Anarchic hand, also known as Alien Hand Syndrome, is a neurological condition where the hand seems to take on a mind of its own.
I use the term anarchic hand in my critiques for other writers to describe a particular first-person narrative style where the author does something like this:
My hand reached for the phone.
My eyes shifted toward the door.
Instead of just saying: I reached for the phone or I looked toward the door.
I don’t guess there’s really anything wrong with it–we know what the author means–but it’s one of those things that I personally find distracting. In first-person, someone saying “my hand (did something)” sounds like they have no control over it. Ultimately, it’s the writers’ choices on how they want to word their narrative, but I always point this one out just in case they didn’t realize how it sounds to others (or at least me).