Note 8 — Chapter I

The old French case (quoted by Macnish) of a woman, with a portion of her skull removed, whose brain bulged out during dreams but was motionless in dreamless sleep, as well as the more recent similar case known to Hammond (Treatise on Insanity, p. 233), supports the belief that the psychic activity which is not manifested in rememberable dreams is probably at the most of a very shadowy character. Even during waking life psychic activity often falls to a very low ebb; Beaunis, who has investigated this question ('Comment Fonctionne mon Cerveau,' Revue Philosophique, January 1909), describes a condition which he names 'psychic twilight' and regards as frequently occurring.