One can occasionally feel this something haunting the fringe…
Page 180. One can occasionally feel this something haunting the fringe of consciousness. James said, I seriously believe that the general problem of the subliminal promises to be one of the greatest problems, possibly even the greatest problem of psychology. Subliminal is often used interchangeably with unconscious, but it shouldn’t be. It refers, instead, to mental processes just below the threshold of consciousness that can often be felt without fully emerging. Just a hint, a fleeting maybe, that’s all we get, but it is often enough to qualify as something that we know, at least for a moment.
— from The Mind in the Cockpit · Sick Souls, Healthy Minds- How William James Can Save Your Life by John Kaag