Openness Is Contagious

Openness Is Contagious

Here's an old finding that explains the new one.

Share something small with a stranger, and something odd tends to happen: they share something small back. Not always the same fact — but roughly the same size. Share something bigger, and the same pattern shows up at a bigger size.

Psychologists have a name for this. It's called the disclosure reciprocity effect — the tendency to match how open the other person just was, almost like an unspoken rule of the conversation. One side opens a door partway. The other side tends to open theirs about the same amount.

This is why the office coworker who tells you about their divorce in the elevator on day one feels off, even if every word is true. They skipped the matching. The size was wrong for how little trust existed yet.

Too much, too soon, backfires. Researchers found this decades ago — the relationship between openness and liking isn't a straight line, it curves. Share nothing, and nobody connects. Share too much before any trust exists, and people pull back instead of leaning in. The right amount depends entirely on what's already been exchanged.

So the small talk before the deep talk isn't wasted motion. It's the calibration. Two people — or a person and a blank page — start with something low-stakes, feel how it lands, and use that to decide how much further to go.

Picture a 34-year-old nurse who starts journaling by writing about her commute. Traffic. A song stuck in her head. Nothing that matters, on the surface. She does this for about a week before she writes, almost by accident, about something that's actually been scaring her.

I don't think that week was wasted either. I think it was the only way she got there.

Writing works the same way conversation does. You can't hand a stranger your trust immediately, and you can't hand a blank page your hardest thought on day one either. The page has to earn it, the same way a person does. One small true sentence at a time, each one giving you a little more evidence that it's safe to write the next, slightly truer one.

That reframes the boring, everyday entries. They were never filler. They were the door slowly opening.

References

Collins, N. L., & Miller, L. C. (1994). Self-disclosure and liking: A meta-analytic review. Psychological Bulletin, 116(3), 457–475.

Cozby, P. C. (1972). Self-disclosure, reciprocity, and liking. Sociometry, 35(1), 151–160.