The symbol X, typically marked in blue, represents the left ear. The PTA is often used to describe an individual's hearing loss. The loudness level at which a person begins to be aware of speech sounds, without necessarily understanding words. The SDT may reflect the level at which the person is aware of words or sentences, or of individual sounds that represent various parts of the frequency range. Usually described by a percentage score or the terms poor, fair, good, or excellent, this test evaluates a person's ability to understand one- syllable words at a comfortable listening level.
Hearing is better in the low frequencies than in the high frequencies.
Hearing is better in the low and high frequencies than in the middle frequencies. Much of the information in speech that helps differentiate one sound from another is located in the higher frequencies. Vowel sounds have their energy in the lower pitches while many consonant sounds have their energy in the higher pitches. Loss Three types of audiological testing air conduction, bone conduction, and tympanometry can help determine whether a hearing loss is conductive, sensorineural, or mixed. The test evaluates the whole ear system outer, middle, and inner ear.