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Slide Slam M5

The left Angular Gyrus tracks episodic but not semantic content during narrative comprehension.

Slide Slam Session M, Thursday, October 7, 2021, 6:00 - 8:00 am PDT Log In to set Timezone

Francesca Martina Branzi1, Matthew Lambon Ralph1; 1MRC Cognition and Brain Sciences Unit, University of Cambridge

Language processing involves the construction of complex mental representations, i.e., “event representations”, reflecting current events or situation models. The left angular gyrus (AG) has been often associated with the formation of this type of representations. However, to date, it is unclear whether AG supports the construction of the semantic content of these representations independently from their episodic content, and vice versa. In this fMRI study, we established the unique neural correlates of (1) episodic richness and (2) semantic coherence measured during a narrative reading task. Interestingly, we observed that the number of episodic details in the narratives modulated linearly the activity of the left AG. In contrast, semantic coherence modulated neural responses in the right anterior temporal lobe/middle temporal gyrus, as well as in other brain regions within the posterior medial network, such as the dorsal posterior cingulate cortex.

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