Note 18 — Chapter II
Reading edition
B. Leroy, 'Nature des Hallucinations,' Revue Philosophique, June 1907. As regards the importance of the absence of voluntary attention in the production of visual images, it may be remarked that even the after-image of a bright object in waking life is much more vivid when it occurs in a state of inattention and distraction. I noticed this phenomenon some years ago, especially when studying mescal, and in recent years it has been recorded by J. H. Hyslop (Psychological Review, May 1903).