Which type of speech sound is mainly produced by a complete closure in the vocal tract?

The type of speech sound produced by a complete closure in the vocal tract is known as a plosive, often referred to as a stop. This occurs when airflow is entirely blocked at some point in the vocal tract, creating a buildup of pressure. When the closure is released, it results in a burst of sound. Common examples of plosives in English include sounds like /p/, /b/, /t/, /d/, /k/, and /g/.

The fundamental characteristic of plosives is that they are produced with this complete closure, which distinguishes them from other types of speech sounds. For instance, fricatives involve a narrowing of the vocal tract but do not create total blockage, allowing air to flow continuously, producing a turbulent sound. Nasal sounds are produced with the velopharyngeal port open, allowing air to escape through the nasal cavity while the oral cavity is closed. Approximants involve a constriction that doesn't create turbulence, allowing for smoother airflow and sound production.

Thus, the definition and mechanics of plosives align precisely with the question regarding complete closure in the vocal tract, confirming why this choice is the correct answer.