Something I recently became aware of is that in some cases toilet paper orientation preference may be due to left handedness vs right handedness.

I am right handed and prefer to have the paper oriented over itself.

A member of my family is left handed and prefers to have the paper under itself. She once said that for her, with left handedness, having the paper under itself makes it easier to grab.

Wouldn't this completely depend on which side the toilet paper holder is mounted?

That doesn't make sense to me, surely it's always easier (by whatever little amount) if it's away from the wall ('over itself' as you say I think), whichever side it is, and whichever hand you use dominantly?

I don't think handness has anything to do with it. I'm left handed and I prefer the paper oriented over itself.

Me too.

My partner is left handed and prefers the same. (I do, too, but I'm right handed)

I think it depends mostly on whether you enjoy hitting your hand on the wall or not ;-)

I’m team “over” as far as toilet paper goes :), but the best argument I ever heard for TP rolled “under” was that in this configuration your cat couldn’t unspool the entire roll onto the floor.

From personal experience, that assumption is false. One of my parents thought they were clever, and Frostbite speed unrolled it by using the cabinet as a backing. I do miss that monster.

Today, we learn about the toilegami.

Whoa! I just learned a good reason for the under position! (Thanks.)

This makes me hate Wikipedia deletionists all the more.

Related: what do you do if the paper has 3 layers, and you are holding 2 layers of one turn and 1 layer from the next/previous turn, and the holder has a cover so you can't access the roll directly?