Some of us are devoid of all mental imagery, not just visual, but in all sensory modes. It's awfully quiet in my mind! I've never heard a peep, not the sound of a voice --my own or anyone else's --, no music, nada. No ear-worms possible. I can't imagine Boris Karloff doing anything, because I can't imagine Boris Karloff! I can't hear what Ronald Reagan, or anyone else, sounds like. Auditory imagery sounds like a mighty fine superpower that I would like to have!