The Atomic Brain (or Monstrosity) is a 1964 horror movie. You can watch it online from Internet Archive:
1000 Misspent Hours calls it "a whacked-out, sleazed-up variation on the venerable mad doctor theme". BadMovies.org is packed with interesting tidbits of information including some still shots. Weird Wild Realm says, "If you're the sort to enjoy truly bad sci-fi, this one will prove truly bad enough & enjoyable."
2/21/2010: SFSignal features this in the Sunday Cinema post today.