Distrust easy fluency

Treat "this feels obviously right" as a flag to check, not a signal to proceed.

Why it works

Cognitive ease — when information is fluent, familiar, or repeated — is read by System 1 as truth and competence. Smooth, confident-feeling conclusions are therefore often under-examined. Deliberately introducing a little disfluency (slowing down, writing it out) re-engages System 2’s scrutiny.

How to do it

1. When a claim feels instantly and effortlessly true, treat the ease itself as suspicious.
2. Slow the input: read it again, restate it in your own words, ask for the source.
3. Distinguish "I’ve heard this a lot" from "this is well supported."

Evidence

Processing fluency reliably increases judged truth and confidence (the "illusory truth" effect, the mere-repetition effect), demonstrated across many experiments. (rct)

Fluency is usually a fine guide for routine judgments; the cost of distrusting it everywhere is paralysis. Reserve scrutiny for consequential claims.

Sources

• Hasher, Goldstein & Toppino (1977), illusory truth / frequency-validity effect
• Alter & Oppenheimer (2009), review of fluency effects on judgment

Common mistake

Mistaking familiarity for verification — concluding something is true because you’ve encountered it repeatedly rather than because it’s been checked.