Parapsychology (from the Greek: παρά para, "alongside" + psychology) is the study of paranormal psychological phenomena, such as extra-sensory perception, psychokinesis, and survival of consciousness after death. Parapsychologists call these processes psi, a term non-suggestive of what causes the phenomena or experiences. To date, no evidence has been accepted by the mainstream scientific community as irrefutably supporting paranormal phenomena.

History
The Society for Psychical Research (SPR) was founded in London in 1882. The SPR was the first systematic effort to organize scientists and scholars for a critical and sustained investigation of paranormal phenomena. The early membership of the SPR included philosophers, scholars, scientists, educators and politicians, such as Henry Sidgwick, Arthur Balfour, William Crookes, and Charles Richet.

Early psychical research
In 1911, Stanford University became the first academic institution in the United States to study extra-sensory perception (ESP) and psychokinesis (PK) in a laboratory setting. The effort was headed by psychologist John Edgar Coover. In 1930, Duke University became the second major U.S. academic institution to engage in the critical study of ESP and psychokinesis in the laboratory. Under the guidance of psychologist William McDougall, and with the help of others in the department, including psychologists Karl Zener, Joseph B. Rhine and Louisa E. Rhine, laboratory ESP experiments began, using volunteer subjects from the undergraduate student body. As opposed to the approaches of psychical research, which generally sought qualitative evidence for paranormal phenomena, the experiments at Duke University proffered a quantitative, statistical approach using cards and dice. As a consequence of the ESP experiments at Duke, standard laboratory procedures for the testing of ESP developed and came to be adopted by interested researchers throughout the world.

Rhine era
The Parapsychological Association (PA) was created in Durham, North Carolina, on June 19, 1957. Its formation was proposed by J. B. Rhine at a workshop on parapsychology, which was held at the Parapsychology Laboratory of Duke University. Rhine proposed that the group form itself into the nucleus of an international professional society in parapsychology. The aim of the organization, as stated in its Constitution became "to advance parapsychology as a science, to disseminate knowledge of the field, and to integrate the findings with those of other branches of science".

Decade of increased research (1970s)
Contemporary parapsychological research has waned considerably.

Parapsychology today

Research
Parapsychologists study a number of ostensible paranormal phenomena, including but not limited to:
The definitions for the terms above may not reflect their mainstream usage, nor the opinions of all parapsychologists and their critics. Many critics, for example, feel that parapsychologists are engaged in the study of phenomena that disappear under stringent experimental conditions and are thus normal processes.
According to the Parapsychological Association, parapsychologists do not study all paranormal phenomena, nor are they concerned with astrology, UFOs, Bigfoot, paganism, vampires, alchemy, or witchcraft.

Telepathy: Transfer of information on thoughts or feelings between individuals by means other than the five classical senses.
Precognition: Perception of information about future places or events before they occur.
Clairvoyance: Obtaining information about places or events at remote locations, by means unknown to current science.
Psychokinesis: The ability of the mind to influence matter, time, space, or energy by means unknown to current science.
Reincarnation: The rebirth of a soul or other non-physical aspect of human consciousness in a new physical body after death.
Hauntings: Phenomena often attributed to ghosts and encountered in places a deceased individual is thought to have frequented, or in association with the person's former belongings. Scope
Parapsychologists employ a variety of approaches during the study of apparent paranormal phenomena. These methods include qualitative approaches used in traditional psychology, but also quantitative empirical methodologies. Their more controversial studies involve the use of meta-analyses in examining the statistical evidence for psi.

Methodology

Experimental research

Main article: Ganzfeld experiment Ganzfeld

Main article: Remote viewing Remote viewing

Main article: Psychokinesis Psychokinesis on random number generators
This experimental domain was previously called "bio-PK." More recently, researchers refer to it as 'direct mental interactions with living systems' (DMILS). It studies the effects of one person's intentions on a distant person's psychophysiological state. One type of DMILS experiment looks at the commonly reported "feeling of being stared at." The "starer" and the "staree" are isolated in different locations, and the starer is periodically asked to simply gaze at the staree via closed circuit video links. Meanwhile the staree's nervous system activity is automatically and continuously monitored.
Parapsychologists have interpreted the cumulative data on this and similar DMILS experiments to suggest that one person's attention directed towards a remote, isolated person, can significantly activate or calm that person's nervous system. In a meta-analysis of these experiments published in the British Journal of Psychology in 2004, researchers found that overall there was a small, but significant DMILS effect. However, the study also found that when a small number of the highest quality studies from one laboratory were analyzed, the effect size was not significant. The authors concluded that although the existence of some anomaly related to distant intentions cannot be ruled out, there was also a shortage of independent replications and theoretical concepts.

Direct mental influence on living systems

Main article: Near-death experience Near death experiences
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.

Anomalous psychology
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.

Criticism
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. Such methodological failures have been cited as evidence that most, if not all, extraordinary results in parapsychology derive from error or fraud.

Fraud
Although some critical analysts feel that parapsychological study is scientific, they are not satisfied with its experimental results.

Criticism of experimental results
Selective reporting has been offered by critics as an explanation for the positive results reported by parapsychologists. Selective reporting is sometimes referred to as a "file drawer" problem, which arises when only positive study results are made public, while studies with negative or null results are not made public.

Organizations and publications