From Wikipedia, the free encyclopedia
The concept does not question, or compete with, the notion of causality. Instead, it maintains that just as events may be grouped by cause, they may also be grouped by their meaning. Since meaning is a complex mental construction, subject to conscious and subconscious influence, not every correlation in the grouping of events by meaning needs to have an explanation in terms of cause and effect.
The idea of synchronicity is that the conceptual relationship of minds, defined as the relationship between ideas, is intricately structured in its ownlogical way and gives rise to relationships that are not causal in nature. These relationships can manifest themselves as simultaneous occurrences that are meaningfully related—the cause and the effect occur together.
Synchronous events reveal an underlying pattern, a conceptual framework that encompasses, but is larger than, any of the systems that display the synchronicity. The suggestion of a larger framework is essential to satisfy the definition of synchronicity as originally developed by Swiss psychologistCarl Gustav Jung.
Jung coined the word to describe what he called “temporally coincident occurrences of acausal events.” Jung variously described synchronicity as an “acausal connecting principle”, “meaningful coincidence” and “acausal parallelism”. Jung introduced the concept as early as the 1920s but only gave a full statement of it in 1951 in an Eranos lecture and in 1952, published a paper, Synchronicity — An Acausal Connecting Principle, in a volume with a related study by the physicist (and Nobel laureate) Wolfgang Pauli.
It was a principle that Jung felt gave conclusive evidence for his concepts of archetypes and the collective unconscious, in that it was descriptive of a governing dynamic that underlies the whole of human experience and history—social, emotional, psychological, and spiritual. Concurrent events that first appear to be coincidental but later turn out to be causally related are termed incoincident.
Jung believed that many experiences that are coincidences due to chance in terms of causality suggested the manifestation of parallel events or circumstances in terms of meaning, reflecting this governing dynamic.
One of Jung’s favourite quotes on synchronicity was from Through the Looking-Glass by Lewis Carroll, in which the White Queen says to Alice: “It’s a poor sort of memory that only works backwards”. 
In psychology and cognitive science, confirmation bias is a tendency to search for or interpret new information in a way that confirms one’s preconceptions and avoids information and interpretations that contradict prior beliefs. It is a type of cognitive bias and represents an error of inductive inference, or as a form of selection bias toward confirmation of the hypothesis under study or disconfirmation of an alternative hypothesis. Confirmation bias is of interest in the teaching of critical thinking, as the skill is misused if rigorous critical scrutiny is applied only to evidence challenging a preconceived idea but not to evidence supporting it.
Wolfgang Pauli, a scientist who in his professional life was severely critical of confirmation bias, made some effort to investigate the phenomenon, coauthoring a paper with Jung on the subject. Some of the evidence that Pauli cited was that ideas that occurred in his dreams would have synchronous analogs in later correspondence with distant collaborators.
The French writer Émile Deschamps claims in his memoirs that in 1805, he was treated to some plum pudding by a stranger named Monsieur de Fontgibu. Ten years later, the writer encountered plum pudding on the menu of a Paris restaurant and wanted to order some, but the waiter told him that the last dish had already been served to another customer, who turned out to be de Fontgibu. Many years later, in 1832, Émile Deschamps was at a diner and was once again offered plum pudding. He recalled the earlier incident and told his friends that only de Fontgibu was missing to make the setting complete—and in the same instant, the now senile de Fontgibu entered the room.
In his book Synchronicity (1952), Jung tells the following story as an example of a synchronistic event: “A young woman I was treating had, at a critical moment, a dream in which she was given a golden scarab. While she was telling me this dream, I sat with my back to the closed window. Suddenly I heard a noise behind me, like a gentle tapping. I turned round and saw a flying insect knocking against the window-pane from the outside. I opened the window and caught the creature in the air as it flew in. It was the nearest analogy to a golden scarab one finds in our latitudes, a scarabaeud beetle, the common rose-chafer (Cetonia aurata), which, contrary to its usual habits had evidently felt the urge to get into a dark room at this particular moment. I must admit that nothing like it ever happened to me before or since.” 
Simultaneous discovery is the creation of the same new idea at causally disconnected places by two persons at approximately the same time. If, for example, an American and a British musician, having never had anything to do with one another, arrived at the same musical concept, chord sequence, feel or lyrics at the same time in different places, this would be an example of synchronicity. The wardrobe department for The Wizard of Oz unknowingly purchased a coat for character Professor Marvel from a second-hand store, which was later verified to have originally been owned by L. Frank Baum, the author of the novel on which the film was based. The comic strip character Dennis The Menace featuring a young boy in a red and black striped shirt debuted on March 12, 1951 in 16 newspapers in the United States. Three days later in the UK a character called Dennis The Menace, wearing a red and black striped jumper made his debut in children’s comic The Beano. Both creators have denied any causal connection.
Jung wrote, after describing some examples, “When coincidences pile up in this way, one cannot help being impressed by them — for the greater the number of terms in such a series, or the more unusual its character, the more improbable it becomes.”
Synchronicity (disambiguation).is the experience of two or more events that are causally unrelated occurring together in a meaningful manner. To count as synchronicity, the events should be unlikely to occur together by chance.