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Exploring the Role of Deontic Reasoning and World Knowledge in Wason´s Selection Task
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Task-driven visual exploration at the foveal scale.

Natalya Shelchkova1, Christie Tang2, Martina Poletti3

  • 1Department of Neuroscience, University of Rochester Medical Center, Rochester, NY 14627.

Proceedings of the National Academy of Sciences of the United States of America
|March 3, 2019
PubMed
Summary
This summary is machine-generated.

Visual exploration occurs at the foveal scale, guided by task goals. Even during fixation, fine-grained priority maps direct microsaccades for detailed vision.

Keywords:
face perceptionfine spatial visionmicrosaccadesocular driftpriority maps

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Area of Science:

  • Neuroscience
  • Vision Science
  • Ophthalmology

Background:

  • Humans use saccades for visual exploration, focusing on the foveola for high acuity.
  • Previous research highlights the role of microsaccades in fine spatial vision.
  • Everyday tasks involve complex foveal stimuli, suggesting exploration at this scale.

Purpose of the Study:

  • To investigate task-driven visual exploration during fixation pauses.
  • To determine if spatial scanning occurs at the foveal scale.

Main Methods:

  • Observers judged facial expressions at a foveal scale (approx. 1°).
  • A custom system tracked gaze position at high resolution.
  • Microsaccades and large saccades were analyzed during fixation.

Main Results:

  • Active, task-driven spatial exploration was observed at the foveal scale.
  • Scanning strategies at the foveal scale mirrored those used for larger scenes.
  • Individual scanning idiosyncrasies were consistent across spatial scales.

Conclusions:

  • The visual system employs foveal-scale exploration during fixation.
  • A finer-grained priority map guides microsaccades for detailed foveal inspection.
  • This complements coarser priority maps used for guiding saccades to regions of interest.