December 2002
Volume 2, Issue 10
Free
OSA Fall Vision Meeting Abstract  |   December 2002
Comparison of fMRI responses during discrimination under certainty and uncertainty conditions
Author Affiliations
  • James P. Thomas
    UCLA, Los Angeles, USA
    Hanse Institute for Advanced Study, Germany
  • Riklef Weerda
    University of Oldenburg, Oldenburg, Germany
  • J. Ignaocio
    Vallines University of Oldenburg, Oldenburg, Germany
  • Mark W. Greenlee
    University of Oldenburg, Oldenburg, Germany
Journal of Vision December 2002, Vol.2, 5. doi:10.1167/2.10.5
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      James P. Thomas, Riklef Weerda, J. Ignaocio, Mark W. Greenlee; Comparison of fMRI responses during discrimination under certainty and uncertainty conditions. Journal of Vision 2002;2(10):5. doi: 10.1167/2.10.5.

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

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Abstract

We obtained fMRI BOLD images of cortical activity while 6 subjects performed fine color and shape discriminations under conditions of stimulus certainty (monitor one dimension) and uncertainty (monitor both dimensions). Accuracy data divided the subjects into two distinct groups: 3 subjects maintained accuracy levels achieved in prior testing outside the scanner; 3 subjects dropped to lower levels, primarily in the color task. For the former group, the pattern of BOLD activity observed in the uncertainty condition resembled the union of patterns observed in certainty conditions, but for the latter group the uncertainty pattern differed widely from such a union. Possible implications for models of attention are discussed.

Thomas, J. P., Weerda, R., Vallines, J. I., Greenlee, M. W.(2002). Comparison of fMRI responses during discrimination under certainty and uncertainty conditions [Abstract]. Journal of Vision, 2( 10): 5, 5a, http://journalofvision.org/2/10/5/, doi:10.1167/2.10.5. [CrossRef]
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