In reading Bill Morgan’s The Typewriter is Holy, I’ve been thinking a lot about the writings and happenings in Ginsberg’s and Kerouac’s lives that led to their extreme change in literary style. At http://www.writing.upenn.edu/~afilreis/88/kerouac-spontaneous.html you can see the way Kerouac describes it in his “Essentials of Spontaneous Prose”.