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Related Experiment Video

Updated: Jun 10, 2026

Construction and Characterization of a Novel Vocal Fold Bioreactor

Construction and Characterization of a Novel Vocal Fold Bioreactor

Published on: August 1, 2014

A novel integrated mechanomyogram-vocalization access solution.

Natasha Alves¹, Tiago H Falk, Tom Chau

¹Bloorview Research Institute, Bloorview Kids Rehab, Toronto, ON, Canada.

Medical Engineering & Physics

|July 16, 2010

Summary

This summary is machine-generated.

This study presents a new dual-switch system using forehead-mounted microphone to detect muscle activity (mechanomyography) and humming. This innovative assistive technology provides two independent control signals for enhanced accessibility.

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Area of Science:

Biomedical Engineering
Assistive Technology
Human-Computer Interaction

Background:

Developing effective assistive technologies is crucial for individuals with severe physical disabilities.
Existing single-access solutions often lack the versatility to provide multiple control signals.
Integrating different physiological signals can offer robust and independent control pathways.

Purpose of the Study:

To introduce and evaluate a novel dual-switch control paradigm.
To enable simultaneous measurement of frontalis muscle mechanomyography (MMG) and vocalizations (humming).
To provide two independent binary control signals from a single access site.

Main Methods:

Simultaneous measurement of MMG and vocalizations using a single forehead-mounted contact microphone.
Detection of vocalizations via periodic high-frequency components using normalized cross-correlation.
Detection of muscle contractions using continuous wavelet transform.
Evaluation in a cued activation task with eleven participants.

Main Results:

High sensitivities and specificities achieved for both vocalizations (96.8%±3% and 98.4%±1%) and muscle contractions (99.7%±0.5% and 99.2%±0.5%).
Non-overlapping bandwidths of skin vibrations prevented interference between MMG and vocalization signals.
The dual-switch system demonstrated reliable performance, including for an individual with severe physical disabilities.

Conclusions:

The integrated MMG-vocalization access solution successfully provides two independent binary switches from a single site.
This novel approach can augment access alternatives for individuals with severe physical disabilities.
The system's robustness and independence of the two control signals highlight its potential impact in assistive technology.