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Related Experiment Videos

Exocentric pointing to opposite targets.

Jan J Koenderink1, Andrea J van Doorn, Joseph S Lappin

  • 1Utrecht University, Faculteit Natuur- en Sterrenkunde, Princetonplein 5, 3584 CC Utrecht, Netherlands. j.j.koenderink@phys.uu.nl

Acta Psychologica
|November 9, 2002
PubMed
Summary
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Observers showed two distinct ways of pointing to targets directly opposite them, influenced by their stance. This finding aligns with geometric models of visual perception and the horizon.

Area of Science:

  • Psychology
  • Neuroscience
  • Computer Vision

Background:

  • Understanding exocentric visual direction is crucial for human-computer interaction and robotics.
  • Previous models suggest the horizon's geometry influences visual perception.

Purpose of the Study:

  • To investigate exocentric visual directions to targets opposite an observer.
  • To determine how observers orient themselves to diametrically opposed targets.

Main Methods:

  • An exocentric pointing task was employed in the horizontal plane at eye height.
  • Observers used combined eye, head, and body movements to point.
  • Targets and pointers could not be viewed simultaneously.

Main Results:

Related Experiment Videos

  • Observers selected one of two distinct pointer orientations as visually correct for opposite targets.
  • The choice between orientations depended on the observer's stance.
  • The difference between acceptable orientations ranged from 5 to 10 degrees.

    • Conclusions:

    • Observer stance significantly influences exocentric pointing to opposite targets.
    • Results support a geometric model of the horizon as a Riemannian space.
    • The study provides empirical evidence for theoretical predictions in visual direction perception.