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Perceptual Mapping of Chemesthetic Stimuli in Naive Assessors

  • Published:
Chemosensory Perception

Abstract

Introduction

Chemesthetic compounds, responsible for sensations such as burning, cooling, and astringency, are difficult stimuli to work with, especially when the evaluation task requires retasting.

Methods

Here, we developed a protocol by which chemesthetic compounds can be assessed using sorting. We compared the performance of two cohorts of untrained assessors on this task, one with nose clips and the other without. Similarity matrices were analyzed using multidimensional scaling (MDS) to produce perceptual maps for the two cohorts

Results

Overall, the groupings from the nose-open cohort tended to follow a biological basis, consistent with previous findings that suggest compounds that activate a common receptor will elicit similar sensations. The nose-open and nose-pinched cohorts generated significantly different maps. The nose-pinched cohort had a higher variance in the MDS solution than the nose-open group. While the nose-open cohort generated seven clusters, the nose-pinched cohort generated only two clusters, seemingly based on the ready identification of chemesthetic sensations or not. There was less consensus regarding the attributes used to describe the samples in the nose-pinched cohort than in the nose-open cohort as well, as this cohort collectively generated more attributes but fewer were significant in regression.

Conclusion

Sorting can be used with orally delivered chemesthetic stimuli in naive assessors, and the resulting perceptual maps differ when nose clips are worn.

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Acknowledgments

This manuscript was prepared in partial fulfillment of a Doctor of Philosophy degree by the first author. The authors of this manuscript would like to thank Dr. Christopher Simons for his donation of a huajiao extract to be used in the experiment, Laura M. Boone and Meghan Kane for assistance with data collection, and all of our participants for their time and involvement in the study. This work was supported by funds from the Pennsylvania State University, US Department of Agriculture Hatch Project PEN04332 funds, and a National Institutes of Health grant from the National Institute National of Deafness and Communication Disorders [DC010904] to J.E.H.

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Conflict of Interest

The lead author declares no conflict of interest. The second author is presently employed by Ocean Spray Cranberries, Inc, who has no other interest in this work and was not involved in the conception or design of the study or the decision to publish. The corresponding author has previously accepted speaking and/or consulting fees from the Wm. Wrigley Co, General Mills Inc, Tate & Lyle PLC, Symrise AG, and PepsiCo for unrelated work. The corresponding author has also served on the Scientific Advisory Board for Medifast, Inc. None of these organizations have had any influence over study conception, design or interpretation, or the decision to publish these data.

Ethics Declaration

All procedures followed were in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1975, as revised in 2008. Informed consent was obtained from all participants included in the study.

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Correspondence to John E. Hayes.

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ESM 1

Setup used for the sorting task for both cohorts (PNG 2827 kb)

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Byrnes, N.K., Nestrud, M.A. & Hayes, J.E. Perceptual Mapping of Chemesthetic Stimuli in Naive Assessors. Chem. Percept. 8, 19–32 (2015). https://doi.org/10.1007/s12078-015-9178-7

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