Parapsychology developed in the 1930s as a branch of psychology. Parapsychologists such as Nandor Fodor took interest in psychedelics as a means of understanding psychic phenomena.
Modern Psychology 6, No. 5, March 1937, Fodor’s scrapbook, Eileen J. Garrett Parapsychology Foundation Collection, Collection 331, Special Collections, University of Maryland, Baltimore County (Baltimore, MD).