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Exocentric pointing in depth.

Jan J Koenderink1, Andrea J van Doorn, Astrid M L Kappers

  • 1Department of Physics & Astronomy, Buys Ballot Laboratory, Utrecht University, Princetonplein 5, 3584CC Utrecht, The Netherlands. j.j.koenderink@phys.uu.nl

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|January 29, 2008
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Summary

Human pointing behavior often creates S-shaped curves, challenging the idea of a simple geometric "visual space." This finding suggests visual perception is more complex than previously modeled.

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Area of Science:

  • Psychology
  • Cognitive Science
  • Human Perception

Background:

  • The concept of

Purpose of the Study:

  • To investigate human pointing behavior in an exocentric task.
  • To compare pointing directions when target and pointer are exchanged.
  • To analyze the geometric properties of the resulting pointing paths.

Main Methods:

  • An exocentric pointing task was employed.
  • Human observers performed pointing tasks in an outdoor environment.
  • Distances ranged from one to over thirty meters under daylight conditions.

Main Results:

  • Pointing paths were analyzed for curvature, classifying them as "C-arcs" or "S-arcs."
  • Human observers predominantly generated S-arcs.
  • This indicates a deviation from simple geometric straight lines in visual space.

Conclusions:

  • The prevalence of S-arcs challenges the notion of visual space as a strict geometric entity.
  • Findings suggest that visual space may not be a simple, uniform geometric structure.
  • The study proposes extensions to visual space models to account for observed pointing behaviors, such as local adjustments near fixation.