August 2012
Volume 12, Issue 9
Free
Vision Sciences Society Annual Meeting Abstract  |   August 2012
Are the neural correlates of conscious contents stable or plastic?
Author Affiliations
  • Kristian Sandberg
    Cognitive Neuroscience Research Unit, Aarhus University Hospital\nInstitute of Cognitive Neuroscience, University College London
  • Morten Overgaard
    Cognitive Neuroscience Research Unit, Aarhus University Hospital\nCognitive Neuroscience Research Unit, Dept. of Communication and Psychology, Aalborg University
  • Geraint Rees
    Institute of Cognitive Neuroscience, University College London\nWellcome Trust Centre for Neuroimaging, Institute of Neurology, University College London
Journal of Vision August 2012, Vol.12, 115. doi:10.1167/12.9.115
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      Kristian Sandberg, Morten Overgaard, Geraint Rees; Are the neural correlates of conscious contents stable or plastic?. Journal of Vision 2012;12(9):115. doi: 10.1167/12.9.115.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract
 

It is often an implicit assumption of consciousness research that the neural correlate of a particular conscious experience is both universal (shared between subjects) and stable over time. Recently, we demonstrated that the first assumption is only partially true, and in the present study we examine the second assumption. We recorded the magnetoencephalographic (MEG) signal from healthy human participants while they viewed an intermittently presented binocular rivalry stimulus consisting of a face and a grating. During binocular rivalry, the stimulus is kept constant, but the conscious content alternates between two possibilities. Using a multivariate classification algorithm, we found that it was possible to predict the conscious experience of a participant from early event-related field components (100-300ms after stimulus presentation) using data gathered on different trials of the same recording session. Very similar accuracies were obtained when the data used to train and test the classifier were gathered on different days within a week. However, when training/testing data were separated by 2.5 years, prediction accuracy was reduced drastically, to a level comparable to when the classifier was trained on a different participant. We discuss whether this drop in accuracy can best be explained by changes in the predictive signal in terms of timing, topography or underlying sources. Our results thus show that the neural correlates of conscious perception of a particular stimulus are stable within a time frame of days, but not across years. This may be taken as an indication that our experience of the same visual stimulus changes slowly across long periods of time, or alternatively the results may be understood in terms of multiple realizability.

 

Meeting abstract presented at VSS 2012

 
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