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Oscillation and Reaction Board Techniques for Estimating Inertial Properties of a Below-knee Prosthesis
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Gravito-inertial ambiguity resolved through head stabilization.

Ildar Farkhatdinov1,2, Hannah Michalska3, Alain Berthoz4

  • 1School of Electronic Engineering and Computer Science, Queen Mary University of London, Mile End, London, UK.

Proceedings. Mathematical, Physical, and Engineering Sciences
|April 23, 2019
PubMed
Summary
This summary is machine-generated.

Humans and animals stabilize heads during movement to estimate verticality, crucial for survival. Head stabilization ensures accurate perception of gravity and head acceleration, even without vision.

Keywords:
Head stabilizationfeedbacknonlinear observabilityverticalityvestibular system

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Area of Science:

  • Neuroscience
  • Biomechanics
  • Sensory Systems

Background:

  • Organisms spontaneously stabilize head orientation relative to gravity during movement, even without visual input.
  • Previous interpretations of this behavior have not emphasized the survival-critical need for robust verticality estimation.

Purpose of the Study:

  • To analyze if the head-vestibular system can render gravitational verticality 'observable' using a mechanistic model.
  • To investigate the role of head stabilization in enabling the estimation of head's angular position and acceleration from inertial measurements.

Main Methods:

  • Developed a mechanistic model of the head and otolith organ dynamics.
  • Analyzed the observability of verticality within the intrinsically nonlinear head-vestibular system.
  • Investigated the effect of feedback control on system observability.

Main Results:

  • The head-vestibular system generally lacks observability of verticality without orientation stabilization.
  • Head stabilization via feedback significantly alters the system's observability properties.
  • This demonstrates a peculiar nonlinear system behavior where feedback enhances observability.

Conclusions:

  • Head stabilization is hypothesized to be a central function enabling organisms to estimate gravitational verticality and head acceleration during locomotion.
  • This strategy is crucial for survival, allowing accurate navigation and movement in the absence of vision.
  • The findings highlight the importance of feedback in nonlinear systems for achieving essential sensory estimations.