The functional significance of velocity storage and its dependence on gravity

Jean Laurens, Dora Angelaki

Research output: Contribution to journalArticle

Abstract

Research in the vestibular field has revealed the existence of a central process, called 'velocity storage', that is activated by both visual and vestibular rotation cues and is modified by gravity, but whose functional relevance during natural motion has often been questioned. In this review, we explore spatial orientation in the context of a Bayesian model of vestibular information processing. In this framework, deficiencies/ambiguities in the peripheral vestibular sensors are compensated for by central processing to more accurately estimate rotation velocity, orientation relative to gravity, and inertial motion. First, an inverse model of semicircular canal dynamics is used to reconstruct rotation velocity by integrating canal signals over time. However, its low-frequency bandwidth is limited to avoid accumulation of noise in the integrator. A second internal model uses this reconstructed rotation velocity to compute an internal estimate of tilt and inertial acceleration. The bandwidth of this second internal model is also restricted at low frequencies to avoid noise accumulation and drift of the tilt/translation estimator over time. As a result, low-frequency translation can be erroneously misinterpreted as tilt. The time constants of these two integrators (internal models) can be conceptualized as two Bayesian priors of zero rotation velocity and zero linear acceleration, respectively. The model replicates empirical observations like 'velocity storage' and 'frequency segregation' and explains spatial orientation (e.g., 'somatogravic') illusions. Importantly, the functional significance of this network, including velocity storage, is found during short-lasting, natural head movements, rather than at low frequencies with which it has been traditionally studied.

Original languageEnglish (US)
Pages (from-to)407-422
Number of pages16
JournalExperimental Brain Research
Volume210
Issue number3-4
DOIs
StatePublished - May 1 2011

Fingerprint

Gravitation
Noise
Semicircular Canals
Head Movements
Automatic Data Processing
Cues
Research
Spatial Orientation

Keywords

  • Bayes rule
  • Bayesian model
  • Eye movement
  • Internal model
  • Prior
  • Somatogravic illusion
  • Spatial orientation
  • Velocity storage
  • Vestibular
  • Vestibulo-ocular reflex

ASJC Scopus subject areas

  • Neuroscience(all)

Cite this

The functional significance of velocity storage and its dependence on gravity. / Laurens, Jean; Angelaki, Dora.

In: Experimental Brain Research, Vol. 210, No. 3-4, 01.05.2011, p. 407-422.

Research output: Contribution to journalArticle

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