Final answer:
The presence or absence of nasal emission is an important diagnostic sign of velopharyngeal adequacy. Hypernasality, hyponasality, and velopharyngeal insufficiency are related factors that affect speech resonance and may indicate issues with the velopharyngeal port.
Step-by-step explanation:
The presence or absence of Nasal emission is an important diagnostic sign of velopharyngeal adequacy. Nasal emission refers to the escape of air through the nose during speech or when making certain sounds. This can indicate a problem with the closure of the velopharyngeal port, which can be a sign of velopharyngeal insufficiency.
In contrast, hypernasality refers to excessive nasal resonance during speech, often due to inadequate closure of the velopharyngeal port. It can make speech sound muffled or nasal-like. On the other hand, hyponasality refers to a lack of normal nasal resonance, which can occur when there is a blockage in the nasal passage.