Precognition (from the Latin præ-, “prior to,” + cognitio, “acquiring knowledge”), also called future sight, refers to perception that involves the acquisition of future information that cannot be deduced from presently available and normally acquired sense-based information. The related terms, premonition (from the Latin praemonēre) and presentiment refer to information about future events that is perceived as emotions. The terms are usually used to denote a seemingly parapsychological or extrasensory process of perception, including clairvoyance. Various psychological processes, making no reference to psi, have also been offered to explain the phenomena.
As with other forms of extrasensory perception, the existence of precognition is not accepted by the scientific community, because no replicable demonstration has been achieved. Scientific investigation of extrasensory perception (ESP) is complicated by the definition which implies that the phenomena go against established principles of science. Specifically, precognition would violate the principle that an effect cannot occur before its cause. However, there are established biases, affecting human memory and judgment of probability, that can create a convincing but false impression of precognition.
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