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    Conversation Sparks Mirrored Brain Activity

    Study Finds Similar Brain Activity in Speaker/Listener Pairs
    WebMD Health News
    Reviewed by Louise Chang, MD

    July 26, 2010 -- Verbal communication is conveyed from speakers to listeners in a kind of mild melding brain process -- call it a meeting of the minds -- that facilitates understanding of what’s being said, a new study suggests.

    Princeton University researchers using functional magnetic resonance imaging (fMRI) looked at brain activity in 12 native-English listeners, listening native-English speakers, and a native-Russian speaker in several experiments.

    They found that brain activity in speaker/listener pairs was similar, and that the same regions “lit up” in the storyteller and the listeners. Put in terms of the researchers, neural coupling occurred, and that’s what underlies successful communicating, physicist and lead author Greg J. Stephens, PhD, of Princeton, tells WebMD.

    The article says that the “similarity in the response patterns across all listeners underscores a strong tendency to process incoming verbal information in similar ways.”

    The Study

    The researchers performed the brain scans on a communicator and the listeners, first when a speaker told a long, unrehearsed story. Then the speaker told a new, unrehearsed 15-minute story about an experience that occurred years before. The same procedure was then used with a Russian speaker.

    “If you speak in terms listeners don’t understand, there is very little neural coupling,” Stephens tells WebMD. “It extends only to low order auditory areas. They hear Russian but don’t do anything with it.”

    When the speaking was in Russian, the results were starkly different -- brain regions that showed activity when listening to stories did not activate similarly in talkers and listeners, indicating that participants were not able to “extract the information” when dialogue was spoken in a foreign tongue, Stephens says.

    He says the researchers conclude that “coupling” among people involved in a dialogue emerges only in a shared conversation, that is, when the same language is being spoken.

    Also, in most brain regions of study participants, the activity in the listeners’ brains lagged activity in the speaker’s brain by one to three seconds, the authors write.

    Neural Coupling

    "It’s true that if you look, on average, across the brain, the listener’s activity is delayed relative to the speaker,” Stephens tells WebMD. “This makes sense. It takes time to process incoming information.”

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