Credit: Unsplash.You know those conversations that make you completely lose track of time? One minute you’re talking about weekend plans. The next, you’re swapping embarrassing stories, laughing uncontrollably, and wondering how an hour just disappeared.
Then there are the other conversations. The awkward ones, where every question feels like hard work and you’re desperately searching for something interesting to say or looking on your phone.
What makes the difference? According to a new study from Dartmouth College, the secret to a great conversation may lie in a surprising mathematical pattern called pink noise.
It has nothing to do with the sound of our voices. Instead, it describes how two people move between familiar ground and new ideas, sometimes thinking alike, sometimes veering apart, but continually finding their way back to each other.
After analyzing thousands of conversations, researchers found that this hidden rhythm was associated with greater enjoyment, stronger feelings of connection, and even better odds of a successful first date.
Somewhere Between Boring and Chaotic
Think of a conversation between two people who keep circling the same point without adding anything new. Now imagine the opposite: Every reply jumps to an unrelated subject. Neither exchange is likely to feel particularly rewarding.
As the researchers write in their study, “Discussing perfectly aligned opinions becomes boring.”
Pink noise describes a middle ground. In mathematics, it is a pattern in which fluctuations unfold over many timescales, with slower changes carrying more weight than rapid ones. In conversation, that could mean staying with a shared idea for several exchanges, wandering into something new, and eventually finding common ground again.
The authors call it a “goldilocks zone” between chaos and rigidity in their new paper, published in Science Advances.
To look for the pattern, Kathryn O’Nell, Kiara Sanchez and Emily Finn fed transcripts into MPNet, an AI model that converts text into numbers encoding meaning. They measured how similar successive speaking turns were, tracked similarity over time, and compared the result with scrambled versions of the same conversations.
In 1,656 video conversations between strangers, stronger pink-noise patterns were linked with greater enjoyment and a stronger feeling of connection. Participants were also likelier to wish the chat had continued.
The researchers found a similar link in 97 conversations between friends, though the result became less convincing after accounting for how long people talked. Interestingly, the pattern was much weaker when they examined each person’s speech separately. This suggests that the rhythm of a good conversation comes from the back-and-forth between two people, rather than either person’s individual speaking style.
So what does a conversation with pink noise actually sound like more specifically?
In their study, the researchers explain that speakers “remain aligned for a while, diverge as one introduces something new, then realign as the other picks it up and develops it further.”
Imagine two friends discussing their weekend plans. One mentions hiking, prompting the other to ask about favorite trails. Soon they’re talking about a trip to Yosemite. Then someone brings up music, and the discussion shifts to whether they prefer listening to songs or enjoying the silence while hiking.
The conversation keeps evolving, but each new idea connects to something that came before. Neither person simply repeats the other, and neither abruptly changes the subject without giving their partner something to work with.
From First Dates to Podcast Partners
The researchers then took it to the next level and looked at how pink noise moderated dating, specifically whether two strangers wanted another date.
They analyzed 31 ten-minute calls from the Blink Date podcast. Nineteen pairs were classified as matches because both participants said “yes” or “maybe” to meeting again. Those conversations showed stronger pink-noise patterns than the 12 that didn’t match. It’s intriguing, although a small sample.
Even an AI reproduced the pattern. Asked to write 50 enjoyable and 50 unpleasant fictional conversations, Claude Sonnet 3.7 generated “good” dialogues with stronger pink-noise signals, which human readers rated favorably.
Earlier, a 2011 study found that language-style matching during speed dates predicted mutual romantic interest. Research in 2022 found that faster replies were associated with feeling connected.
Still, the researchers caution against treating pink noise as a recipe for charm. “The main limitation of this work is that it is observational and correlational,” the authors write in Science Advances. It remains unclear whether that rhythm makes conversations enjoyable or emerges because people are already enjoying themselves.
For now, the takeaway is less about following a formula than leaving room for a shared conversation to go somewhere unexpected.
