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Related Experiment Video

Updated: Jun 4, 2025

A Vibrotactile Feedback Device for Seated Balance Assessment and Training

A Vibrotactile Feedback Device for Seated Balance Assessment and Training

Published on: January 20, 2019

Development and validation of a two-dimensional pseudorandom balance perturbation test.

Andrew R Wagner^1,2, Sophia G Chirumbole³, Jaclyn B Caccese⁴

¹Department of Physical Therapy, School of Pharmacy and Health Professions, Creighton University, Omaha, NE, United States.

Frontiers in Human Neuroscience

|December 23, 2024

Summary

This study introduces a new two-dimensional (2D) balance perturbation test using sum of sinusoids (SoS) signals. The test effectively measures reactive postural control in both anterior-posterior (AP) and medial-lateral (ML) directions simultaneously.

Keywords:

balance multidimensional perturbation postural control vestibular

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Last Updated: Jun 4, 2025

A Vibrotactile Feedback Device for Seated Balance Assessment and Training

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Published on: January 20, 2019

Quantitative Static and Dynamic Assessment of Balance Control in Stroke Patients

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A Modified Lean and Release Technique to Emphasize Response Inhibition and Action Selection in Reactive Balance

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Published on: March 19, 2020

Area of Science:

Biomechanics
Human Motor Control
Neuroscience

Background:

Pseudorandom balance perturbations are used to assess reactive postural control.
Quantifying responses to multidirectional balance perturbations in two dimensions (AP and ML) remains under-investigated.

Purpose of the Study:

To develop and validate a novel two-dimensional (2D) balance perturbation paradigm.
To investigate the ability to quantify postural responses to continuous, multidirectional perturbations.

Main Methods:

Developed a 2D balance perturbation using two spectrally independent sum of sinusoids (SoS) signals for orthogonal tilt dimensions (roll and pitch).
Measured postural sway in 10 healthy adults during 2D perturbations and individual 1D components.

Main Results:

2D perturbations elicited larger sway response spectral peaks at perturbed frequencies compared to non-perturbed frequencies or orthogonal signals.
Sway response magnitude and timing during 1D and 2D conditions were similar for each respective SoS signal.

Conclusions:

The novel 2D SoS perturbation test successfully evoked specific and comparable AP and ML postural responses.
This method provides a validated approach for assessing reactive postural control in multiple dimensions.