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This study shows that allocentric coding (relative to landmarks) decreases with distance but remains significant. Egocentric and allocentric cues combine based on distance, influencing spatial coding.

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Area of Science:

  • Cognitive Neuroscience
  • Spatial Cognition
  • Visual Perception

Background:

  • Human spatial navigation relies on both egocentric (self-centered) and allocentric (environment-centered) reference frames.
  • Understanding how these coding systems interact and their spatial range is crucial for explaining spatial memory and behavior.

Purpose of the Study:

  • To investigate the spatial range of allocentric coding relative to landmark distance.
  • To examine the interaction rules between allocentric and egocentric coding across varying target-landmark distances.

Main Methods:

  • A memory-based pointing task using visual targets superimposed on city landscapes.
  • Variable occlusion of background images to control target-landmark distances.
  • Introduction of subliminal conflicts between allocentric and egocentric frames via image shifts.

Main Results:

  • The influence of allocentric coding diminished as target-landmark distances increased (>=10°).
  • Allocentric coding remained statistically significant even at the largest tested distances.
  • Pointing response variability increased with target-landmark distance.

Conclusions:

  • Allocentric spatial coding's influence decreases with distance but persists.
  • A Bayesian model accurately describes the combination of egocentric and allocentric cues, governed by a coupling prior, as a function of distance.