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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Isolation — Richard Wiseman and others argue that not all of the studies used soundproof rooms, so it is possible that when videos were playing, the experimenter could have heard it, and later given involuntary cues to the receiver during the selection process.
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Julie Milton and Richard Wiseman (1999) published a critique of Bem and Honorton and a review of new ganzfeld studies.
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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".