November 2002
Volume 2, Issue 7
Free
Vision Sciences Society Annual Meeting Abstract  |   November 2002
Areas involved in figure-ground segregation based on luminance, colour, motion, and stereoscopic depth visualized with fMRI
Author Affiliations
  • Karoline Spang
    University of Bremen, Germany
  • Stephan Brandt
    University Hospital Charité of Berlin, Germany
  • Mike Morgan
    City University London, UK
  • Volker Diehl
    Radiology St. Juergen St, Bremen, Germany
  • Burkhard Terwey
    Radiology St. Juergen St, Bremen, Germany
  • Manfred Fahle
    University of Bremen, Germany
Journal of Vision November 2002, Vol.2, 471. doi:10.1167/2.7.471
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      Karoline Spang, Stephan Brandt, Mike Morgan, Volker Diehl, Burkhard Terwey, Manfred Fahle; Areas involved in figure-ground segregation based on luminance, colour, motion, and stereoscopic depth visualized with fMRI. Journal of Vision 2002;2(7):471. doi: 10.1167/2.7.471.

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

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Abstract

Figure-ground segregation is an important first step of visual object recognition. We compared the strength and distribution of cortical BOLD responses to the presentation of different figure-ground stimuli with that to homogeneous stimuli. The segregation was based on differences between figure and ground in either luminance, colour, motion or stereoscopic depth. In the case of colour- and luminance-based stimuli, figure and ground were either separated by an abrupt luminance or colour border or else defined by the arrangement of dots of different colour/luminance. Eight observers participated. Stimuli were presented by means of a video projector to the foot end of a Siemens Vision 1.5 Tesla scanner and flickered at 4 Hz. Stereoscopic stimuli were presented in red for the right and in green for the left eye and observers used red/green spectacles for this part of the experiment. Data were analysed using Brain Voyager software. Luminance and colour based figure-ground segregation were correlated with activation in both striate and extrastriate cortex. Motion- and stereo-based segregation, on the other hand, mostly activated extrastriate areas. So while figure-ground segregation based on different elementary features may share some common neuronal mechanism(s), a large part of activity for segregation not based on luminance or colour takes place in extrastriate areas, suggesting partly separate mechanisms for figure-ground segregation for different submodalities.

Spang, K., Brandt, S., Morgan, M., Diehl, V., Terwey, B., Fahle, M.(2002). Areas involved in figure-ground segregation based on luminance, colour, motion, and stereoscopic depth visualized with fMRI [Abstract]. Journal of Vision, 2( 7): 471, 471a, http://journalofvision.org/2/7/471/, doi:10.1167/2.7.471. [CrossRef]
Footnotes
 Supported by German Research Council (SFB 517).
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