2000-2004

Journal Article: Investigation of potential taste reduction of catechin and grape seed dimeric phenols in water by wine proteins (2002)

Abstract: Soluble glycoproteins were isolated from Semillon wines made over a 5-y period, from 1990 to 1994, by precipitation with ammonium sulfate and fractionated by chromatography on Sephadex G-100. The total phenols were extracted with 50% aqueous ethanol from Semillon seeds, and the four seed phenol fractions (catechins, dimeric phenols, and oligomeric and polymeric...

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Journal Article: Statistical models for the A-Not A method (2001)

Abstract: Dependence among responses in using the A-Not A or “Yes-No” task are accounted for in new hypothesis testing models. The new models involve adjustments to Pearson’s and McNemar’s chi-square statistics and to the variance of d‘, a measure of signal detectability or sensitivity. This article appears as: Bi, J. and Ennis, D. M....

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Journal Article: The power of the “A”-”Not A” method (2001)

Abstract: The “A’“- Not A” method is a rating method with two categories. It is often treated as a discrimination method. Unlike forced choice procedures, the Thurstonian model for this method involves a choice criterion. In statistical tests, it is treated as a comparison of two proponions. In this paper, the power for hypothesis...

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Journal Article: Les biais de réponse dans le cadre d’analyses discriminatives (2001)

Abstract: Que ce soit dans le domaine de la recherche et développement, du contrôle qualité ou d’études hédoniques, il est extrêmement fréquent de mener des tests dans le but de déterminer la similarité ou la différence entre deux produits aux qualités sensorielles très proches. Par exemple, on peut étudier l’effet d’un nouvel ingrédient sur...

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Journal Article: Molecular mixture models: Connecting molecular events to perception (2001)

Abstract: Molecular mixture models are discussed that connect events at the periphery to taste perception. Application of the models to mixtures of glucose and hctose shows evidence for the existence of a transducer in human sweet taste and provides an hypothesis to explain the superior sweetening power of fructose to glucose. These mathematical models...

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Journal Article: A Thurstonian model for the dual pair (4IAX) discrimination method (2001)

Abstract: In the dual pair method, the subject is presented with two stimuli in two pairs: One pair is composed of two samples of the same stimulus; the other pair is composed of two samples of different stimuli, one being the same as that in the identical pair. The task of the judge is...

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Journal Article: The b-strategy: An alternative and powerful cognitive strategy when performing sensory discrimination tests (2001)

Abstract: For discrimination tests not requiring the nature of the difference to be specified in the instructions, such as the triangle, duo-trio and same-different protocols, it is usually assumed that the decision rule used by the subject in order to generate an answer involves the comparison of the relative sensory distances between the samples....

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Journal Article: Investigation of the dual-pair method as a possible alternative to the triangle and same-different tests (2001)

Abstract: Previous experiments have shown that the same-different test, because of its more suitable cognitive strategy and lower memory requirements, is a more powerful and sensitive alternative to the triangle and duo-trio tests. This project describes an experiment conducted in order to investigate ways to improve further the performance of the same-different test. Three...

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Journal Article: Exact beta-binomial tables for small experiments (2001)

Abstract: Exact tables calculated directly from the probability function of a betabinomial distribution are provided for replicated difference and preference tests. The tables can be used for small experiments when the numbers of replications and trials are not more than jive. This article appears as: Bi, J. and Ennis, D. M.(2001). Exact beta-binomial tables...

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Journal Article: Replicated difference and preference tests: How to account for inter-trial variation (2000)

Abstract: Binomial tests are often used in sensory difference and preference testing. Two assumptions underlie this use: (1) responses are independent and (2) choice probabilities do not vary from trial to trial. In many applications, the latter assumption is violated. In this paper we account for variation in inter-trial choice probabilities using the beta...

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