceptual reversals depend on attentional resources by manipulating perceptual load and recording event-related potentials (ERPs) during intermittent presentation of Necker stimuli. The results did not reveal any influence for perceptual load on the frequency of reversals. The ERPs showed that perceptual load influenced electrophysiological activity over parieto-central areas in the P1 time window (110–140 ms), but load did not modify the early enhancements of positivity (30–140 ms), which correlated with perceptual reversals at occipito-temporal sites. We conclude that disambiguation of ambiguous figures is based on early mechanisms that can work efficiently with only a minimal amount of attentional resources.

  • 2.
    Wilenius, Maria
    et al.
    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.
    Revonsuo, Antti
    University of Skövde, School of Humanities and Informatics.
    Timing of the earliest ERP correlate of visual awareness2007In: Psychophysiology, ISSN 0048-5772, E-ISSN 1469-8986, Vol. 44, no 5, p. 703-710Article in journal (Refereed)
    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.

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