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024 7 _ |a 10.1073/pnas.1916329117
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100 1 _ |a Porcu, Emanuele
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245 _ _ |a Macroscopic information-based taste representations in insular cortex are shaped by stimulus concentration
260 _ _ |a Washington, DC
|c 2020
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520 _ _ |a Taste processing is an essential ability in all animals signaling potential harm or benefit of ingestive behavior. However, current evidence for cortical taste representations remains contradictory. To address this issue, high-resolution functional MRI (fMRI) and multivariate pattern analysis were used to characterize taste-related informational content in human insular cortex, which contains primary gustatory cortex. Human participants judged pleasantness and intensity of low- and high-concentration tastes (salty, sweet, sour, and bitter) in two fMRI experiments on two different days to test for task- and concentration-invariant taste representations. We observed patterns of fMRI activity within insular cortex narrowly tuned to specific tastants consistently across tasks in all participants. Fewer patterns responded to more than one taste category. Importantly, changes in taste concentration altered the spatial layout of putative taste-specific patterns with distinct, almost nonoverlapping patterns for each taste category at different concentration levels. Together, our results point at macroscopic representations in human insular cortex as a complex function of taste category and concentration rather than representations based solely on taste identity.
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700 1 _ |a Benz, Karsta M.
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700 1 _ |a Ball, Felix
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700 1 _ |a Tempelmann, Claus
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700 1 _ |a Hanke, Michael
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700 1 _ |a Noesselt, Toemme
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773 _ _ |a 10.1073/pnas.1916329117
|g Vol. 117, no. 13, p. 7409 - 7417
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|t Proceedings of the National Academy of Sciences of the United States of America
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