June 2006
Volume 6, Issue 6
Free
Vision Sciences Society Annual Meeting Abstract  |   June 2006
Behavioral “baseline shift” effects of perceptual load
Author Affiliations
  • David Carmel
    Institute of Cognitive Neuroscience, University College London, UK, and Department of Psychology, University College London, UK
  • Geraint Rees
    Institute of Cognitive Neuroscience, University College London, UK, and Institute of Neurology, University College London, UK
  • Nilli Lavie
    Institute of Cognitive Neuroscience, University College London, UK, and Department of Psychology, University College London, UK
Journal of Vision June 2006, Vol.6, 297. doi:10.1167/6.6.297
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      David Carmel, Geraint Rees, Nilli Lavie; Behavioral “baseline shift” effects of perceptual load. Journal of Vision 2006;6(6):297. doi: 10.1167/6.6.297.

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Abstract

In all previous studies of perceptual load, high load was shown to modulate the processing of irrelevant stimuli that were always presented concurrently with the target. Here we report results from a new paradigm used to test the effect of perceptual load on detection of peripheral stimuli that were never presented concurrently with targets. Subjects performed either a feature search (monitoring for red crosses among other colors, low load) or a conjunction search (monitoring for upright yellow or inverted green crosses, high load), on a rapid succession of crosses presented at fixation. Results showed that detection sensitivity to peripheral stimuli presented during intervals between targets was reduced under high (compared with low) perceptual load. These results suggest that the mechanism for perceptual modulation by load involves baseline shifts in levels of spatial attention, which may be related to baseline shifts of neural activity in visual cortex (Kastner et al, Neuron 1999).

Carmel, D. Rees, G. Lavie, N. (2006). Behavioral “baseline shift” effects of perceptual load [Abstract]. Journal of Vision, 6(6):297, 297a, http://journalofvision.org/6/6/297/, doi:10.1167/6.6.297. [CrossRef]
Footnotes
 This research was supported by a Wellcome Trust grant to GR.
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