A near-death experience (NDE) is an experience reported by a person who nearly died, or who experienced clinical death and then revived. NDEs include one or more of the following experiences: a sense of being dead; an out-of-body experience; a sensation of floating above one's body and seeing the surrounding area; a sense of overwhelming love and peace; a sensation of moving upwards through a tunnel or narrow passageway; meeting deceased relatives or spiritual figures; encountering a being of light, or a light; experiencing a life review; reaching a border or boundary; and a feeling of being returned to the body, often accompanied by reluctance. Interest in the NDE was originally spurred by the research of psychiatrists Elisabeth Kübler-Ross, George Ritchie, and Raymond Moody Jr. In 1998, Moody was appointed chair in "consciousness studies" at the University of Nevada, Las Vegas. The International Association for Near-death Studies (IANDS) was founded in 1978 to meet the needs of early researchers and experiencers within this field of research. Later researchers, such as psychiatrist Bruce Greyson, psychologist Kenneth Ring, and cardiologist Michael Sabom, introduced the study of near-death experiences to the academic setting.
Some researchers, including Dr. Rick Strassman, believe that near death experiences may be related to the chemical DMT's (Dimethyltryptamine) release from the pineal gland. The chemical is released naturally during sleep, is thought to have an effect on dream content, and is used as a recreational drug. Strassman sees the chemical as a mediator for hyperdimensional experiences, and points out that experiences with the drug are comparable to NDE's.
Anomalous Psychology
A number of studies conducted in the American, European, and Australasian continents have found that a majority of people surveyed report having had experiences that could be interpreted as telepathy, precognition, and similar phenomena. Variables that have been associated with reports of psi-phenomena include belief in the reality of psi; the tendency to have hypnotic, dissociative, and other alterations of consciousness; and, less reliably so, neuroticism, extraversion, and openness to experience. Although psi-related experiences can occur in the context of such psychopathologies as schizotypal personality, dissociative, and other disorders, most individuals who endorse a belief in psi are well-adjusted, lack serious pathology, and are not intellectually deficient or lacking critical abilities.
Criticism
Scientists who are critical of parapsychology begin with the assertion that extraordinary claims demand extraordinary evidence. Proponents of hypotheses that contradict centuries of scientific research must provide extraordinary evidence if their hypotheses are to be taken seriously. Many analysts of parapsychology hold that the entire body of evidence to date is of poor quality and not adequately controlled. In their view, the entire field of parapsychology has produced no conclusive results whatsoever. They cite instances of fraud, flawed studies, a psychological need for mysticism, and cognitive biases (such as clustering illusion, availability error, confirmation bias, illusion of control, and the bias blind spot) as ways to explain parapsychological results. Skeptics have also contended that people's desire to believe in paranormal phenomena causes them to discount strong evidence that it does not exist.
The reality of parapsychological phenomena and the scientific validity of parapsychological research is disputed by independent evaluators and researchers. In 1988, the U.S. National Academy of Sciences gave a report on the subject that concluded that "no scientific justification from research conducted over a period of 130 years for the existence of parapsychological phenomena." In the same report, however, they also recommended monitoring some parapsychological research, such as psychokinesis on random number generators and Ganzfeld effects, for possible future studies. The studies at the PEAR lab, recommended for monitoring by the report, have since concluded. These studies likewise failed to elicit a positive response by the scientific community despite numerous trials. A 2008 study using fMRI showed no detectable psi effect.
Additionally, the methods of parapsychologists are regarded by some critics, including those who wrote the science standards for the California State Board of Education, to be pseudoscientific. Some of the more specific criticisms state that parapsychology does not have a clearly defined subject matter, an easily repeatable experiment that can demonstrate a psi effect on demand, nor an underlying theory to explain the paranormal transfer of information. James E. Alcock, Professor of Psychology at York University, said that few of parapsychology's experimental results have prompted interdisciplinary research with more mainstream sciences such as physics or biology. Alcock states that parapsychology remains an isolated science to such an extent that its very legitimacy is questionable, and as a whole is not justified in being labeled "scientific".
Fraud
There have been instances of fraud in the history of parapsychology research. The Soal-Goldney experiments of 1941–43 (suggesting precognitive ability in subjects) were long regarded as some of the best in the field because they relied upon independent checking and witnesses to prevent fraud. However, many years later, suspicions of fraud were confirmed when statistical evidence, uncovered and published by other parapsychologists in the field, indicated that Dr. Soal had cheated by altering the raw data.
Walter J. Levy, director of the Institute for Parapsychology, reported on a series of successful ESP experiments involving computer-controlled manipulation of non-human subjects, including eggs and rats. His experiments showed very high positive results. Because the subjects were non-human, and because the experimental environment was mostly automated, his successful experiments avoided criticism concerning experimenter effects, and removed the question of the subject's belief as an influence on the outcome. However, Levy's fellow researchers became suspicious about his methods. They found that Levy interfered with data-recording equipment, manually creating fraudulent strings of positive results. Rhine fired Levy and reported the fraud in a number of articles.
Many spiritualist mediums used fraud, and some were exposed by early psychical researchers such as Richard Hodgson and Harry Price. In the 1920s, magician and escapologist Harry Houdini said that researchers and observers had not created experimental procedures which absolutely preclude fraud. In 1979, magician and debunker James Randi perpetrated a hoax, now referred to as Project Alpha. Randi recruited two young magicians and sent them under cover to Washington University's McDonnell Laboratory with the specific aim of exposing poor experimental methods and the credulity thought to be common in parapsychology. Although no formal statements or publications from the McDonnell laboratory supported the likelihood that the effects demonstrated by the two magicians were genuine, both of Randi's recruits repeatedly tried but failed to deceive experimenters over a period of four years with demonstrations of supposedly telekinetic metal bending. Such methodological failures have been cited as evidence that most, if not all, extraordinary results in parapsychology derive from error or fraud.
Criticism of Experimental Results
Although some critical analysts feel that parapsychological study is scientific, they are not satisfied with its experimental results. Skeptical reviewers contend that apparently successful experimental results in psi research are more likely due to sloppy procedures, poorly trained researchers, or methodological flaws than to genuine psi effects. For example, the data from the PEAR laboratory has been criticized by researchers such as statistics professor Jessica Utts and psychologist Ray Hyman. Utts has stated that these experiments suffered numerous problems with regard to randomization, statistical baselines and the application of statistical models, and concluded that the significance values quoted in the experiments were meaningless due to defects in experimental and statistical procedures of the studies.
Because psi is a negatively defined concept, a typical measure of the evidence for such phenomena in parapsychological experiments is statistical deviation from chance expectation. However, critics point out that statistical deviation from chance is, strictly speaking, only evidence of a statistical anomaly, or that some unknown variable was causing the deviation from chance. Hyman contends that even if experiments could be made to reproduce the findings of certain parapsychological studies under specific conditions, this would be a far cry from concluding that psychic functioning has been demonstrated. It has also been stated that assuming psi exists is affirming the consequent or begging the question. Reasoning that (1) if a person is psychic, then that individual will do better than chance in experiments, and (2) since that person does better than chance, then, (3) that person must be psychic, would be considered the fallacy of affirming the consequent.