My husband, son and I are all right handed. Yesterday we tried and saw that we could all read pretty quickly upside down, didn't check backwards, or mirror reading. I'm pretty sure that backward writing would be very slow for me.
I did some research on line after I read what Lurker and Momof7 apparently this is really common for lefties. I don't know how I got to be this old without knowing that.
Debzhaus, I've always been a rapid reader. I'm not much of an intellectual thoght so I probably won't be reading subtitles at an opera or foreign movie though