Electroglottograph

Electroglottograph

The Electroglottograph (EGG) is a device used in speech research and voice analysis to measure and record the movements of the vocal folds during speech production. It provides valuable insights into the functioning of the larynx and helps in understanding various aspects of voice production.

History

The concept of using electrical signals to measure vocal fold movements was first introduced in the 1950s. However, it was not until the 1970s that the Electroglottograph, as we know it today, was developed. The device gained popularity in the field of speech research due to its non-invasive nature and ability to provide detailed information about vocal fold vibrations.

Functioning

The Electroglottograph consists of two electrodes that are placed on either side of the larynx. These electrodes detect the changes in electrical conductivity that occur when the vocal folds come into contact with each other during phonation. The device measures the contact quotient, which is the proportion of the glottal cycle during which the vocal folds are in contact.

Applications

The Electroglottograph has found numerous applications in the field of speech research and voice analysis. Some of its key uses include:

1. Voice Disorders: The EGG is used to assess and diagnose various voice disorders, such as vocal fold nodules, polyps, and paralysis. It provides valuable information about the vibratory patterns of the vocal folds, helping in the evaluation and treatment of these conditions.

2. Phonetics Research: The EGG is widely used in phonetics research to study the coordination and timing of vocal fold movements during speech production. It helps in understanding the mechanisms involved in producing different speech sounds and the variations across different languages.

3. Voice Training: The EGG is also used in voice training and therapy to monitor and improve vocal fold coordination. It provides visual feedback to the individual, helping them develop better control over their voice and improve their overall vocal quality.

Limitations

While the Electroglottograph is a valuable tool in speech research and voice analysis, it does have some limitations. These include:

1. Invasiveness: Although the EGG is considered non-invasive, it still requires the placement of electrodes on the neck, which can be uncomfortable for some individuals.

2. Limited Information: The EGG provides information about the contact quotient and vocal fold vibrations but does not provide direct information about other aspects of voice production, such as vocal fold tension or subglottal pressure.

3. Interpretation Challenges: Interpreting the data obtained from the EGG requires expertise and knowledge in the field of speech research. It can be challenging to accurately analyze and interpret the recorded signals.

Conclusion

The Electroglottograph is a valuable tool in speech research and voice analysis, providing insights into the functioning of the larynx and vocal fold movements. It has numerous applications in diagnosing voice disorders, studying phonetics, and improving voice training techniques. Despite its limitations, the EGG continues to be an essential device in the field of speech and voice research.

See Also

• Larynx
• Voice Analysis
• Speech Research