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Related Experiment Videos

How important is lateral masking in visual search?

A H Wertheim1, I T C Hooge, K Krikke

  • 1Department of Psychonomics, Faculty of Social Sciences, Utrecht University, Heidelberglaan 2, 3584 Utrecht, The Netherlands. a.wertheim@fss.uu.nl

Experimental Brain Research
|December 6, 2005
PubMed
Summary

Lateral masking, a sensory phenomenon, explains visual search effects previously attributed to cognitive attention. Experiments demonstrate its significant role in visual search performance and asymmetry.

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Area of Science:

  • Visual perception
  • Cognitive psychology
  • Sensory neuroscience

Background:

  • Visual search phenomena are often explained by cognitive attentional mechanisms.
  • Lateral masking is a sensory phenomenon that can influence visual perception.

Purpose of the Study:

  • To investigate whether lateral masking can explain visual search phenomena.
  • To differentiate between sensory and cognitive explanations for visual search.

Main Methods:

  • Five experiments comparing visual search tasks with lateral masking measurements.
  • Manipulation of factors like distractor number, density, search type, and array asymmetry.
  • Analysis of search times, lateral masking scores, eye movements, and error rates.

Main Results:

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  • Factors affecting visual search times also affected lateral masking scores.
  • Reduced distractor density decreased the disjunction-conjunction difference and asymmetry.
  • Lateral masking scores mirrored the asymmetry observed in visual search.
  • Findings were not explained by differences in attentional grain size.

Conclusions:

  • The sensory mechanism of lateral masking is a significant factor in visual search.
  • Many visual search effects traditionally attributed to cognitive attention may be sensory in origin.
  • Lateral masking offers a parsimonious explanation for established visual search phenomena.