Scientists have identified a signature of a satisfying conversation: pink noise, a middle ground between disjointed chatter and repetitive mirroring. In a study published in Science Advances, researchers at Dartmouth College analysed more than 1,000 conversations between strangers and found that conversations with more pink noise were enjoyed more, and that people felt a stronger sense of connection. The effect also held for conversations between friends and predicted which speed-dating pairs went on second dates.
The researchers used an AI program to score each conversational turn on 768 criteria, including meaning, tone and context, allowing them to quantify how conversations ebbed and flowed. White noise occurs when people fail to follow what has just been said: the chat might jump all over the place or be dominated by a person who seems oblivious to the other person’s responses. Red noise arises when people mirror each other's language and fall into a rut. Pink noise lies between these extremes, a conversational 'Goldilocks zone' that balances stability and flexibility.
First author Kathryn O'Nell said that, in physics, pink noise is described as existing on the edge of chaos. She said it is particularly cool for conversation because people can stay with a topic long enough to get to know each other and understand it without getting stuck there as it gets stale.
Senior author Dr Emily Finn, a neuroscientist, said the idea of being 'in sync' can be 'incredibly dull'.
The researchers also analysed podcasts fronted by two hosts and found that the 'pinkiness' of their conversations increased over the first 50 episodes. O'Nell said she suspected the skill could be learned and developed.
Not everyone is comfortable reducing conversation to a single metric. Prof Elizabeth Stokoe, a conversation analyst at the London School of Economics, praised the work for moving beyond the idea that more similarity is better, but said that focusing on whether a chat is 'enjoyable' can seem bloodless, since many of the conversations that matter most in our lives can be painful and poignant.
Good conversation between two people involves “pink noise,” according to new research. This term refers to fluctuations in semantic similarities—alignments in speech patterns and word choice—across time scales during a chat. scim.ag/4eg9Cme
Identifies a measurable, teachable signature of enjoyable conversation, challenging the simplistic notion that 'being in sync' is always best.
The effect predicts real-world outcomes such as second dates, showing it has practical significance beyond the lab.
If the skill can be learned, as the researchers suspect, it could lead to new approaches for improving communication in personal and professional settings.
Background
Pink noise is a type of signal where each octave carries the same amount of power, often found in natural systems such as rainfall or heartbeats. It sits between white noise (fully random) and red noise (strongly correlated), and in physics is described as existing on the edge of order and chaos. The Dartmouth team applied this concept to conversation, using an AI model to track how dialogue moves between stability and novelty over time. The research highlights the limits of the common metaphor 'being in sync', which can actually signal boredom.
Key Perspectives
Researchers at Dartmouth College: argue that pink noise is the hallmark of an enjoyable, connected conversation, and that it can be learned and improved over time.
Prof Elizabeth Stokoe (London School of Economics): praises the work for moving beyond simple similarity, but cautions that focusing only on 'enjoyable' chats risks missing the deeper, often painful conversations that matter most in life.
What to Watch
Whether further studies will test if people can be trained to increase the pink noise in their own conversations.
Potential application of the concept to AI-powered communication tools, such as chatbots or virtual assistants, to make interactions feel more natural.
Exploration of pink noise in other types of interaction, such as debates, negotiations or therapy sessions.
12 claims in this story checked against 1 source: 11 supported.
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SupportedPink noise is linked to more enjoyable conversations, according to a study.UK news | The Guardian: “The secret of a mutually satisfying exchange is a healthy dose of pink noise, they say.”
SupportedDartmouth research suggests a balance between chaos and repetition is key to satisfying chats.UK news | The Guardian: “Pink noise lies somewhere in between: a conversational Goldilocks zone that balances stability and flexibility.”
SupportedResearchers at Dartmouth analysed more than 1,000 conversations between strangers.UK news | The Guardian: “The researchers analysed more than 1,000 conversations between strangers, who answered questions on the chats afterwards.”
SupportedConversations with more pink noise were enjoyed more.UK news | The Guardian: “People enjoyed conversations more, wanted to continue chatting, and felt a stronger sense of connection when the tête-à-têtes exhibited more pink noise, they found.”
SupportedPeople felt a stronger sense of connection in conversations with more pink noise.UK news | The Guardian: “People enjoyed conversations more, wanted to continue chatting, and felt a stronger sense of connection when the tête-à-têtes exhibited more pink noise, they found.”
SupportedThe effect also appeared in conversations between friends.UK news | The Guardian: “To see whether the effect applied beyond strangers, the researchers ran a similar analysis on conversations between friends about their formative experiences. Again, more pink noise meant more enjoyment.”
SupportedMore pink noise predicted which speed-dating pairs met for a second date.UK news | The Guardian: “When the scientists turned to speed-dating conversations, they found that more pink noise predicted which pairs met up for a second date.”
SupportedAn AI program scored each conversational turn on 768 criteria, including meaning, tone and context.UK news | The Guardian: “The program scored every turn of the chat on 768 different criteria, covering aspects such as meaning, tone and context.”
SupportedWhite noise describes conversations where people fail to follow what was just said, while red noise describes mirroring that falls into a rut.UK news | The Guardian: “Conversations exhibit white noise when people fail to follow what has just been said: the chat might jump all over the place, or be dominated by a person who seems oblivious to the other person’s responses. Other conversations can have red noise, which arises when people mirror each other’s language and fall into a conversational rut.”
SupportedEmily Finn said the idea of being “in sync” can be “incredibly dull.”UK news | The Guardian: ““In sync can be incredibly dull,” she said.”
SupportedThe pinkiness of two-host podcasts increased over their first 50 episodes.UK news | The Guardian: “As part of the study, the team analysed podcasts fronted by two hosts and found that the pinkiness of their conversations increased over the first 50 episodes.”
Partly supportedStokoe’s criticism is framed as discomfort with reducing conversation to a single metric.UK news | The Guardian: ““Reducing conversations to whether they are ‘enjoyable’ can feel bloodless, since many of the conversations that matter most in our lives are like this.””
