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How does whispering differ from normal voiced speech?

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Diagram of a human head in profile showing the location of vocal organs and possible places of articulation for speech sounds, with labels for lips, teeth, tongue, palate, uvula, pharynx, and vocal cords, and numbered regions corresponding to types of articulation such as bilabial, alveolar, and velar.
phonetics Diagram depicting the location of human vocal organs and possible places of articulation used for speech.

In linguistics, the primary distinction between normal voiced speech and whispering lies in the state of the vocal cords and the resulting presence or absence of voice.12

  • Normal Voiced Speech: The vocal cords are held taut, allowing them to vibrate as air passes through the larynx. This vibration creates the periodic sound waves that define voiced sounds, such as vowels and many consonants.2
  • Whispering: The vocal cords are held rigid, which prevents the vibration necessary for voicing. While voiceless sounds are produced as they would be in normal speech, voiced sounds are instead generated by forcing air through a narrow opening in the glottis—specifically the whisper glottis—formed by holding the vocal cords close together but immobile.13

Essentially, whispering is speech in which voice is entirely excluded, relying on the manipulation of the airstream through the vocal tract without the periodic vibrations that characterize standard vocalization.2