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How are vowels formed without a major blockage in the vocal tract?
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speech
Speech is the faculty of producing articulated sounds, which, when blended together, form language.
Vowels are produced by allowing air from the lungs to pass through the vocal tract with minimal obstruction and without audible friction. Unlike consonants, which often involve a blockage or narrowing of the vocal tract to create noise, a vowel is characterized by the shape of the entire tract between the larynx and the lips, which functions as a resonance chamber.12
While the vocal cords are usually vibrating to produce voice, the specific quality of a vowel is determined by the configuration of the vocal tract. This is achieved through:31
- Tongue Position: Vowels are classified by the height of the tongue (high, mid, or low) and its front-to-back position within the mouth.1
- Lip Shape: The lips may be rounded or spread, a feature known as labialization.1
- Pharyngeal Adjustment: The position of the tongue root can expand or narrow the pharynx, further modifying the resonance.1
Because there is no major constriction, the air flows relatively freely, allowing the vocal tract to shape the sound through these varying configurations.32