Multidimensional extension of the mixed assessor model

International audience

Maternal weaning practices and their impact on infant's acceptance of new food

Objective. The introduction of solid foods is a major step in the development of food behaviour. Previous studies showed that higher sensory variety in weaning period can later influence infant's acceptance of new food. The aim of the present study is (i) to describe precisely the different maternal weaning practices, (ii) to relate them with the individual mothers' and infants' characteristics, (iii) to study if these practices could impact infant's acceptance of new foods. Methods. Mothers (n=121) were requested to record each food proposed to their infant detailed from a sensory point of view and to score the level of its acceptance at the 4 first presentations. The beginning of the wean…

Périurbanisation, ségrégation sociale et accès aux services publics

L'objectif de ce rapport est, d'une part, de mesurer la ségrégation à l'échelle des aires urbaines françaises et de tester l'hypothèse selon laquelle le mouvement de périurbanisation, touchant plus particulièrement les familles de classes moyennes, entraîne une bipolarisation accrue dans les pôles urbains, et, d'autre part, d'évaluer dans quelles mesures l'offre de services publics suivant les mouvements de populations renforce la ségrégation en y ajoutant une dimension supplémentaire en termes d'accessibilité à ceux-ci. Nous avons ainsi pu montrer qu'effectivement la périurbanisation de certaines catégories sociales, les catégories intermédiaires en 1990 et les cadres en 1999, tend à renfo…

Multi-bites or multi-sips TDS with untrained subjects: A live demonstration on chocolates

Workshop ; page d'accueil : http://www.pangborn2013.com/

Modeling TDS data and segmenting consumers thanks to a mixture of semi-Markov processes

International audience

The TDS-bands plot: a new graphical tool for Temporal Dominance of Sensations data

A path analysis model: how liking for vegetables emerges in children

A path analysis model is used to explain how preference for vegetables emerges before 2 years. It takes into account several determinants such as the child exposition, the child preferences for odors and flavors, as well as the parental behavior.

Multiplicative decomposition of the scaling effect in the Mixed Assessor Model into a descriptor-specific and an overall coefficients

Abstract In 1994, Brockhoff and Skovgaard presented the so-called assessor model, including a “scaling coefficient” expressing the predisposition of a panelist to spread more or less his scores than the panel on a given sensory descriptor. This paper discusses potential scaling causes, and then proposes a decomposition of the scaling coefficient into two components: (i) an overall scaling coefficient, independent of the descriptors, expressing a psychological trend of the panelist towards the scoring task in general; (ii) a corrected scaling coefficient for each descriptor, expressing specific sensitivity of the panelist to the descriptor. Applied to 187 sensory datasets, this decomposition…

Collecting and analysing in vivo aroma release and perception by pairing nosespace PTR-ToF-MS and Temporal Dominance of Sensations

Développement des préférences pour les légumes dans la cohorte OPALINE : un modèle SEM pour intégrer les différents déterminants des préférences de la période intra utérine à l'âge de 2 ans (SESSION 1 : Comportement du consommateur : analyse et modélisation)

Présentation orale ; https://intranet.inra.fr/alimh/vie_scientifique/did_it/seminaire_modelisation

Monitoring panel performances with the Mixed Assessor Model. Meta-analysis of the SensoBase

Monitoring panel performances with the Mixed Assessor Model. Meta-analysis of the SensoBase. The 11. Sensometrics meeting

Creation of a food taste database using an in-home "taste" profile method

International audience; The purpose of this study was to create a food 'taste' database using an innovative in-home profile method. The five basic tastes and fat sensation were studied. The proposed method consisted in an intensive training in laboratory (55 h, 5 months) immediately followed by an in-home measurements phase (8 months) during which 12 trained panelists had to evaluate the five tastes and fat sensation of the foods they typically consumed. The rating scales were inspired by scales used in the Spectrum (TM) method. During the in-home measurement phase, ratings were reported thanks to a web-based tool and each month the panelists returned to the laboratory for a 2-h retraining …

Complementary feeding: what, when and how in OPALINE mothers? Consequences on infant's food acceptance.

National audience; The introduction of weaning foods is a major transition in the development of infants’ eating behavior. Previous studies showed that greater variety at the beginning of the weaning period can later influence an infant’s acceptance of new foods. The aim of the present study was to describe maternal feeding practices in the first year (breastfeeding duration, age at the initiation of weaning, variety of new foods introduced) and to study whether they impacted infants’ later acceptance of new foods in a longitudinal survey of French children’s eating behavior. Mothers (n = 203) were asked to record each food offered to their infants from the beginning of the weaning period t…

Maternal feeding practices during the first year and their impact on infants' acceptance of complementary food.

Funding: Regional Council of Burgundy + Regional Council of IFR92 + Regional Council of PRNH-INRA-INSERM + Regional Council of the "ANR The French National Research Agency" under the Programme National de Recherche en Alimentation et nutrition humaine (ANR-06-PNRA-028 ) + Regional Council of Bledina, Nestle, Symrise, Cedus and Valrhona; International audience; The introduction of weaning foods is a major transition in the development of infants' eating behavior. Previous studies showed that greater variety at the beginning of the weaning period can later influence an infant's acceptance of new foods. The aim of the present study was to describe maternal feeding practices in the first year (…

TimeSens - un logiciel Web pour l'acquisition et le traitement des données sensorielles

TimeSens est un nouveau logiciel dédié à l'acquisition et au traitement des données d'analyse sensorielle. TimeSens bénéficie de l'expérience et de l'expertise de ChemoSens, la plate-forme d'analyse sensorielle du CSGA. TimeSenspropose la plupart des protocoles standards de l'analyse sensorielle (profil, tests hédoniques, DTS), ainsi que des protocoles originaux (MATI, PSP). Les résultats collectés peuvent être analysés à l'aide de méthodes statistiques traditionnelles ou innovantes.

