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Examination and Validation of Classification Schema for Determining Thermal Taste Status

  • Margaret Thibodeau
  • Anthony Saliba
  • Martha Bajec
  • Gary PickeringEmail author
Article

Abstract

Introduction

Thermal taster status (TTS) is determined when the tongue is cooled or warmed, whereby thermal tasters (TT) experience a taste sensation while thermal nontasters (TnT) do not. The literature suggests that TT experience greater responsiveness (higher intensity ratings) to orosensory stimuli; however, small sample sizes and differences in classification schemes between studies confound our understanding of TTS. In addition, up to 50% of individuals (nonclassifiables, NC) have been excluded from previous studies and have yet to be characterized.

Methods

Raw responses to the thermal-elicitation procedure were used to determine the TTS of the same participants using four published classification schemes, and concordance between the schemes was examined using Fleiss’ kappa. Using a large convenience sample (n = 708), we tested for differences in orosensory (ANOVA) and temperature (Mann-Whitney U) responsiveness between TT, TnT, and NC.

Results

TT are more responsive than TnT to both orosensations and temperature changes, regardless of the classification method used despite only moderate concordance between the schemes. Overall, the orosensory and temperature responsiveness of NC is intermediate to that of TT and TnT. However, the responses of NC are not homogeneous and subgroups are identified.

Conclusions

The trend of TT being more responsive to orosensory and temperature stimuli is confirmed. The responsiveness patterns of NC subgroups suggest they are misclassified TT and TnT, and can be included in future studies examining thermal tasting.

Implications

TTS is an important source of individual differences in orosensory responsiveness, and our findings inform best practices for thermal elicitation and classification.

Keywords

Thermal taste Individual differences Orosensations Temperature Methodology 

Notes

Acknowledgements

Alex Bartolini, Alison Moyes, Sarah Lucas, Atzin Gonzalez, Hannah Pickering, Stephanie Small-Kelly, Rachel Kvas, Lynda van Zuiden, and Catherine Klodnicki are sincerely thanked for assistance with collecting data. The contribution of the participants is gratefully acknowledged.

Compliance with Ethical Standards

Funding

This project was funded by a Natural Sciences and Engineering Research Council of Canada Discovery Grant to GP.

Conflict of Interest

The authors declare that they have no conflict of interest.

Ethical Approval

All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee (Brock University Research Ethics Board, REB-05-258, 08-006, 08-065, 08-216, 10-193, 12-116, 12-181,14-119, 14-120, 15-018) and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Informed consent was obtained from all individual participants included in the study.

Supplementary material

12078_2019_9264_MOESM1_ESM.docx (57 kb)
ESM 1 (DOCX 56 kb)

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Biological SciencesBrock UniversitySt. CatharinesCanada
  2. 2.Charles Sturt UniversityWagga WaggaAustralia
  3. 3.Applied Consumer and Clinical Evaluations Inc.MississaugaCanada
  4. 4.Cool Climate Oenology and Viticulture InstituteBrock UniversitySt. CatharinesCanada
  5. 5.Department of PsychologyBrock UniversitySt. CatharinesCanada

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