Journal of Computational Neuroscience

, Volume 35, Issue 2, pp 125–154 | Cite as

Striola magica. A functional explanation of otolith geometry

  • Mariella Dimiccoli
  • Benoît Girard
  • Alain Berthoz
  • Daniel Bennequin
Article

Abstract

Otolith end organs of vertebrates sense linear accelerations of the head and gravitation. The hair cells on their epithelia are responsible for transduction. In mammals, the striola, parallel to the line where hair cells reverse their polarization, is a narrow region centered on a curve with curvature and torsion. It has been shown that the striolar region is functionally different from the rest, being involved in a phasic vestibular pathway. We propose a mathematical and computational model that explains the necessity of this amazing geometry for the striola to be able to carry out its function. Our hypothesis, related to the biophysics of the hair cells and to the physiology of their afferent neurons, is that striolar afferents collect information from several type I hair cells to detect the jerk in a large domain of acceleration directions. This predicts a mean number of two calyces for afferent neurons, as measured in rodents. The domain of acceleration directions sensed by our striolar model is compatible with the experimental results obtained on monkeys considering all afferents. Therefore, the main result of our study is that phasic and tonic vestibular afferents cover the same geometrical fields, but at different dynamical and frequency domains.

Keywords

Otolith organs Striola Vestibular pathway 

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Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  • Mariella Dimiccoli
    • 1
  • Benoît Girard
    • 2
    • 3
  • Alain Berthoz
    • 4
  • Daniel Bennequin
    • 5
  1. 1.Laboratoire de Mathématiques Appliquées à Paris 5 (MAP5)Université Paris Descartes (Paris V)ParisFrance
  2. 2.Institut des Systèmes Intelligents et de Robotique (ISIR)Université Pierre et Marie Curie (Paris VI)ParisFrance
  3. 3.CNRS Institut des Systèmes Intelligents et de Robotique (ISIR)ParisFrance
  4. 4.Laboratoire de Physiologie de la Perception et de l’Action (LPPA)Collège-de-FranceParisFrance
  5. 5.Géométrie et dynamiqueUniversité Paris Diderot (Paris VII)ParisFrance

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