May 2008
Volume 8, Issue 6
Free
Vision Sciences Society Annual Meeting Abstract  |   May 2008
Object- and location-based inhibition of return to superimposed surfaces
Author Affiliations
  • Marielle Johnson
    Centre for Vision Research, York University, and School of Kinesiology and Health Science, York University
  • Mazyar Fallah
    Centre for Vision Research, York University, and School of Kinesiology and Health Science, York University
  • Heather Jordan
    Centre for Vision Research, York University, and Department of Psychology, York University
Journal of Vision May 2008, Vol.8, 1112. doi:10.1167/8.6.1112
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      Marielle Johnson, Mazyar Fallah, Heather Jordan; Object- and location-based inhibition of return to superimposed surfaces. Journal of Vision 2008;8(6):1112. doi: 10.1167/8.6.1112.

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

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Abstract

Previous studies have suggested the existence of spatial and object-based Inhibition of Return (IOR) effects, and proposed that they are driven by separate mechanisms. These studies have exclusively used objects occurring in spatially separate locations. Thus the object-based effects could be mediated by a location-based mechanism. To control for location, we superimposed two objects (random dot kinetograms). This study examines whether IOR is present for objects that are superimposed or requires that the objects are separated in space. We modified the traditional dynamic IOR displays (Tipper et al, 1991) by placing 2 superimposed surfaces in each of two peripheral locations (left vs right). Location-based IOR was observed regardless whether the target appeared on the cued or uncued surface. Critically, object-based IOR was not present; instead we found evidence of object-based facilitatory effects. Thus location-based but not object-based IOR is found with superimposed surfaces. In Experiment 2, we asked whether spatial separation is necessary throughout the trial or at time of cueing. These results have implications for the relative roles of subcortical oculomotor (e.g. superior colliculus) and cortical substrates for mediating IOR.

Johnson, M. Fallah, M. Jordan, H. (2008). Object- and location-based inhibition of return to superimposed surfaces [Abstract]. Journal of Vision, 8(6):1112, 1112a, http://journalofvision.org/8/6/1112/, doi:10.1167/8.6.1112. [CrossRef]
Footnotes
 Funded by NSERC Discovery Grant.
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