May 2008
Volume 8, Issue 6
Free
Vision Sciences Society Annual Meeting Abstract  |   May 2008
A visual redundant-signal effect strongly depends on attention even for probability summation
Author Affiliations
  • Emmanuel Guzman
    Northwestern University and Institute for Neuroscience, and Universidad Nacional Autonoma de Mexico
  • German Palafox
    Universidad Nacional Autonoma de Mexico
  • Marcia Grabowecky
    Northwestern University and Institute for Neuroscience
  • Satoru Suzuki
    Northwestern University and Institute for Neuroscience
Journal of Vision May 2008, Vol.8, 135. doi:10.1167/8.6.135
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      Emmanuel Guzman, German Palafox, Marcia Grabowecky, Satoru Suzuki; A visual redundant-signal effect strongly depends on attention even for probability summation. Journal of Vision 2008;8(6):135. doi: 10.1167/8.6.135.

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

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Abstract

When two targets are associated with the same response in a speeded task, the response time is facilitated when both targets are simultaneously presented compared to when only one target is presented. This redundant-signal effect can be mediated by probability summation (race model) or by signal integration (co-activation) over and above probability summation. Previous results suggested that attending to redundant stimuli is necessary for signal integration. Here we report that probability summation also depends strongly on attention. We used stimuli that produced probability summation and manipulated attention using exogenous cueing (a flashed rectangle). A robust redundant-signal effect occurred in the attended condition where the redundant targets were presented within the cued region, but the effect was substantially reduced or absent in the ignored condition where the targets were presented in the un-cued region. Attention is thus crucial for a redundant-signal effect even for probability summation.

Guzman, E. Palafox, G. Grabowecky, M. Suzuki, S. (2008). A visual redundant-signal effect strongly depends on attention even for probability summation [Abstract]. Journal of Vision, 8(6):135, 135a, http://journalofvision.org/8/6/135/, doi:10.1167/8.6.135. [CrossRef]
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