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voice change
A voice change or voice mutation, sometimes referred to as a voice break, commonly refers to the deepening of the voice of people as they reach puberty. Before puberty, boys and girls have roughly similar vocal pitch, but during puberty the male voice typically deepens, while the female voice usually only deepens by a few notes.〔(【引用サイトリンク】title=Your child's changing voice )〕〔(【引用サイトリンク】title=Voice changing )〕
A similar effect is a voice crack during which a person's voice suddenly and unintentionally enters a higher register (usually falsetto) for a brief period of time. This may be caused by singing or talking at a pitch outside the person's natural vocal range, stress, emotional tension, or the physical changes associated with puberty. An instance of a voice crack (when associated with puberty) lasts for only a moment and generally occurs less frequently as a person grows into maturity.〔(【引用サイトリンク】title=When will my sons voice change? )〕
== Anatomical changes ==
Most of the voice change begins around puberty.〔 Adult pitch is reached 2–3 years later but the voice does not stabilize until the early years of adulthood. It usually happens months or years before the development of significant facial hair. Under the influence of androgens, the voice box, or larynx, grows in both sexes. This growth is far more prominent in boys than in girls and is more easily perceived. It causes the voice to drop and deepen. Along with the larynx, the vocal folds (vocal cords) grow significantly longer and thicker.
The facial bones begin to grow as well. Cavities in the sinuses, the nose, and the back of the throat grow bigger, thus creating more space within the head to allow the voice to resonate.〔 Occasionally, voice change is accompanied by unsteadiness of vocalization in the early stages of untrained voices. Due to the significant drop in pitch to the vocal range, people may unintentionally speak in head voice or even strain their voices using pitches which were previously chest voice, the lowest part of the modal voice register.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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