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Related Concept Videos

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The inner ear assumes dual functionalities of auditory perception and equilibrium maintenance. The vestibule is the organ responsible for balance. This organ contains mechanoreceptors, specifically hair cells, endowed with stereocilia, which aid in deciphering information regarding the position and motion of our heads. Two intrinsic components, the utricle and saccule, help perceive head position, while the semicircular canals track head movement. Neurological messages initiated in the...
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The vestibular system is a set of inner ear structures that provide a sense of balance and spatial orientation. This system is comprised of structures within the labyrinth of the inner ear, including the cochlea and two otolith organs—the utricle and saccule. The labyrinth also contains three semicircular canals—superior, posterior, and horizontal—that are oriented on different planes.
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Related Experiment Video

Updated: Mar 11, 2026

Using Eye-tracking to Assess the Relative Importance of Visual and Vestibular Input to Subcortical Motion Processing in the Roll Plane
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Spatiotopic coding during dynamic head tilt.

Kyriaki Mikellidou1, Marco Turi2,3, David C Burr4,5

  • 1Department of Translational Research on New Technologies in Medicine and Surgery, University of Pisa, Pisa, Italy; kmikellidou@gmail.com.

Journal of Neurophysiology
|December 2, 2016
PubMed
Summary
This summary is machine-generated.

Humans maintain visual stability despite head tilts. Research shows the brain uses spatiotopic coding, a world-centered map, to preserve our stable perception of the environment.

Keywords:
PMAEhead tiltretinotopicspatiotopic codingvisual stability

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Area of Science:

  • Neuroscience
  • Perception
  • Vision Science

Background:

  • Visual stability is maintained despite constant body and eye movements.
  • Head movements, especially frontal plane tilts, cause retinal image distortion.
  • The role of head movements in visual stability is less understood than eye movements.

Purpose of the Study:

  • To investigate the role of spatiotopic coding in maintaining visual stability during head tilts.
  • To differentiate between retinotopic and spatiotopic contributions to visual perception after head movements.

Main Methods:

  • Measured the positional motion aftereffect (PMAE) with large head tilts (∼42°) between adaptation and testing.
  • Dissociated retinal from allocentric (world-centered) coordinates.
  • Used different visual stimuli (Gaussian blobs vs. sinusoidal gratings) to assess retinotopic and spatiotopic components.

Main Results:

  • The positional motion aftereffect (PMAE) demonstrated both retinotopic and spatiotopic components after head tilts.
  • The retinotopic component of the PMAE was reduced with Gaussian blobs, while the spatiotopic component remained.
  • Spatial selectivity of the PMAE showed a significant spatiotopic component after head rotation.

Conclusions:

  • Perceptual stability is likely maintained, in part, by spatiotopic coding mechanisms.
  • Spatiotopic coding plays a crucial role in compensating for retinal image distortions caused by head movements.
  • The brain actively reconstructs a stable visual representation in allocentric coordinates.