Gustatory imagery reveals functional connectivity from the prefrontal to insular cortices traced with magnetoencephalography.

Our experience and prejudice concerning food play an important role in modulating gustatory information processing; gustatory memory stored in the central nervous system influences gustatory information arising from the peripheral nervous system. We have elucidated the mechanism of the "top-dow...

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Autores principales:	Masayuki Kobayashi, Tetsuya Sasabe, Yoshihito Shigihara, Masaaki Tanaka, Yasuyoshi Watanabe
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2011
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/c0d63db42fde46618a22ab068759870c
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spelling	oai:doaj.org-article:c0d63db42fde46618a22ab068759870c2021-11-18T06:50:33ZGustatory imagery reveals functional connectivity from the prefrontal to insular cortices traced with magnetoencephalography.1932-620310.1371/journal.pone.0021736https://doaj.org/article/c0d63db42fde46618a22ab068759870c2011-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/21760903/pdf/?tool=EBIhttps://doaj.org/toc/1932-6203Our experience and prejudice concerning food play an important role in modulating gustatory information processing; gustatory memory stored in the central nervous system influences gustatory information arising from the peripheral nervous system. We have elucidated the mechanism of the "top-down" modulation of taste perception in humans using functional magnetic resonance imaging (fMRI) and demonstrated that gustatory imagery is mediated by the prefrontal (PFC) and insular cortices (IC). However, the temporal order of activation of these brain regions during gustatory imagery is still an open issue. To explore the source of "top-down" signals during gustatory imagery tasks, we analyzed the temporal activation patterns of activated regions in the cerebral cortex using another non-invasive brain imaging technique, magnetoencephalography (MEG). Gustatory imagery tasks were presented by words (Letter G-V) or pictures (Picture G-V) of foods/beverages, and participants were requested to recall their taste. In the Letter G-V session, 7/9 (77.8%) participants showed activation in the IC with a latency of 401.7±34.7 ms (n = 7) from the onset of word exhibition. In 5/7 (71.4%) participants who exhibited IC activation, the PFC was activated prior to the IC at a latency of 315.2±56.5 ms (n = 5), which was significantly shorter than the latency to the IC activation. In the Picture G-V session, the IC was activated in 6/9 (66.7%) participants, and only 1/9 (11.1%) participants showed activation in the PFC. There was no significant dominance between the right and left IC or PFC during gustatory imagery. These results support those from our previous fMRI study in that the Letter G-V session rather than the Picture G-V session effectively activates the PFC and IC and strengthen the hypothesis that the PFC mediates "top-down" control of retrieving gustatory information from the storage of long-term memories and in turn activates the IC.Masayuki KobayashiTetsuya SasabeYoshihito ShigiharaMasaaki TanakaYasuyoshi WatanabePublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 6, Iss 7, p e21736 (2011)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Masayuki Kobayashi Tetsuya Sasabe Yoshihito Shigihara Masaaki Tanaka Yasuyoshi Watanabe Gustatory imagery reveals functional connectivity from the prefrontal to insular cortices traced with magnetoencephalography.
description	Our experience and prejudice concerning food play an important role in modulating gustatory information processing; gustatory memory stored in the central nervous system influences gustatory information arising from the peripheral nervous system. We have elucidated the mechanism of the "top-down" modulation of taste perception in humans using functional magnetic resonance imaging (fMRI) and demonstrated that gustatory imagery is mediated by the prefrontal (PFC) and insular cortices (IC). However, the temporal order of activation of these brain regions during gustatory imagery is still an open issue. To explore the source of "top-down" signals during gustatory imagery tasks, we analyzed the temporal activation patterns of activated regions in the cerebral cortex using another non-invasive brain imaging technique, magnetoencephalography (MEG). Gustatory imagery tasks were presented by words (Letter G-V) or pictures (Picture G-V) of foods/beverages, and participants were requested to recall their taste. In the Letter G-V session, 7/9 (77.8%) participants showed activation in the IC with a latency of 401.7±34.7 ms (n = 7) from the onset of word exhibition. In 5/7 (71.4%) participants who exhibited IC activation, the PFC was activated prior to the IC at a latency of 315.2±56.5 ms (n = 5), which was significantly shorter than the latency to the IC activation. In the Picture G-V session, the IC was activated in 6/9 (66.7%) participants, and only 1/9 (11.1%) participants showed activation in the PFC. There was no significant dominance between the right and left IC or PFC during gustatory imagery. These results support those from our previous fMRI study in that the Letter G-V session rather than the Picture G-V session effectively activates the PFC and IC and strengthen the hypothesis that the PFC mediates "top-down" control of retrieving gustatory information from the storage of long-term memories and in turn activates the IC.
format	article
author	Masayuki Kobayashi Tetsuya Sasabe Yoshihito Shigihara Masaaki Tanaka Yasuyoshi Watanabe
author_facet	Masayuki Kobayashi Tetsuya Sasabe Yoshihito Shigihara Masaaki Tanaka Yasuyoshi Watanabe
author_sort	Masayuki Kobayashi
title	Gustatory imagery reveals functional connectivity from the prefrontal to insular cortices traced with magnetoencephalography.
title_short	Gustatory imagery reveals functional connectivity from the prefrontal to insular cortices traced with magnetoencephalography.
title_full	Gustatory imagery reveals functional connectivity from the prefrontal to insular cortices traced with magnetoencephalography.
title_fullStr	Gustatory imagery reveals functional connectivity from the prefrontal to insular cortices traced with magnetoencephalography.
title_full_unstemmed	Gustatory imagery reveals functional connectivity from the prefrontal to insular cortices traced with magnetoencephalography.
title_sort	gustatory imagery reveals functional connectivity from the prefrontal to insular cortices traced with magnetoencephalography.
publisher	Public Library of Science (PLoS)
publishDate	2011
url	https://doaj.org/article/c0d63db42fde46618a22ab068759870c
work_keys_str_mv	AT masayukikobayashi gustatoryimageryrevealsfunctionalconnectivityfromtheprefrontaltoinsularcorticestracedwithmagnetoencephalography AT tetsuyasasabe gustatoryimageryrevealsfunctionalconnectivityfromtheprefrontaltoinsularcorticestracedwithmagnetoencephalography AT yoshihitoshigihara gustatoryimageryrevealsfunctionalconnectivityfromtheprefrontaltoinsularcorticestracedwithmagnetoencephalography AT masaakitanaka gustatoryimageryrevealsfunctionalconnectivityfromtheprefrontaltoinsularcorticestracedwithmagnetoencephalography AT yasuyoshiwatanabe gustatoryimageryrevealsfunctionalconnectivityfromtheprefrontaltoinsularcorticestracedwithmagnetoencephalography
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Gustatory imagery reveals functional connectivity from the prefrontal to insular cortices traced with magnetoencephalography.

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