Chem. Senses 24: 201-209,
1999
© Oxford University Press
Spatio-temporal Analysis of Cortical Activity Evoked by Gustatory Stimulation in Humans
Human Informatics Department, National Institute of Bioscience and Human-Technology, Higashi1-1, Tsukuba 1 Department of Physiology, Kumamoto University School of Medicine, Kumamoto 2 Sapporo Breweries Ltd, Shizuoka 3 Institute of Psychology, University of Tsukuba, Tsukuba, Japan
Correspondence to be sent to: Tatsu Kobayakawa, National Institute of Bioscience Human-Technology (NIBH), Higashi 1-1, Tsukuba 305-8566, Japan. e-mail:kobayakawa{at}nibh.go.jp
Gustatory activated regions in the cerebral cortex have not been identified precisely in humans. In this study we recorded the magnetic fields from the brain in response to two tastants, 1 M NaCl and 3 mM saccharin. We estimated the location of areas activated sequentially after the onset of stimulation with magnetic source imaging. We investigated the primary gustatory area (area G) precisely, and found it at the transition between the parietal operculum and the insular cortex. The central sulcus was activated less frequently than area G but with almost the same latency in cases of NaCl stimulation. Following area G, we found activation in several cortical regions, e.g. both the frontal operculum and the anterior part of the insula, the hippocampus, the parahippocampal gyrus and the superior temporal sulcus.
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