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The Functional Visual Field(s) in simple visual search.

Chia-Chien Wu1, Jeremy M Wolfe1

  • 1Harvard Medical School, Boston, MA, USA; Brigham & Women's Hospital, Boston, MA, USA.

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|November 14, 2021
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Summary
This summary is machine-generated.

Researchers explored the Functional Visual Field (FVF) during visual search tasks. They found the exploratory FVF is larger than the attentional FVF, explaining how targets can be missed.

Keywords:
AttentionEye movementsFunctional visual fieldVisual search

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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Visual Perception

Background:

  • During visual search, not all locations are fixated.
  • Processing is assumed to occur within a Functional Visual Field (FVF) around each fixation.

Purpose of the Study:

  • To investigate three distinct senses of the FVF: resolution, attentional, and exploratory.
  • To examine the attentional and exploratory FVFs using eye movements in visual search tasks.

Main Methods:

  • Collected eye movement data during visual search for a target letter or a color-orientation conjunction.
  • Defined the exploratory FVF by saccades not directed at the target.
  • Defined the attentional FVF by the saccade to the target, implying prior covert detection.

Main Results:

  • The exploratory FVF was consistently larger than the attentional FVF across all experiments.
  • The probability of saccading to the target remained below 1.0, even with close proximity and within estimated FVFs.

Conclusions:

  • Measuring search-based exploratory and attentional FVFs provides insight into why clearly visible targets may be missed.
  • The distinct sizes of attentional and exploratory FVFs highlight the dynamic nature of visual attention and exploration during search.