Speaker– Coupled neural systems underlie the production and comprehension of naturalistic narrative speech

 

Lauren J. Silbert, Christopher J. Honey, Erez Simony, David Poeppel, and Uri Hasson

 

 

Neuroimaging studies of language have typically focused on either production or comprehension of single speech utterances such as syllables, words, or sentences. In this study we used a new approach to functional MRI acquisition and analysis to characterize the neural responses during production and comprehension of complex real-life speech. First, using a time-warp based intra-subject correlation method, we identified all areas that are reliably activated in the brains of speakers telling a 15-min-long narrative. Next, we identified areas that are reliably activated in the brains of listeners as they comprehended that same narrative. This allowed us to identify networks of brain regions specific to production and comprehension, as well as those that are shared between the two processes. The results indicate that production of a real-life narrative is not localized to the left hemisphere but recruits an extensive bilateral network, which overlaps extensively with the comprehension system. Moreover, by directly comparing the neural activity time courses during production and comprehension of the same narrative we were able to identify not only the spatial overlap of activity but also areas in which the neural activity is coupled across the speaker’s and listener’s brains during production and comprehension of the same narrative. We demonstrate widespread bilateral coupling between production- and comprehension-related processing within both linguistic and nonlinguistic areas, exposing the surprising extent of shared processes across the two systems.

 

Read more:

1. Silbert LJ, Honey CJ, Simony E, Poeppel D, Hasson U (2014) Coupled neural systems underlie the production and comprehension of naturalistic narrative speech. Proc Natl Acad Sci USA 111:E4687-4696. [PDF]

2. Stephens G, Silbert L, Hasson U (2010) Speaker-listener neural coupling underlies successful communication. Proc Natl Acad Sci USA 107:14425-14430. [PDF]

3. Dikker S, Silbert LJ, Hasson U, Zevin JD (2014) On the same wavelength: predictable language enhances speaker-listener brain-to-brain synchrony in posterior superior temporal gyrus. J Neurosci 34:6267-6272. [PDF]

4. Hasson U, Ghazanfar AA, Galantucci B, Garrod S, Keysers C (2012) Brain-to-brain coupling: a mechanism for creating and sharing a social world. Trends Cogn Sci 16:114-121. [PDF]  

5. Uri Hasson: This is your brain on communication, Ted talk, Filmed Feb 2016, [TED2016]