Concepts

The gambler's fallacy

Psychology

The belief that after a streak of one outcome, the opposite is "due" — the arithmetic twin of reading meaning into runs of events.

Regression to the mean

Term identified by Francis Galton

Why the "miraculous" recovery after a low point is often just statistics, not a sign: extreme events are followed by average ones.

Magical thinking

Psychology

The belief that inner states and outer events are connected — the psychological soil in which synchronicity grows.

The frequency illusion (Baader–Meinhof)

Psychology

Learn a new word and suddenly it is everywhere. The frequency illusion is attention plus confirmation bias: the thing was always there, you just started noticing it.

Confirmation bias

Psychology

We notice the hits and forget the misses. Confirmation bias is why a single "uncanny" coincidence feels like proof while the thousand ordinary moments that surrounded it are invisible.

The Pauli Effect

Anecdote

The joking observation that laboratory equipment would mysteriously fail in Wolfgang Pauli's presence. Physicists treated it as a curse, not a theory.

Pareidolia

Psychology

Seeing faces in clouds or toast. Pareidolia is apophenia applied to vision, and it is how the brain turns random texture into something that looks like a message.

What is synchronicity?

A synchronicity is a meaningful coincidence: two things line up in time and feel connected, even though one did not cause the other. Carl Jung named the idea in 1952.

The law of truly large numbers

Persi Diaconis & Frederick Mosteller (1989)

With a large enough number of events, even very rare ones become certain to happen. A one-in-a-million event happens to about eight people every day in the United States.

Apophenia

Term coined by Klaus Conrad (1958)

The tendency to see meaningful patterns in random or meaningless data. It is the skeptic's core explanation for most synchronicity experiences.

Serendipity

Term coined by Horace Walpole (1754)

A happy accident: finding something valuable you were not looking for. Serendipity is the friendly cousin of coincidence — lucky, but not necessarily meaningful.