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Gustatory evoked magnetic fields in humans

N Murayama1, N Nakasato, K Hatanaka

  • 1Department of Electrical Engineering and Computer Science, Faculty of Engineering, Kumamoto University, Japan. murayama@eecs.kumamoto-u.ac.jp

Neuroscience Letters
|May 31, 1996
PubMed
Summary

Human tongue taste stimuli generate measurable magnetic fields, detected using magnetoencephalography. These taste-evoked magnetic responses (N175m) were localized to specific brain regions, offering insights into gustatory processing.

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Area of Science:

  • Neuroscience
  • Sensory Physiology
  • Biophysics

Background:

  • Taste perception involves complex neural processing.
  • Magnetoencephalography (MEG) offers high temporal and spatial resolution for brain activity.
  • Previous studies have explored taste pathways, but precise localization remains an area of investigation.

Purpose of the Study:

  • To measure and localize magnetic fields evoked by taste stimuli on the human tongue.
  • To identify the specific brain regions activated by different taste qualities (sweet and salty).
  • To investigate the neural correlates of taste processing using whole-head MEG.

Main Methods:

  • Utilized a 64-channel magnetoencephalography (MEG) system to record whole-head magnetic fields.
  • Administered taste stimuli including 10% glucose, 0.3 M NaCl, and distilled water to five healthy subjects.

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  • Employed a two-dipole model within a spherical conducting medium, informed by individual head dimensions and MRI, to localize neural sources.

    • Main Results:

    • Identified a prominent magnetic field peak (N175m) with a latency of 150-210 ms over bilateral hemispheres.
    • Localized the N175m sources for glucose and NaCl stimuli to the operculum and circum-insular areas in both hemispheres.
    • Failed to accurately locate the dipole sources for distilled water stimuli, suggesting differential processing or weaker magnetic field generation.

    Conclusions:

    • Taste stimuli, specifically sweet and salty, evoke measurable magnetic responses in specific human brain regions.
    • The operculum and circum-insular cortex are key areas involved in processing sweet and salty taste information.
    • MEG is a viable technique for investigating the neural basis of gustation, although stimulus-dependent limitations exist.