Just to add to John Buckner, above, a high wing plane without dihedral will fly like it has some, i.e., give it rudder and it will bank as well as yaw. That's because in a skid, pressure increases under the wing at the fuse junction and tends to lift. In a slip, it is the opposite...pressure increases next to the fuse under the inboard wing.

Most high wing planes also have some dihedral, which makes them pretty stable, meaning they resist rolling a little and if rolled, they tend to self-correct. So if you take away the self-correcting tendency, they will roll faster.

So John's unusual airplanes above counter this tendency with anhedral. Good idea! Looks kind of weird, but I can see the sound thinking behind it.

With low wing planes it is the opposite. Some people take all the dihedral out low wing planes, but if you do that you have an airplane that prefers to be upside down! That's why designers always use some dihedral on low wing airplanes. The purpose is to achieve something like neutral stability. Neutral stability in this case meaning that a rudder input does not cause roll either way.

Note that a high wing with anhedral and a low wing with dihedral are sort of mirror images of each other. Both of them, if the angles are right, can be neutrally stable.

Jim