Personal Incredulity
Also known as: argument from incredulity
Rejecting a claim because you personally find it hard to imagine or understand.
Examples
A friend is skeptical about how a coworker got a promotion.
Jae: “She’s only been here eight months. I can’t see how she’d be ready to lead the team already.” Nora: “Have you looked at what she’s actually shipped this year?” Jae: “No, but I just can’t picture it.”
Jae’s difficulty picturing it isn’t evidence about the coworker’s readiness — it’s a statement about the limits of Jae’s own information and imagination.
The same pattern shows up often in online science threads:
Post: “I don’t see how a bird’s wing could have evolved gradually — half a wing is useless, so evolution can’t explain it.” Reply: “There’s a large body of research on transitional forms like feathered gliders — the intermediate stages did serve purposes, just not flight.”
Not being able to picture the intermediate steps oneself doesn’t mean biologists haven’t worked them out.
Why the reasoning fails
Personal incredulity treats “I can’t imagine how this could be true” as if it were “this can’t be true.” But an explanation can be real and correct while still being outside what one person can easily picture — that’s true of a lot of specialized knowledge, from how airplanes generate lift to how a promotion committee weighs evidence nobody outside the room has seen. The gap being pointed at is often a gap in the speaker’s own understanding, not a gap in the explanation itself. The honest version of “I can’t picture how this works” is a question — “how does this work?” — not a conclusion that it doesn’t.
How to respond
- Reframe it as a question, not a verdict: “What would help you see how it works, rather than concluding it doesn’t?”
- Ask what’s actually known here that you might be missing: “Is there research or detail on this that would fill the gap?”
- Name the move plainly, kindly: “That sounds like it’s hard to imagine, rather than actually shown to be false.”
- Stay humble about genuinely unresolved cases — sometimes an explanation really is incomplete, and “I don’t understand this yet” is a fine place to leave things, rather than forcing it into true or false.