Abstract: This research investigated new paradigms that permit the simultaneous comparison of more than two samples in a discrimination study. Three successive experiments were conducted. All involved noncarbonated orange beverages. In experiment I, Torgerson’s method of triads was found to be more discriminating than the multiple dual-pair method and was used in the subsequent...
Abstract: This research investigated the possibility of uncovering a relationship between the sensitivities of trained and consumer panels in three experiments. In Experiment I, five studies were conducted using vanilla flavored ice cream. In each study, two ice cream samples differing in formulation and/or their manufacturing process were used. They were compared by both...
Abstract: In order to provide insights into why discrimination protocols with three stimuli sometimes tend to be less sensitive than protocols with two stimuli, two experiments were conducted. In these experiments,the relative effects of memory decay and memory interference were investigated. Both experiments involved purified water and/or solutions of low NaCl concentration. In Experiment...
Abstract: Two experiments were conducted to investigate the suitability of the Thurstonian models for the 2-AFC (2-alternative forced choice) and 2-AC protocols (2-AFC test with a "no difference" option). The Thurstonian approach predicts that if the same subjects and products are used, the degree of difference measured between the products (d0) should be the...
Abstract: The present article provides an overview of our current knowledge on the topic of discrimination testing. First, the various goals of discrimination testing are outlined in terms of the objective of the investigation: psychophysics (understanding how the human senses work), Sensory Evaluation I (using the human senses as instruments to evaluate food characteristics)...
Abstract: The previous pages contain several well-written essays by the other contributors, based on their business and consulting experiences, on a wide range of topics related to product testing. Many of these essays deal with non-scientific issues in politics, management and history. Examples include discussions on turf battles between market research and sensory departments,...
Abstract: This article describes our current knowledge on the topic of sensory discrimination testing. The general objectives of the commonly called 'difference tests' are first emphasized, the main objective being the scaling of sensory magnitudes. Then, the traditionally encountered discrimination protocols are described in terms of the nature of the instructions given to the...
Abstract: Two experiments were conducted to investigate the sensitivity of four discrimination methods when they were performed by consumers. In Experiment I, the influence of memory in the duo-trio method was studied. Three versions of the duo-trio method with different memory requirements were considered. Calculated d0 values indicated a higher sensitivity for the duo-trio...
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...
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...