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Depth Perception and Spatial Vision01:15

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Related Experiment Video

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MPI CyberMotion Simulator: Implementation of a Novel Motion Simulator to Investigate Multisensory Path Integration in Three Dimensions
09:46

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Published on: May 10, 2012

Multisensory space: from eye-movements to self-motion.

Frank Bremmer1

  • 1Department of Neurophysics, Philipps-University Marburg, Karl-v-Frisch-Str. 8a, D-35032 Marburg, Germany. frank.bremmer@physik.uni-marburg.de

The Journal of Physiology
|October 6, 2010
PubMed
Summary

Our brains maintain a stable perception of the world despite constant motion. Research in primates reveals how the posterior parietal cortex (PPC) integrates multisensory information for spatial awareness.

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Area of Science:

  • Neuroscience
  • Sensory Processing
  • Primate Vision

Background:

  • Perception of a stable world is challenged by constant self-motion and eye movements.
  • Self-motion generates multisensory flows (optical, tactile, auditory) that must be distinguished from external motion.
  • The posterior parietal cortex (PPC) is investigated for its role in multisensory spatial and motion encoding.

Purpose of the Study:

  • To functionally characterize the primate posterior parietal cortex (PPC).
  • To understand the role of the PPC in multisensory encoding of spatial and motion information.
  • To investigate the neural basis of perceptual phenomena related to self-motion.

Main Methods:

  • Extracellular recordings in macaque monkeys.
  • Functional magnetic resonance imaging (fMRI) studies in humans.
  • Psychophysical studies in humans.

Main Results:

  • Congruent visual, auditory, and tactile spatial representations were found in the ventral intraparietal area (VIP) of macaques during fixation.
  • Area VIP in humans was identified as the functional equivalent of macaque VIP.
  • Neural mechanisms underlying perceptual phenomena like heading detection and saccadic suppression were explored in the dorsal stream.

Conclusions:

  • The ventral intraparietal area (VIP) plays a key role in integrating multisensory spatial information.
  • The dorsal stream of the visual cortex is involved in processing self-motion-related perceptual phenomena.
  • Understanding PPC function is crucial for explaining stable perception during movement.