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Examining Eye Movements in Visual Search through Clusters of Objects in a Circular Array.

Carrick C Williams1, Alexander Pollatsek2, Erik D Reichle3

  • 1Mississippi State University.

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|February 15, 2014
PubMed
Summary

This study shows visual search for a target "O" among Landolt "C"s in a ring array is a serial self-terminating search. Eye movements confirm serial processing, not influenced by gap size, extending findings beyond linear arrays.

Keywords:
ClustersEye MovementsVisual Search

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Area of Science:

  • Cognitive Psychology
  • Visual Perception
  • Human Factors

Background:

  • Visual search tasks often involve identifying targets within arrays of distractors.
  • Previous research suggests serial processing in linear visual search arrays.

Purpose of the Study:

  • To investigate the search strategy for a complete "O" within a circular array of Landolt "C"s.
  • To determine if visual search processing is serial in non-linear (circular) arrays.

Main Methods:

  • Participants searched for a target "O" in an array of eight clusters of four Landolt "C"s arranged in a ring.
  • Manual response times and eye movement data were recorded.
  • Gap size within Landolt "C"s varied between clusters but was constant within a cluster.

Main Results:

  • Manual response times indicated a serial self-terminating search.
  • Eye movement data revealed serial fixation of clusters (clockwise or counterclockwise).
  • Fixation times per cluster were independent of adjacent cluster gap sizes, supporting serial processing.

Conclusions:

  • Visual search in a circular array of Landolt "C"s follows a serial processing model.
  • Serial search patterns are not limited to linear arrays, extending previous findings.
  • Fixation durations reflect processing demands within each cluster during visual search.