August 2010
Volume 10, Issue 7
Free
Vision Sciences Society Annual Meeting Abstract  |   August 2010
Studying object-based attention with a steady/pulsed-pedestal paradigm
Author Affiliations
  • Benjamin A. Guenther
    University of Georgia
  • James M. Brown
    University of Georgia
  • Shruti Narang
    University of Georgia
  • Aisha P. Siddiqui
    University of Georgia
Journal of Vision August 2010, Vol.10, 175. doi:10.1167/10.7.175
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      Benjamin A. Guenther, James M. Brown, Shruti Narang, Aisha P. Siddiqui; Studying object-based attention with a steady/pulsed-pedestal paradigm. Journal of Vision 2010;10(7):175. doi: 10.1167/10.7.175.

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Abstract

The steady/pulsed-pedestal paradigm has been shown to be an effective manipulation of relative magnocellular (M) and parvocellular (P) activity (e.g., Leonova, Pokorny, & Smith, 2003; McAnany & Levine, 2007). However, this manipulation has primarily been used with contrast sensitivity measures. The purposes of the present study were to evaluate the effectiveness of this manipulation using a simple reaction time (RT) measure and then test previous findings showing specific influences on space- and object-based attention under M- and P-biased conditions. Cuing studies investigating object-based attention have shown the cost for shifting attention within an object is less than equidistant shifts between two objects (object advantage = within-object RTs <between-object RTs). We previously reported this object advantage is eliminated under equiluminant (P-biased) conditions because of increased within-object RTs (Boyd, Guenther, & Brown, VSS 2007). The first experiment measured simple RTs to a square target presented at center screen on a square pedestal (20% catch trials) to see if the pulsed-pedestal would cause increased RTs expected from P-biased conditions. The steady/pulsed-pedestal manipulation produced reliable differences in RTs consistent with M- and P-biased conditions with overall RTs longer for the pulsed (P-biased) compared to the steady (M-biased) pedestal condition. A second experiment tested for an object advantage using pairs of rectangular bars (tilted 45° left or right of vertical) as objects. Again overall RTs were greater for pulsed compared to steady pedestal conditions. A similar magnitude validity effect (valid RTs <invalid RTs) was found for both conditions indicating that, in general, the pulsed condition did not interfere with shifting attention. However, the pulsed condition had a greater influence on RTs for within- compared to between-object shifts. Similar to our previous study, RTs for within-object shifts increased for P-biased conditions eliminating the object advantage.

Guenther, B. A. Brown, J. M. Narang, S. Siddiqui, A. P. (2010). Studying object-based attention with a steady/pulsed-pedestal paradigm [Abstract]. Journal of Vision, 10(7):175, 175a, http://www.journalofvision.org/content/10/7/175, doi:10.1167/10.7.175. [CrossRef]
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