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Unspecified duo-trio tests can be as powerful as the specified 2-AFC: Effects of instructions and familiarization procedures on cognitive decision strategies

Title
Unspecified duo-trio tests can be as powerful as the specified 2-AFC: Effects of instructions and familiarization procedures on cognitive decision strategies
Authors
Shin, Hyun-KyungHautus, Michael J.Lee, Hye-Seong
Ewha Authors
이혜성
SCOPUS Author ID
이혜성scopus
Issue Date
2016
Journal Title
FOOD RESEARCH INTERNATIONAL
ISSN
0963-9969JCR Link1873-7145JCR Link
Citation
vol. 79, pp. 114 - 125
Keywords
Unspecified discrimination methodCognitive decision strategyConstant-reference duo-trio2-AFCROperational test power
Publisher
ELSEVIER SCIENCE BV
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
Using signal detection theory (SDT) and Thurstonian analysis, it has been possible in the food industry to make various business decisions such as reformulations and cost reductions based on the degree of consumer sensory discriminability by applying equivalence/difference testing. To achieve more efficient decision-making, it is important to investigate a theoretically and operationally more powerful consumer discrimination test method. Cognitive decision strategies used in discrimination methods largely determine relative test power and thus are of theoretical and practical significance. The goal of this study was to investigate if test procedures using a constant-ref. duo-trio design enable untrained/naive subjects to use a powerful 2-AFC strategy. Although previously the constant-ref. duo-trio design showed operational superiority to other unspecified test methods, the 'comparison of distance' (COD) strategy which is conventionally assumed for the duo-trio, lacks theorized power. The tested variables included two versions of duo-trio design, different familiarizations, instructions and experimental session designs. Three different iced tea samples were discriminated from a reference by 263 untrained/naive subjects using 5 different duo-trio test procedures. Results showed that untrained/naive subjects were able to perform the duo-trio with the reference presented twice, first and middle (DTFM) as a 2-AFC procedure, even with multiple pairs in a block design, after only two reference tastings with the information of the constant-reference. The duo-trio preceded by specified tetrad tests also showed potential as another efficient two-sequence test design. These results suggest that such constant-ref. duo-trio protocols using a 2-AFC strategy can be an alternative to the unspecified triangle and tetrad test. (C) 2015 Elsevier Ltd. All rights reserved.
DOI
10.1016/j.foodres.2015.10.012
Appears in Collections:
엘텍공과대학 > 식품공학전공 > Journal papers
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