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Related Experiment Video

Updated: Feb 5, 2026

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Variability in the Vestibulo-Ocular Reflex and Vestibular Perception.

Sirine Nouri1, Faisal Karmali2

  • 1Jenks Vestibular Physiology Laboratory, Massachusetts Eye and Ear Infirmary, Boston, MA, USA; Department of Otolaryngology, Harvard Medical School, Boston, MA, USA; Ecole Centrale Lyon, Lyon, France.

Neuroscience
|September 7, 2018
PubMed
Summary

Neural noise impacts the vestibular system, affecting self-motion, gaze, and posture. This study quanties vestibular imprecision from neural noise, revealing similar increases in vestibulo-ocular reflex (VOR) variability and perceptual differences with stimulus intensity.

Keywords:
just-noticeable differencenoisevestibularvestibulo-ocular reflex

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Area of Science:

  • Neuroscience
  • Vestibular System Research
  • Human Motor Control

Background:

  • The vestibular system is crucial for self-motion estimation, gaze stabilization, and posture maintenance.
  • Neural noise affects vestibular pathways at sensory, central, and motor levels, impacting behavior.
  • The precise behavioral consequences of neural noise in human vestibular pathways remain incompletely understood.

Purpose of the Study:

  • To characterize vestibular imprecision arising from neural noise in human subjects.
  • To measure the impact of stimulus intensity on vestibulo-ocular reflex (VOR) variability and perceptual just-noticeable differences (JNDs).

Main Methods:

  • Measured trial-to-trial VOR variability and perceptual JNDs in human participants.
  • Utilized head-centered yaw rotations across a wide range of motion velocities (1-65°/s for VOR, 3-90°/s for JNDs).
  • Employed stimuli manipulating velocity, displacement, and acceleration relationships to identify salient cues.

Main Results:

  • VOR variability increased with stimulus velocity, showing a stimulus-independent range at low velocities (<1°/s).
  • Perceptual imprecision (sigma) also increased significantly with stimulus intensity.
  • Both VOR variability and perceptual imprecision rose with stimulus intensity, suggesting a common neural noise source.

Conclusions:

  • Vestibular imprecision, measured by VOR variability and perceptual JNDs, increases with stimulus intensity.
  • Findings suggest a common noise source impacting both motor and perceptual vestibular pathways.
  • Observed stimulus-dependent imprecision is unlikely solely due to afferent non-linearities.