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Chem. Senses 28: 245-251, 2003
© Oxford University Press 2003

Magnetoencephalographic Study of Cortical Activity Evoked by Electrogustatory Stimuli

Chizuko Yamamoto, Shiho Takehara, Kiyomi Morikawa, Seiji Nakagawa1, Masahiko Yamaguchi1, Sunao Iwaki1, Mitsuo Tonoike1 and Takashi Yamamoto

Department of Behavioral Physiology, Graduate School of Human Sciences, Osaka University, 1-2 Yamadaoka, Suita, Osaka 565-0871 1 Life Electronics Laboratory, National Instistute of Advanced Industrial Science and Technology (AIST), 1-8-31, Midorigaoka, Ikeda, Osaka 563-8577, Japan

Correspondence to: Takashi Yamamoto, Department of Behavioral Physiology, Graduate School of Human Sciences, Osaka University, 1-2 Yamadaoka, Suita, Osaka 565-0871, Japan. e-mail:yamamoto{at}hus.osaka-u.ac.jp

Electrogustometry is a convenient method to examine taste acuity in clinical situations. Some basic properties of neural activity in the cerebral cortex in response to electrogustatory stimulation were revealed by measuring magnetoencephalography (MEG) signals with a whole-cortex-type system in response to varying intensities of anodal DC currents focally applied to the tongue surface in human subjects. Independent component analysis was used to eliminate stimulus artifacts in MEG signals. Electrogustatory stimulation with intensities of induced electric taste evoked responses bilaterally, mainly in the opercular–insular cortex with a mean onset latency of ~350 ms, while subthreshold electrogustatory stimulation induced modest responses in the cortex. Stronger stimulation induced a tingling sensation and elicited large transient responses in both the opercular–insular and somatic sensory cortices. This is the first description of the basic properties of human MEG responses to electrogustatory stimulation.

Key words: electric taste, human, magnetoencephalography, taste

February 25, 2003


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