 Green and McCreery proposed the term metachoric experience to denote experiences of this kind, in which the subject’s entire field of perception is replaced with a hallucinatory one.This enabled them to relate apparitional experiences to lucid dreams and out-of-body experiences, which they argued also meet this definition.McCreery later collaborated with Green on a book on lucid dreaming, which discussed further the concept of metachoric experience, and added false awakenings to the category.