The main researchers of the Bélmez case were and . Both collaborated in Bélmez and Freiburg in the early 1970s when the ostensible phenomenon began. However, neither Bender nor de Argumosa published an official report on them. Inexplicably, Bender wrote very little about the case in his journal Zeitschrift für Parapsychologie. Argumosa, a Spanish parapsychologist spent two years evaluating what he believed was a Gothic mystery, but published nothing on the subject either. However, Bender did mention the case in passing and referred to it in some of his lectures. His crucial statement referred to the sealing of areas of the floor where some faces were in progress with a transparent plastic material:
Various faces have appeared and disappeared at irregular intervals since 1971 and have been frequently photographed by the local newspapers and curious visitors. Many Bélmez residents believe that the faces were not made by human hand. Some investigators to believe that it is a unconsciously produced by the owner of the house, María Gómez Cámara. ("Thoughtography" is considered a form of among parapsychologists.)
Manuel Martín Serrano, a sociologist at the , wrote a laborious study, Sociología del Milagro (Sociology of the miracle): the first book that a skeptic has written about this case exclusively. Throughout his book Serrano interviews dozens of Bélmez inhabitants but he never mentions anyone by name. However, Serrano's study is a contribution to explain the social dynamics of what he believes was a hoax perpetrated for financial gain.
Despite the fact that ICV is a respectable institution that belongs to Spain's , in 1992 Pilón published the above chart in the popular Spanish magazine .
The only believer who has published an entire book on the case is José Martínez-Romero. His book Las Caras de Bélmez is a collection of anecdotes. Martínez-Romero is not worried about falsifying the paranormal hypothesis. (An advantage of this and other cases of ostensible thoughtographic appearances is that, as the paranormal interpretation is , it is not a pseudo-scientific hypothesis.) Argumosa himself, who used to be the main defender of this case in Spain, believes that Martínez-Romero discredited the phenomenon with his book.