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Related Experiment Videos

Visuospatial memory computations during whole-body rotations in roll.

S Van Pelt1, J A M Van Gisbergen, W P Medendorp

  • 1Nijmegen Institute for Cognition and Information, Radboud University Nijmegen, The Netherlands. s.vanpelt@nici.ru.nl

Journal of Neurophysiology
|April 29, 2005
PubMed
Summary

Spatial memory during body tilts is stored using an allocentric reference frame, likely gravity-based. This finding suggests the brain flexibly uses multiple reference frames for visuospatial memory based on sensory input and task demands.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Spatial Cognition

Background:

  • The brain must represent spatial information relative to the self (egocentric) or the external world (allocentric).
  • Understanding how spatial memories are encoded, especially during altered self-orientation, is crucial for explaining navigation and sensorimotor control.

Purpose of the Study:

  • To investigate whether visuospatial memories are stored in egocentric or allocentric coordinates during whole-body rotations.
  • To determine if allocentric distortions, like those in perceiving gravity, influence spatial memory recall after body tilt.

Main Methods:

  • A memory-saccade task was employed with participants making eye movements to remembered targets after passive whole-body rotations in roll.
  • Participants experienced varying degrees of body tilt (-120 to 120 degrees) in darkness to assess gravity perception and spatial memory accuracy.

Related Experiment Videos

  • Systematic errors in saccade direction were measured and correlated with the amount of body rotation and subjective allocentric distortions.

    • Main Results:

    • Participants exhibited significant systematic directional errors in saccades (up to 90 degrees) towards remembered targets.
    • These errors were absent without intervening body rotation, ruling out simple memory decay.
    • Saccade errors strongly correlated with the degree of subjective allocentric distortion at initial and final body positions, not the amount of rotation itself.

    Conclusions:

    • The brain utilizes an allocentric reference frame, potentially anchored to gravity, for coding visuospatial memories during whole-body tilts.
    • This supports the concept that the brain dynamically employs multiple reference frames for spatial information processing, adapting to sensory cues and task requirements.