In particular, his interpretation of the role of altered states in "signal transmission" was represented in Charles Honorton's noise-reduction model of psi facilitation, which, in turn, served as a rationale for Ganzfeld methodology.
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Parapsychologists such as Rhea White say that although Warcollier's studies have been superseded by remote-viewing and Ganzfeld paradigms, his attention to the cognitive processes of reproducing targets, with details of introspectionist data in his reports, stood him apart from much of the American research into extrasensory perception.
Terence Hines (2003) has written the ganzfeld studies cannot be said to provide evidence for psi as the alleged evidence disappears as the tightness of experimental controls is increased.
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Julie Milton and Richard Wiseman (1999) published a critique of Bem and Honorton and a review of new ganzfeld studies.
Estrada has expanded to working behind the camera as well and was an associate producer on the latest film by Michael Oblowitz, "The Ganzfeld Experiment".
Marks is equally skeptical about paranormal claims such as the ganzfeld, psychic staring and psychic pets as described by Rupert Sheldrake, and Uri Geller's performances.