Presentation Details
| Investigating the modulation of retronasal smell and taste perception by carbonation using a novel sip gustometer (SG). Hanzhi Zheng, Tiffany Hsu, Dando Robin, Terry Acree. Cornell University, Ithaca, NY, USA |
Abstract
A recent study using endoscopy showed aerosols generated during the oral processing of liquids, particularly carbonated ones. These flavor-containing liquid droplets when dissolved in the olfactory epithelium were reported to enhance flavor perception. However, other reports indicate that carbonation exerts an inhibitory effect on the brain’s neural processing of flavor perception, and it significantly reduces the neural activity related to sweet taste in key gustatory brain regions with a more pronounced suppressive impact on sucrose than on artificial sweeteners In order to elucidate the modulatory effects of carbonation (possibly caused by aerosols) on flavor perception, this study used a novel gustometer called a Sip Gustometer (SG) that delivers 1ml of a flavored solution to the tip of a subject’s tongue in less than one second. When combined with a Sniff Olfactometer (SO) both controlled by the same PsychoPy program, we hope to parse the effects of retronasal odor detection on the taste perception of carbonated beverages. In the preliminary experiment reported here, we measured the effects of carbonation on the retronasal response to ethyl butyrate odor, an apple-like odorant combined with sucrose and with or without carbonation. A logistic dose-response model was computed using a two alternate forced choice paradigm (“apple smell” or “no apple smell”) in carbonated and non-carbonated water as comparative conditions, and each target sample was prepared at six concentrations from below the threshold to above and tested 6 times. The results from four subjects are precise enough to quantify carbonation’s effects on retronasal aroma and distinguish differences among subjects.
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No part of this publication may be reproduced, distributed, or transmitted in any form or by any means, including photocopying, recording, or other electronic or mechanical methods, without the prior written permission of the author.
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