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Technique to Collect Fungiform Taste Papillae from Human Tongue
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Distinct representations of basic taste qualities in human gustatory cortex.

Junichi Chikazoe1,2, Daniel H Lee3, Nikolaus Kriegeskorte4

  • 1Section of Brain Function Information, Supportive Center for Brain Research, National Institute for Physiological Sciences, Aichi, 4448585, Japan. j.chikazoe@gmail.com.

Nature Communications
|March 7, 2019
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Summary
This summary is machine-generated.

Researchers identified the human gustatory cortex using brain activity patterns. This brain region, located in the insula, distinguishes between sweet, salty, bitter, and sour tastes, clarifying taste perception in humans.

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Area of Science:

  • Neuroscience
  • Sensory Perception
  • Gustation

Background:

  • Mammalian tongues possess gustatory receptors for basic tastes, acting as a hedonic guide for ingestion.
  • Distinct taste type representation defines primary gustatory cortex in animals, but its human counterpart remains unclear.
  • The precise location and function of the human gustatory cortex are not well-established.

Purpose of the Study:

  • To identify regions in the human brain with activity patterns differentially sensitive to basic taste qualities.
  • To delineate the human gustatory cortex by mapping taste-specific neural representations.
  • To investigate whether taste sensation specificity or chemical/receptor specificity underlies neural discrimination.

Main Methods:

  • Utilized distributed multivoxel activity patterns analysis in functional magnetic resonance imaging (fMRI).
  • Examined brain responses to four basic taste qualities: sweet, salty, bitter, and sour.
  • Replicated findings using ultra-high field (7 Tesla) fMRI with varied taste compounds.

Main Results:

  • Identified gustatory cortex in the insula and overlying operculum.
  • Found anterior and middle insula regions capable of discriminating all tested tastes.
  • Demonstrated that neural discrimination reflects taste sensation specificity, not just chemical or receptor properties.

Conclusions:

  • The human gustatory cortex is located within the insula.
  • The insula plays a crucial role in discriminating and integrating different taste qualities.
  • Neural representations in the human gustatory cortex are specific to taste sensations rather than individual chemicals.