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Inferior parietal lobule and early visual areas support elicitation of individualized meanings during narrative listening

View ORCID ProfileSatu Saalasti, Jussi Alho, Moshe Bar, Enrico Glerean, Timo Honkela, Minna Kauppila, Mikko Sams, Iiro Jaaskelainen
doi: https://doi.org/10.1101/301812
Satu Saalasti
University of Helsinki;
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  • For correspondence: satu.saalasti@helsinki.fi
Jussi Alho
Aalto University;
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Moshe Bar
Gonda Multidisciplinary Brain Research Center, Bar-Ilan University;
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Enrico Glerean
Aalto University School of Science
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Timo Honkela
University of Helsinki;
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Minna Kauppila
University of Helsinki;
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Mikko Sams
Aalto University School of Science
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Iiro Jaaskelainen
Aalto University School of Science
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Abstract

When listening to a narrative, the verbal expressions translate into meanings and flow of mental imagery, at best vividly immersing the keen listener into the sights, sounds, scents, objects, actions, and events in the story. However, the same narrative can be heard quite differently based on differences in listeners' previous experiences and knowledge, as the semantics and mental imagery elicited by words and phrases in the story vary extensively between any given two individuals. Here, we capitalized on such inter-individual differences to disclose brain regions that support transformation of narrative into individualized propositional meanings and associated mental imagery by analyzing brain activity associated with behaviorally-assessed individual meanings elicited by a narrative. Sixteen subjects listed words best describing what had come to their minds during each 3-5 sec segment of an eight-minute narrative that they listened during fMRI of brain hemodynamic activity. Similarities in these word listings between subjects, estimated using latent-semantic analysis combined with WordNet knowledge, predicted similarities in brain hemodynamic activity in supramarginal and angular gyri as well as in cuneus. Our results demonstrate how inter-individual differences in semantic representations can be measured and utilized to identify specific brain regions that support the elicitation of individual propositional meanings and the associated mental imagery when one listens to a narrative.

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The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY-NC-ND 4.0 International license.
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Posted April 16, 2018.
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Inferior parietal lobule and early visual areas support elicitation of individualized meanings during narrative listening
Satu Saalasti, Jussi Alho, Moshe Bar, Enrico Glerean, Timo Honkela, Minna Kauppila, Mikko Sams, Iiro Jaaskelainen
bioRxiv 301812; doi: https://doi.org/10.1101/301812
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Inferior parietal lobule and early visual areas support elicitation of individualized meanings during narrative listening
Satu Saalasti, Jussi Alho, Moshe Bar, Enrico Glerean, Timo Honkela, Minna Kauppila, Mikko Sams, Iiro Jaaskelainen
bioRxiv 301812; doi: https://doi.org/10.1101/301812

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