Human visual search does not maximize the post-saccadic probability of identifying targets

Camille Morvan, Laurence T. Maloney

Research output: Contribution to journalArticle

Abstract

Researchers have conjectured that eye movements during visual search are selected to minimize the number of saccades. The optimal Bayesian eye movement strategy minimizing saccades does not simply direct the eye to whichever location is judged most likely to contain the target but makes use of the entire retina as an information gathering device during each fixation. Here we show that human observers do not minimize the expected number of saccades in planning saccades in a simple visual search task composed of three tokens. In this task, the optimal eye movement strategy varied, depending on the spacing between tokens (in the first experiment) or the size of tokens (in the second experiment), and changed abruptly once the separation or size surpassed a critical value. None of our observers changed strategy as a function of separation or size. Human performance fell far short of ideal, both qualitatively and quantitatively.

Original languageEnglish (US)
Article numbere1002342
JournalPLoS Computational Biology
Volume8
Issue number2
DOIs
StatePublished - Feb 2012

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Saccades
Visual Search
Eye movements
Eye Movements
eyes
Maximise
Target
Observer
Minimise
Human Performance
Retina
Fixation
retina
Spacing
fixation
Experiment
Critical value
spacing
planning
researchers

ASJC Scopus subject areas

  • Cellular and Molecular Neuroscience
  • Ecology
  • Molecular Biology
  • Genetics
  • Ecology, Evolution, Behavior and Systematics
  • Modeling and Simulation
  • Computational Theory and Mathematics

Cite this

Human visual search does not maximize the post-saccadic probability of identifying targets. / Morvan, Camille; Maloney, Laurence T.

In: PLoS Computational Biology, Vol. 8, No. 2, e1002342, 02.2012.

Research output: Contribution to journalArticle

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