“Every humming fly, every shadow, every sound, the memory of old stories will draw him off his task to other imaginations. Even his own imagination entertains him with a thousand minor subjects. (Melchior Adam Weikard, 1775) This passage, found in a German medical textbook from 1775, describes the psychiatric disorder that back then was called Attentio Volubilis. As far as I’m aware, it’s the earliest”