Researchers decode speech rhythm from brain activity

New in JNeurosci, Pyry Heikkinen and colleagues, from the University of Helsinki, explored how emotional meaning influences the way the human brain prioritizes information during naturally spoken conversations in a cocktail party setting.

The researchers compared the brain activity of 32 people as the participants saw and heard two types of conversations with another dialogue occurring concurrently. One conversational context involved exchanging emotionally meaningful information, while the other involved exchanging more neutral information. Conversations with unpleasant emotions that were highly arousing and socially relevant strengthened how well the brain tracked speech.

The research team also found that when the conversation didn't form a coherent narrative but instead abruptly jumped from topic to topic, the brain used more resources longer to process emotionally significant conversations.

We could predict the rhythm of speech a participant was hearing more accurately from their brain activity alone when the conversation contained emotional meaning." Further analysis pointed to when certain brain areas became involved in prioritizing and processing speech during different types of conversations."

Pyry Heikkinen, University of Helsinki

Heikkinen added, "These findings suggest that the brain handles emotional speech differently depending on how the conversation flows. Sudden topic changes may require more work to process, while connected comments help the brain use the previously established context to predict what comes next and thus process speech more efficiently."

It's possible that this more efficient processing contributes to more engaging conversations by improving understanding of others' speech and helping quickly prepare appropriate replies.