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Visual search: efficiency continuum or distinct processes?

N Haslam1, M Porter, L Rothschild

  • 1Department of Psychology, New School for Social Research, New York, New York 10003, USA. haslam@newschool.edu

Psychonomic Bulletin & Review
|February 19, 2002
PubMed
Summary
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Visual search may involve two distinct serial and parallel processes, not a single continuum. Reanalyzing past data with new statistical methods supports this two-process model of visual attention.

Area of Science:

  • Cognitive psychology
  • Visual perception
  • Attention studies

Background:

  • The nature of visual search has been debated, with models proposing either distinct serial and parallel processes or a single continuum of efficiency.
  • Previous research, notably Wolfe (1998), suggested a continuum model based on search slope distributions.

Purpose of the Study:

  • To re-examine the data used to support the visual search continuum model.
  • To determine whether visual search is best described by two distinct processes or a single continuum.

Main Methods:

  • Statistical reanalysis of a large dataset on visual search.
  • Application of statistical procedures designed to differentiate between continuous and discontinuous models.

Main Results:

Related Experiment Videos

  • The reanalysis, using more appropriate statistical methods, indicated that the data do not exclusively support a continuum model.
  • Evidence was found supporting the existence of two distinct processes in visual search.

Conclusions:

  • The findings challenge the continuum model of visual search.
  • The study supports a model where visual search operates via two distinct processes, rather than a single continuum.