My friend could do it just as easily with her mouth open & I wouldn't describe it as a flip. Flipping is another skill. Can you lay the tip of your tongue on your tongue at the the back of your mouth, almost down to your throat? I can do it with about the first half inch of my tongue, which is not what I'm talking about. There was no part of the top of my friend's tongue visible when she did it. I looked for pictures, but couldn't find any. Instead, I found out some people can also make a "U" or "cloverleaf" curl.
I inherited a tongue thrust, which means I swallow "wrong" & have a lisp. Speech recognition software has pushed me to work on my lisp again, because some programs can't understand me when I say yes. My mom & I both had years of speech therapy in school. My granny never did & her lisp was always quite noticeable.
Renfield, how bout you & the rest of your family? You know y'all can do it, cuz you opened your mouths & showed each other, right? When you say everyone, are you including both of your parents?
Mirror writing is associated with being truly ambidextrous. The wiring in your brain has some of your activities being mirrored in your brain hemispheres. I believe you have a rehab advantage if you ever suffer a brain injury, such as a stroke. In the not too distant past, left handed children were forced to favor their right hands, so they seemed to be ambidextrous, though their brains weren't wired for it. They should be able to write equally well with either hand, but they won't be able to do the mirror writing.
At most family gatherings, the left handed member gets put at the end of the table, so they don't bump elbows with a right handed person sitting next to them. Use of a knife is where the elbow bumping happens enough to matter. My family was the opposite. As the only righty, I was the one put on the end. I had to learn how to use a lefty scissors, cuz that's all we had in the house. My granny was one of those forced to be ambidextrous. My ma writes with her paper up side down, which is something more often associated with lefties.
We start with a topic about shoes & here we are with odd face tricks. lol Winking (I can with one eye, but not both), raising a single eyebrow (I can't), wiggling ears (nother thing I can't do).
Here's one for you..
I can consciously raise the temperature of my hands.. ( increase bloodflow )
It requires some concentration on my part, and a couple of minutes, but I can make them "feverish"..
Once sat quietly in a room with 2 cats, and "purred" with them.. ( I have never been able to duplicate this feat, and have always wanted to be able to do it "at will".. )
"I believe you have a rehab advantage if you ever suffer a brain injury, such as a stroke."
Oddly enough, when I was 20, I suffered a massive head trauma and was comatose for 11 days.
My entire frontal lobe was basically pulverized by the concussive ricochetting of my brain against the sharp ridges of bone inside the front of the skull.
[where there was once an empty "hole" is now just scar tissue]
The right temporal lobe was also a battered mess and the back of my brain where the crack in my skull was widest was terribly swollen and damaged from bruising.
They told my parents that *if* I even lived at all, I'd be a vegetable for the rest of my life.
On the 11th day I sat up and asked for a cheeseburger and left the hospital that day.
I have only a balance problem, anosmia and short-term memory deficits to show for all of that so I reckon you're right....:)
I never had "rehab" of any kind, whatsoever.
Just to be contrary, I instead seemed to be better able to learn new and previously incomprehensible things than before.
I taught myself Greek to read the Greek NT, for instance.
I became interested in quantum physics and other such strange things.
[not too shabby for a vegetable, eh?]..;))
The neuro docs were perplexed to the point of actual anger because I continually defied their "prognosis", day after day until it became year after year.
Evidently my brain just "rewired" itself and went on its merry way.
Personally, I think I experienced a "miracle"...:)
Well, I can curl my tongue back, but I can't make it disappear. From your original description I didn't quite understand what you meant.
My late father could wiggle his ears, though. (He waited until I was in college to show me, darn it!). It was quite amusing.