Definition
A perceived relationship between two events or variables that does not actually exist, or whose strength is overestimated, based on limited or selective experience. In aeromedical and human-factors contexts, illusory correlation is a cognitive error in which a pilot believes one factor reliably predicts or causes another when the real-world data does not support that link.
Plain English
Thinking two things are connected when they really aren't, just because they seemed to happen together a few times.
Context Anchor
Seen in aviation decision-making, risk management, and accident-analysis discussions.
Derivation
From Latin illusorius, meaning 'deceptive' or 'mocking,' and correlation, from Latin com- ('together') and relatio ('a bringing back'). Together it literally means a 'deceptive linking together' — a connection that looks real but isn't.
Why Pilots Care
Can lead to faulty assumptions during flight planning or in-flight decisions based on imagined patterns rather than real data.
Grounding Statement
If two things happen near each other in time, that does not automatically mean one caused the other.
Intuition Check
Do not assume that a repeated coincidence is proof of a real connection. In this term, the key idea is that the connection only appears to exist, or appears stronger than it really is.
Example Sentence 1
The instructor warned the student that assuming a smooth flight always follows a clear preflight briefing is an illusory correlation, not a reliable rule.
Example Sentence 2
During debrief the instructor explained that the student's reluctance to fly at night came from an illusory correlation between darkness and past minor incidents.