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Noetic experiences include psychic phenomena, known generically as "psi" experiences. Psi denotes anomalous processes of information or energy transfer, processes that are currently unexplained in terms of known physical or biological mechanisms. They are generally labeled extrasensory perception (ESP) -- the acquisition of information without using the known senses -- and psychokinesis (PK), the ability to influence physical objects or events without the intervention of any known physical force. Common labels for the various ways that ESP manifests are telepathy (mind-to-mind), clairvoyance (perceiving events or objects that are hidden, shielded, or at a distance) and precognition (perceiving the future).

In science generally, a phenomenon is not considered a reliable fact until it has been observed repeatedly by numerous independent researchers.  One criticism of parapsychology, the branch of science that studies psi phenomena, is that it has not produced a repeatable psi effect. Another criticism is that psi experiments have inadequate controls and safeguards. In 1974, an experimental procedure was developed that is now known to adequately address both of those criticisms. The "Ganzfeld experiment" provides an independently repeatable demonstration of telepathy under rigorously controlled conditions, and it has been repeatedly discussed in mainstream academic psychology journals. Several other classes of psi experiments have also achieved this level of credibility.

Note: This is an encore presentation.