To be honest, I have not really screamed loudly since the surgery, I figured I will give it at least the 12 months of full healing time before I dare this. However, I can say that involuntary sounds definitely have changed for me. If someone surprises meand I go "eek", its feminine. When it comes to sounds like crying or laughing, a lot has changed, too. The voice change is not as dramatic so that I would sound like a child. There are limits to this surgery, you don't get a soprano voice if you had a bass before - so for me I have an alto voice, which means my screams and sounds are more like that of many adult women. That said - I think going higher in pitch while screaming is more a matter of muscle tension and thus does not depend on voice surgery. I could in some situations scream very high pitched even before the surgery, but again, this would not sound like a child screaming but like an adult woman screaming. To get a child's voice, I guess one would have to do more than vocal fold shortening, if its possible at all. After all body and throat/mouth/nasal cavity size - overall resonance chamber size - matters as well in the way the voice sounds.
