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Related Experiment Videos

Saccadic search performance: the effect of element spacing.

Björn N S Vlaskamp1, Eelco A B Over, Ignace Th C Hooge

  • 1Psychonomics Department, Helmholtz Institute, Universiteit Utrecht, Heidelberglaan 2, The Netherlands. B.N.S.Vlaskamp@fss.uu.nl

Experimental Brain Research
|August 4, 2005
PubMed
Summary

Element spacing has a small effect on visual search time per element. Search performance is mainly impacted by target-distracter similarity, with crowding limiting elements processed per fixation.

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Area of Science:

  • Cognitive Psychology
  • Visual Perception

Background:

  • Element spacing is theorized to influence eye movement strategies during visual search.
  • Predicting the precise impact of spacing on search time per element is complex.

Purpose of the Study:

  • To investigate how element spacing affects search performance in a saccadic search task.
  • To determine the relationship between element spacing, target-distracter similarity, and search time per element.

Main Methods:

  • Experiment 1: Varied element spacing (3.4–7.1 degrees) and target-distracter similarity.
  • Experiment 2: Further reduced element spacing (0.8–3.2 degrees) to examine finer details.

Main Results:

  • Search time per element increased with target-distracter similarity.

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  • Decreasing element spacing initially reduced search time per element, but this effect was small.
  • No significant effect on search time per element was observed for spacings between 1.5 and 3.2 degrees.
  • Search time per element increased only when spacing became less than 1.5 degrees.

    • Conclusions:

    • Crowding appears to maintain a consistent number of elements processed per fixation, regardless of spacing.
    • Target-distracter similarity is a more dominant factor in visual search performance than element spacing within a certain range.