The Processing-Fluency Message Test
Make accurate ideas easier to process without confusing ease with truth
- Difficulty
- Easy
- Time to result
- ~days to results
- Steps
- 5
- Confidence
- 93%
Sharot describes processing fluency as the ease with which the brain handles information. Repeated, familiar, legible, or clearly heard statements require less effort, and people may interpret that ease as a sign that the statement is more likely to be true. An ethical communicator can use the mechanism to reduce needless friction around an already supported message: verify the claim, relate it to relevant knowledge the audience already holds, state it simply, make it easy to read or hear, and repeat only the essential point. Then test comprehension rather than treating agreement as proof. The safeguard is central: fluent presentation can influence belief, but it does not make a claim accurate.
Origin
Tali Sharot described the illusory-truth and processing-fluency findings on The Diary of a CEO, including effects from repetition and legibility.
Core principles
- 01Familiar information requires less processing
- 02Ease of processing can be misread as evidence of truth
- 03Clear presentation can improve uptake of a valid message
- 04Repetition must not substitute for evidence
How to run it
- 1
Verify the substance
Establish that the claim is accurate and appropriately qualified before improving its presentation.
Pro tip Keep the evidence or source available beside the draft.
Watch out Fluency can amplify falsehood as easily as truth.
- 2
Find a relevant prior
Identify an accurate concept the audience already understands and connect the new point to it.
Pro tip Make the logical connection explicit.
Watch out Do not smuggle a weak claim beside an accepted one.
- 3
Remove processing friction
Use direct language, a legible format, and clean audio or visuals so effort goes into the idea rather than decoding it.
Pro tip Prefer one clear sentence before adding detail.
- 4
Repeat with restraint
Restate the central point only where it helps recall or understanding.
Pro tip Use consistent wording for the core claim.
Watch out Repeated exposure can create familiarity without understanding.
- 5
Test comprehension
Ask the audience to explain the idea or apply it. Correct misunderstandings and preserve qualifications.
Watch out Clicks or agreement do not establish comprehension or truth.
In the wild
A manager first verifies a new expense rule, then explains it through the familiar idea of pre-approval already used for travel. The message uses one clear heading, a short example, and a repeated deadline. A follow-up question asks employees to identify which purchases need approval.
→ The supported rule becomes easier to understand without presenting familiarity as evidence.
Common mistakes
Optimising before fact-checking
A polished false or overstated claim is more dangerous, not more useful.
Using repetition as proof
Hearing a statement several times can raise belief even when no new evidence has been supplied.
Is it for you?
Best for
People explaining evidence-based recommendations, changes, or unfamiliar concepts.
Not ideal for
Weak, disputed, or deceptive claims that are being made to feel true through repetition or design.
From the transcript
“it's called the illus truth effect”
“when something requires less effort and less energy to process we believe it more”
“you want to make it easier for them to process it”
From the episode
No.1 Neuroscientist: NEW Research Explains Why Life, Work & Your Sex Life will eventually get Boring! (HOW TO STOP THIS HAPPENING) Dr. Tali Sharot