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Related Concept Videos

The Vestibular System01:29

The Vestibular System

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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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Equilibrium and Balance01:15

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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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A random variable is a single numerical value that indicates the outcome of a procedure. The concept of random variables is fundamental to the probability theory and was introduced by a Russian mathematician, Pafnuty Chebyshev, in the mid-nineteenth century.
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An experiment often consists of more than a single step. In this case, measurements at each step give rise to uncertainty. Because the measurements occur in successive steps, the uncertainty in one step necessarily contributes to that in the subsequent step. As we perform statistical analysis on these types of experiments, we must learn to account for the propagation of uncertainty from one step to the next. The propagation of uncertainty depends on the type of arithmetic operation performed on...
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Random or indeterminate errors originate from various uncontrollable variables, such as variations in environmental conditions, instrument imperfections, or the inherent variability of the phenomena being measured. Usually, these errors cannot be predicted, estimated, or characterized because their direction and magnitude often vary in magnitude and direction even during consecutive measurements. As a result, they are difficult to eliminate. However, the aggregate effect of these errors can be...
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Scientists always try their best to record measurements with the utmost accuracy and precision. However, sometimes errors do occur. These errors can be random or systematic. Random errors are observed due to the inconsistency or fluctuation in the measurement process, or variations in the quantity itself that is being measured. Such errors fluctuate from being greater than or less than the true value in repeated measurements. Consider a scientist measuring the length of an earthworm using a...
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Related Experiment Video

Updated: Mar 12, 2026

Using Unidirectional Rotations to Improve Vestibular System Asymmetry in Patients with Vestibular Dysfunction
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Acute peripheral vestibular deficit increases redundancy in random number generation.

Ivan Moser1,2, Dominique Vibert3, Marco D Caversaccio3

  • 1Department of Psychology, University of Bern, Fabrikstrasse 8, Bern, 3012, Switzerland. ivan.moser@psy.unibe.ch.

Experimental Brain Research
|November 17, 2016
PubMed
Summary

Peripheral vestibular deficit impacts cognitive functions. This study found that while number representation wasn't biased, patients showed impaired executive functions, particularly during head turns, suggesting a new assessment method.

Keywords:
Executive functionsNumerical cognitionRandom number generationSpatial attentionVestibular deficit

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Vestibular System Research

Background:

  • Unilateral peripheral vestibular deficit causes spatial orientation biases and cognitive difficulties.
  • Vestibular patients often exhibit a spatial bias towards their affected ear in various orientation tasks.

Purpose of the Study:

  • To investigate the effect of acute peripheral vestibular deficit on the mental representation of numbers in space.
  • To assess executive functions in patients with peripheral vestibular deficit using a random number generation (RNG) task during static and dynamic head positions.

Main Methods:

  • Tested 43 patients with acute vestibular neuritis and 28 healthy controls using a random number generation task.
  • Evaluated performance during static head positions and active head turns.
  • Analyzed number space representation and executive function components, specifically updating.

Main Results:

  • No spatial bias in number representation was found in patients with peripheral vestibular deficit.
  • Increased redundancy in generated numbers was observed in patients during active head turns.
  • Patients demonstrated poorer performance in generating random number sequences, indicating deficits in executive function updating.

Conclusions:

  • Acute peripheral vestibular deficit does not appear to bias number space representation.
  • Executive functions, particularly the updating component, are impaired in patients with peripheral vestibular deficit, especially during head movements.
  • Random number generation is a promising, cost-effective tool for assessing executive functions in vestibular disorder patients.