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Related Experiment Video

Updated: Mar 31, 2026

Assessment of Static Graviceptive Perception in the Roll-Plane using the Subjective Visual Vertical Paradigm
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Assessment of Static Graviceptive Perception in the Roll-Plane using the Subjective Visual Vertical Paradigm

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Assessing the visual vertical: how many trials are required?

C Piscicelli1,2, S Nadeau3, J Barra4

  • 1Département de Rééducation Neurologique, Centre Hospitalier Universitaire de Grenoble, Grenoble, France. CPiscicelli@chu-grenoble.fr.

BMC Neurology
|October 24, 2015
PubMed
Summary
This summary is machine-generated.

Determining the number of trials for consistent visual vertical (VV) assessment in stroke patients is crucial. Six trials suffice for identifying VV biases, while ten are needed for accurate measurement in non-selected stroke patients.

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Area of Science:

  • Neuroscience
  • Rehabilitation Medicine
  • Clinical Measurement

Background:

  • The visual vertical (VV) assesses perception of earth's verticality through rod adjustments.
  • Clinical use of VV measurement in stroke rehabilitation is widespread.
  • The optimal number of trials for reliable VV assessment remains unaddressed.

Purpose of the Study:

  • To determine the minimum number of trials for reliable visual vertical (VV) assessment in stroke patients.
  • To establish trial consistency for patients with and without VV biases post-stroke.

Main Methods:

  • Assessed VV perception over 10 trials in 117 first-time hemisphere stroke patients.
  • Calculated intraclass correlation coefficient (ICC) and standard error of measurement (SEM).
  • Analyzed data for patient groups with contralesional VV bias, ipsilesional VV bias, and normal VV.

Main Results:

  • Six trials achieved high reliability for patients with VV biases (ICC > 0.89, SEM < 1.36°).
  • Ten trials were required for reliable VV measurement in patients with normal VV (ICC = 0.728, SEM = 1.13°).
  • Six trials correctly classified 96% of patients regarding VV biases.

Conclusions:

  • Ten trials are necessary for adequate VV orientation measurement in unselected subacute stroke patients.
  • Six trials are sufficient for identifying VV biases in complex protocols requiring fewer trials.
  • Findings inform optimal VV assessment protocols in stroke rehabilitation.