Recently I had a vocal examination via laryngoscope. During the exam, I managed to get a bit of voice feminization technique on camera. As far as I know, this is the first published footage of voice feminization via laryngoscope. There is a lot more footage to collect and hopefully someday I won't be pressed for time so I can exhaustively test things with a camera inside me but this is good for now!
There are a few key things to look for:
1. The velum and how it opens/closes airflow to the nose
2. The tongue root elevation and retraction
3. The curving of the epiglottis and actually resting it on the back of the retracted tongue
4. The elevation of the entire larynx
Voice feminization is all about space reduction of the throat and rear oral cavity. We call this space "R1" and it is responsible for the frequency of Resonance 1. We shrink all the space back there which causes R1 to climb higher, which causes the voice the feminize as the key difference between male and female vocal tracts is the negative space.
Special thanks to Dr. James Thomas for cooperating with my off the cuff requests!
warmly, z