Psychological Research

, Volume 45, Issue 2, pp 147–156 | Cite as

Task and contrast effects on performance with parafoval stimulus pairs

  • Garvin Chastain
Article

Summary

The effect on both detection and identification of placing a non-target character to the foveal or peripheral side of the position of a parafoveally presented target character was examined in two experiments. The experiments found more interference with both tasks when the nontarget was peripheral to the target position, but only when the target and nontarget were both darker or brighter than the background. If one character was darker than the background, and the other was brighter, the asymmetry appeared in neither task. In Experiment 2, performance in both tasks was poorer when the two characters had the same features, but this effect was independent of both nontarget position and target-nontarget contrast. While these results are inconsistent with a feature-mixing explanation of the asymmetry, contrast-specific lateral inhibition can account for the phenomena.

Keywords

Target Position Lateral Inhibition Contrast Effect Stimulus Pair Target Character 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

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Copyright information

© Springer-Verlag 1983

Authors and Affiliations

  • Garvin Chastain
    • 1
  1. 1.Department of PsychologyBoise State UniversityBoiseUSA

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