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Related Experiment Videos

The effect of spatial cues on visual sensitivity.

Joshua A Solomon1

  • 1Department of Optometry and Visual Science, Applied Vision Research Centre, City University, Northampton Square, London EC1V 0HB, UK. j.a.solomon@city.ac.uk

Vision Research
|April 7, 2004
PubMed
Summary
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Visual precues enhance visual sensitivity, but this effect is small and not solely due to focal attention. There appears to be no capacity limit for how many positions can benefit from precues.

Area of Science:

  • Psychology
  • Neuroscience
  • Visual Perception

Background:

  • A consensus exists that visual sensitivity can be enhanced locally using precues.
  • Previous research indicated a sensitivity increase of less than 0.5 log units at precued locations.

Purpose of the Study:

  • To investigate the role of focal attention in visual sensitivity enhancement.
  • To determine if there are capacity limits to the precueing effect on visual sensitivity.

Main Methods:

  • Experiments using partially and totally valid precues.
  • Experiments employing non-informative precues.
  • Assessing visual sensitivity at single and multiple simultaneous positions.

Main Results:

Related Experiment Videos

  • The enhancement in visual sensitivity was less than 0.5 log units.
  • Most of the observed sensitivity enhancement was independent of focal attention.
  • Similar sensitivity enhancements were achieved when precuing one or eight positions simultaneously.
  • Valid and non-informative precues yielded comparable sensitivity increases.

    • Conclusions:

    • The enhancement of visual sensitivity by precues is a robust phenomenon.
    • Focal attention does not fully account for the benefits of precues.
    • The precueing effect on visual sensitivity shows no capacity limitation.