Psychokinesis (from the Greek ψυχή, "psyche", meaning mind, soul, spirit, heart, or breath; and κίνησις, "kinesis", meaning motion, movement; literally "mind-movement"), also referred to as telekinesis (Greek τῆλε + κίνησις, literally "distant-movement") with respect to strictly describing mental movement or motion of solid matter, abbreviated as PK and TK respectively, is a term coined by publisher Henry Holt to refer to the direct influence of mind on a physical system that cannot be entirely accounted for by the mediation of any known physical energy. Examples of psychokinesis could include distorting or moving an object, and influencing the output of a random number generator.
The study of phenomena said to be psychokinetic is part of parapsychology. Some psychokinesis researchers claim psychokinesis exists and deserves further study, although the focus of research has shifted away from large-scale phenomena to attempts to influence dice and then to random number generators.
Most scientists believe that the existence of psychokinesis has not been convincingly demonstrated. A meta-analysis of 380 studies in 2006 found a "very small" effect which could possibly be explained by publication bias. PK experiments have historically been criticised for lack of proper controls and repeatability. However, some experiments have created illusions of PK where none exists, and these illusions depend to an extent on the subject's prior belief in PK.
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