Page "Babbling" Paragraph 4
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The sounds and expressions of babbling are produced before an infant begins to construct recognizable words.
When reaching an age of 6 months, infants are finally able to control the opening and closing of the vocal tract, and upon obtaining this ability, infants begin to distinguish between the different sounds of vowels and consonants.
During the canonical stage, the babbling involves reduplicated sounds containing alternations of vowels and consonants ( i. e. ; baba or bobo ).
By the time an infant reaches 8 – 9 months, they display productions of more advanced sounds known as variegated babbling.
This stage includes more complex combinations of consonant and vowel syllables ( i. e. ; babadoobe ).
The final stage is known as conversational babbling, or the " jargon stage " ( usually occurring by about ten months of age ).
The jargon stage is defined as " pre-linguistic vocalizations in which infants use adult-like stress and intonation ". The general structure of the syllables that they are producing is very closely related to the sounds of their native language and this form of babbling significantly predicts the form of early words.
Infants continue to use intonation patterns and timing that matches the characteristics of their language.
Most babbling consists of a small number of sounds, which suggests the child is preparing the basic sounds necessary to speak the language to which he is exposed.
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