The science behind that low, rattling sound known as vocal fry
It has sparked countless panicky trend pieces and social debates, but vocal fry is more than just a linguistic quirk. Understanding this low-frequency register requires looking deep into the mechanics of your larynx and the way air pulses through your vocal folds.
To understand vocal fry, one must first understand the standard mechanics of human speech. When we speak, we relax the diaphragm to push air from the lungs up through the larynx. This air passes through the glottis, the slit between the vocal folds. By moving these two strips of membranous tissue together, we cause them to vibrate, much like the reed in a saxophone, creating the fundamental sound of our voice.
Human speech typically operates within three primary registers: falsetto, modal, and fry. The falsetto register is the highest frequency, achieved by pulling the vocal folds tight so only their edges vibrate. The modal register is the standard range used for most normal conversation. Vocal fry, often called 'creaky voice,' represents the lowest possible register.
The mechanism of fry is distinct because the vocal folds are pressed together but not stretched longitudinally. This creates a loosely closed gap in the glottis. As breath bubbles out, it creates distinct pulses as the slackened folds rattle against one another. This effect is similar to the chaotic rattling of a guitar string tuned to an extremely low pitch.
While vocal fry is frequently a subject of cultural debate and criticism, it is a widespread phenomenon. Research indicates that it is a common feature of human speech across various demographics, though it is most frequently utilized at the very end of sentences or phrases.
Source: How Does Vocal Fry Work?
