False cord phonation produces a much deeper, rougher voice quality than normal phonation. It is purposefully used in certain kinds of vocal performance, such as Tibetan chant or heavy metal screaming. It can also occasionally serve as an alternate voice for a person whose true cords are unable to vibrate—due, for example, to their surgical removal or to scarring. It can also be produced concurrently with true cord phonation to produce a “Louis Armstrong” effect.
False cord phonation due to flaccid true cords (1 of 5): before false cords begin to vibrate
An elderly man, quiet by nature who uses the voice little, complains of weak, gravelly voice quality. This view of phonation, standard light, shows a slightly wider dark line of phonatory blurring. Also, the false vocal cords are overly approximated, but not yet participating in vibration (for that, see images 4 and 5).
False cord phonation due to flaccid true cords (2 of 5): before false cords begin to vibrate
Strobe light reveals an unusually wide amplitude of vibration, denoting flaccidity of the true vocal cords.
False cord phonation due to flaccid true cords (3 of 5): before false cords begin to vibrate
Maximum closed phase shows the telltale residual opening at the anterior commissure (from this perspective, the lowermost end of the true cords), also a potent indicator of flaccidity.
False cord phonation due to flaccid true cords (4 of 5): after false cords begin to vibrate
When asked to produce louder voice, the false cords begin to participate in vibration, and a rough, gravelly superimposed “godfather” quality arrives. Notice that the true cords are in at least partial open phase of vibration.
False cord phonation due to flaccid true cords (5 of 5): after false cords begin to vibrate
Now the false cords are in open phase of vibration, and the true cords are in maximum closed phase of vibration, with the same residual opening anteriorly seen in photo 3. False cord phonation is not to be seen most accurately as primary here, but as a secondary result of effort necessitated by flaccid true cords.
Thin and weak voice (1 of 4)
This man has a thin and weak voice, often with a superimposed gravelly, rough quality. In this view, false cords, marked with dotted lines, obscure the true cords and their vibration is indicated by blurred margins.
True cords during closed phase (2 of 4)
At much closer range under strobe light, the true cords are approximated during the closed phase of vibration. The false cords should remain lateralized throughout voice production (but don’t).
Flase cords during open phase (3 of 4)
From same viewing position, but during open phase of vibration, showing very “wide” amplitude of vibration caused by flaccidity. The false cords are beginning to come together.
Bowing (1 of 4)
The true cords are together posteriorly but with major bowing seen at the pre-phonatory instant, to explain the husky, weak quality of voice.
Closed phase (2 of 4)
As a result of the need to compress together the weak true cords, false cords also overcompress. This is closed phase of true cords; false cords have not yet reached midline as they are vibrating more slowly than the true cords.
False cord phonation (3 of 4)
Now the false cords have come into contact but below them the true cords have begun their open phase of vibration. We hear the husky, weak true voice with the superimposed rough, gravelly false cord phonation.
True cords vibrate (1 of 4)
At relatively high pitch, only the true cords vibrate. This is closed phase, under strobe light.
True and false cords, closed phase (3 of 4)
At low pitch, where false cord phonation is facilitated. Both true and false cords are in closed phase of vibration (though the true cords are obscured by the false cords).
Hemilaryngectomy (1 of 4)
After removal of the anterior larynx (hemilaryngectomy) for cancer that recurred after radiation therapy. Though not well seen here, the vocal cords are surgically absent. The black dot seen is for orientation to the next photo. A = arytenoid; E = epiglottis.
Within the larynx (2 of 4)
A view within the larynx. Note again that vocal cords are surgically absent, with only the arytenoid cartilages remaining at the level of the cords. The black dot, on the left arytenoid cartilage, orients to the prior photo. The dot is on the right vocal process.
"Wolfman Jack" voice (3 of 4)
The patient is about to produce his rough, “Wolfman Jack” voice but the arytenoid mounds have not yet started to vibrate.
True cord phonation
False cord phonation
True and false cord phonation