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Allocentric information is used for memory-guided reaching in depth: A virtual reality study.

Mathias Klinghammer1, Immo Schütz2, Gunnar Blohm3

  • 1Justus-Liebig-University, Experimental Psychology, Otto-Behaghel-Str. 10F, 35394 Giessen, Germany.

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|November 7, 2016
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Summary
This summary is machine-generated.

Humans use allocentric spatial information for memory-guided reaching in 3D space. Depth cues like retinal disparity, vergence, and object size are crucial for accurately coding target locations in three dimensions.

Keywords:
AllocentricDepth cuesMemory-guided reachingReference framesVirtual reality

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Human-Computer Interaction

Background:

  • Human spatial navigation relies on allocentric (world-centered) and egocentric (self-centered) frames of reference.
  • Previous research on allocentric coding for reaching is largely confined to two-dimensional (2D) environments.

Purpose of the Study:

  • To investigate allocentric coding of memorized reach targets in three-dimensional (3D) virtual reality.
  • To examine the role of binocular and monocular depth cues in coding object locations for 3D reaching.

Main Methods:

  • Participants explored a 3D scene with objects at varying distances.
  • Objects were shifted horizontally or in depth, with size manipulated to alter perceived depth.
  • Participants performed memory-guided reaches to a missing target location after a delay.

Main Results:

  • Reaching endpoints systematically deviated towards object shifts, particularly in depth.
  • Deviations in depth were stronger than in the horizontal plane and independent of observer-target distance.
  • Reaching endpoints correlated with changes in object size, indicating its role as a depth cue.

Conclusions:

  • Allocentric information is utilized for coding targets in memory-guided reaching within 3D space.
  • Binocular cues (retinal disparity, vergence) and monocular cues (object size) are vital for depth perception and target localization in 3D environments.