A variety of scientific studies on remote viewing have been conducted. Early experiments produced positive results, but they had invalidating flaws. This lack of successful experiments has led the mainstream scientific community to reject remote viewing, based upon the absence of an evidence base, the lack of a theory which would explain remote viewing, and the lack of experimental techniques which can provide reliably positive results. Science writers
Gary Bennett,
Martin Gardner,
Michael Shermer and professor of neurology
Terence Hines describe the topic of remote viewing as
pseudoscience.
C. E. M. Hansel, who evaluated the remote viewing experiments of parapsychologists such as Puthoff, Targ, John B. Bisha, and Brenda J. Dunne, noted that there was a lack of controls, and precautions were not taken to rule out the possibility of fraud. He concluded the experimental design was inadequately reported and "too loosely controlled to serve any useful function." The psychologist
Ray Hyman says that, even if the results from remote viewing experiments were reproduced under specified conditions, they would still not be a conclusive demonstration of the existence of psychic functioning. He blames this on the reliance on a negative outcome—the claims on ESP are based on the results of experiments not being explained by normal means. He says that the experiments lack a positive theory that guides as to what to control on them and what to ignore, and that "Parapsychologists have not come close to (having a positive theory) as yet". Hyman also says that the amount and quality of the experiments on RV are far too low to convince the scientific community to "abandon its fundamental ideas about causality, time, and other principles" due to its findings still not being replicated successfully under scrutiny.
Martin Gardner has written that the founding researcher Harold Puthoff was an active Scientologist before his work at Stanford University, which influenced his research at SRI. In 1970, the
Church of Scientology published a
notarized letter that Puthoff had written while he was conducting research on remote viewing at Stanford. The letter read, in part: "Although critics viewing the system
Scientology from the outside may form the impression that Scientology is just another of many quasi-educational quasi-religious 'schemes,' it is in fact a highly sophistical and highly technological system more characteristic of modern corporate planning and applied technology". Various
skeptic organizations have conducted experiments for remote viewing and other alleged paranormal abilities, with no positive results under properly controlled conditions. According to
Terence Hines:
Thomas Gilovich has written: According to Marks, when the cues were eliminated the results fell to a chance level. In 1980,
Charles Tart claimed that a rejudging of the transcripts from one of Targ and Puthoff's experiments revealed an above-chance result. Targ and Puthoff again refused to provide copies of the transcripts and it was not until July 1985 that they were made available for study when it was discovered they still contained
sensory cues. The information from the
Stargate Project remote viewing sessions was vague and included irrelevant and erroneous data. The project was never useful in any intelligence operation, and it was suspected that the project managers, in some cases, changed the reports so they would fit background cues. Marks in his book
The Psychology of the Psychic (2000) discussed the flaws in the Stargate Project in detail. He wrote that the experiments had several flaws. The possibility of cues or
sensory leakage was not ruled out, the experiments were not independently
replicated, and some of the experiments were conducted in secret, making
peer review impossible. He further noted that the judge,
Edwin May, was also the
principal investigator for the project, risking a significant conflict of interest. Marks concluded the project was nothing more than a "subjective delusion", and after two decades of research, it had failed to provide any scientific evidence for remote viewing. Professor
Richard Wiseman, a psychologist at the
University of Hertfordshire, and a fellow of the
Committee for Skeptical Inquiry (CSI) has pointed out several problems with one of the early experiments at SAIC, including information leakage. However, he indicated the importance of its process-oriented approach and of its refining of remote viewing methodology, which meant that researchers replicating their work could avoid these problems. Wiseman later insisted there were multiple opportunities for participants in that experiment to be influenced by cues and that these cues can affect the results when they appear. ==Selected study participants==