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In testing for resonance effects without the aid of technology, speech pathologists are asked to rate the speech by listening to a recorded sentence or paragraph, though there is much variability in such subjective ratings, for at least two reasons. First, the acoustic effect of a given velopharyngeal opening varies greatly depending on the degree of occlusion of the nasal passageways. (This is the reason why a stuffy nose from an allergy or cold will sound more nasal than when the nose is clear.) Secondly, for many persons with hypernasal speech, especially hearing impaired, there are also mispronunciations of the articulation of the vowels. It is extremely difficult to separate the acoustic effects of hypernasality from the acoustic effects of mispronounced vowels (examples). Of course, in speech training of the hearing impaired, there is little possibility of making nasality judgments aurally, and holding a finger to the side of the nose, to feel voice frequency vibration, is sometimes recommended. Treatment
Speech therapy
In cases of muscle weakness or cleft palate, special exercises can help to strengthen the soft palate muscles with the ultimate aim of decreasing airflow through the nose and thereby increasing intelligibility. Intelligibility requires the ability to close the nasal cavity, as all English sounds, except the nasal sounds "m" [m], "n" [n], and "ng" [ŋ], have airflow only through the mouth. Normally, by age three, a child can raise the muscles of the soft palate to close to nasal cavity.