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Vocal learning is the ability to modify acoustic and syntactic sounds, acquire new sounds via imitation, and produce vocalizations. "Vocalizations" in this case refers only to sounds generated by the vocal organ (mammalian larynx or avian syrinx) as opposed to by the lips, teeth, and tongue, which require substantially less motor control. [1]
Infants produce a variety of vowel- and consonant-like sounds that they combine into increasingly longer sequences. The production of vowel sounds (already in the first 2 months) precedes the production of consonants , with the first back consonants (e.g., [g], [k]) being produced around 2–3 months, and front consonants (e.g., [m], [n], [p ...
(Other sound production mechanisms produced from the same general area of the body involve the production of unvoiced consonants, clicks, whistling and whispering.) Generally speaking, the mechanism for generating the human voice can be subdivided into three parts; the lungs, the vocal folds within the larynx (voice box), and the articulators.
Describing vocal sound is an inexact science largely because the human voice is a self-contained instrument. Since the vocal instrument is internal, the singer's ability to monitor the sound produced is complicated by the vibrations carried to the ear through the Eustachean (auditory) tube and the bony structures of the head and neck.
The speaker uses a vocal tract (containing most of the speech organs) to produce speech sounds, and the hearer employs an auditory apparatus (the sense of hearing) to receive and process the speech sounds. This is why human language is said to be based on speech sounds produced by the articulatory system and received through the auditory system.
According to the source–filter theory, the resulting sound excites the resonance chamber that is the vocal tract to produce the individual speech sounds. The vocal folds will not oscillate if they are not sufficiently close to one another, are not under sufficient tension or under too much tension, or if the pressure drop across the larynx is ...