The effect of gender, age and smoking status on use of scale, repeatability, product discrimination and agreement with the panel investigated in 177 descriptive sensory studies

The effect of gender, age and smoking status on use of scale, repeatability, product discrimination and agreement with the panel investigated in 177 descriptive sensory studies. 11. Pangborn sensory science symposium

Indexes of individual and panel performances in TDS and TCATA and their statistical inference

International audience

Should I replace replicates by additional subjects in my trained descriptive sensory panel?

Should I replace replicates by additional subjects in my trained descriptive sensory panel?. 11. Pangborn sensory science symposium

A multiple-response chi-square framework for the analysis of Free-Comment and Check-All-That-Apply data

International audience; Free-Comment (FC) and Check-All-That-Apply (CATA) provide a contingency table containing citation counts of descriptors by products. The analyses performed on this table are most often related to the chi-square statistic. However, such practices are not well suited because they consider experimental units as being the citations (one descriptor for one product by one subject) while the evaluations (vector of citations for one product by one subject) should be considered instead. This results in incorrect expected frequencies under the null hypothesis of independence between products and descriptors and thus in an incorrect chi-square statistic. Thus, analyses related …

Time periods segmentation in TDS and TCATA

International audience

The subject effect in descriptive analysis: fixed or random? An old question revisited thanks to 697 datasets from the sensobase

The subject effect in descriptive analysis: fixed or random? An old question revisited thanks to 697 datasets from the sensobase. 11. Pangborn sensory science symposium

Utilisation de la Dominance temporelle des sensations pour la caractérisation sensorielle des produits de la filière blé-farine-pain

Eurogerm is specialized in flour correctors, bread improvers and technological ingredients for the wheat, flour and bread sector. The company gives great importance to sensory analysis as a diagnostic tool of finished products and has four expert panels; each panel is specialized in one category of products and is trained to standard sensory profiling. Today, in addition to the traditional method, Eurogerm wants to explore new methods in order to offer new services to its customers. This paper describes the development of Temporal Dominance of Sensations (TDS) created in the “Centre des Sciences du Goût et de l’Alimentation” (CSGA) (PINEAU et al., 2009). TDS provides information on the perc…

Sensory evaluation with consumers revisited thanks to Free-Comment

International audience

Should I use touchscreen tablets rather than computers and mice in TDS trials?

International audience; Internet technologies are increasingly used as tools in sensory analysis. Thus, it would be a natural step forward for sensory science to move beyond the laboratory, into people's homes. Therefore, working with consumer IT devices like touchscreen tablets in sensory science should be taken into consideration. Working with the intuitive concept of dominance, Temporal Dominance of Sensations (TDS) requires a non-analytical answer from the subject. Using a touchscreen tablet instead of a classic mouse could reduce the cognitive load and favor a more instinctive answer. Indeed, it was proven that touch interaction is natural and efficient, and that finger pointing is fas…

Temporal drivers of liking

Abstract Generally liking is measured overall but is likely to vary over the food intake, like sensory perception. Replacing the attributes in Temporal Dominance of Sensations (TDS) by the categories of a usual ordinal liking scale makes it possible to monitor liking changes while eating a product (Sudre et al., 2012). This methodology allows for a better understanding of the influence of temporal dominance of sensations on liking and liking evolution over the time of product intake. Thus, it is possible to associate hedonic temporal data and descriptive temporal data (TDS profiles), which would identify drivers of liking, that is attributes which, when cited as dominant, would lead to a de…

Peri-urban development, residential segregation and access to public service

Plan Urbanisme Construction Architecture (PUCA) ; Ministère de l'écologie, du développement et de l'aménagement durables; National audience; L'objectif de ce rapport est, d'une part, de mesurer la ségrégation à l'échelle des aires urbaines françaises et de tester l'hypothèse selon laquelle le mouvement de périurbanisation, touchant plus particulièrement les familles de classes moyennes, entraîne une bipolarisation accrue dans les pôles urbains, et, d'autre part, d'évaluer dans quelles mesures l'offre de services publics suivant les mouvements de populations renforce la ségrégation en y ajoutant une dimension supplémentaire en termes d'accessibilité à ceux-ci. Nous avons ainsi pu montrer qu'…

Attack-Evolution-Finish: a new method allowing for temporal product description thanks to Free-Comment with consumers

Eating chocolate, smelling perfume or watching video advertisement: Does it make any difference on emotional states measured at home using facial expressions?

Type d'article : méthodologie, recherche et revue.; International audience; The recording of facial expressions allows for implicit measurement of emotional states over time. The present study investigated whether these recordings can be acquired, using computer webcams, when testing products at home. Three types of product spaces (chocolates, perfumes and video advertisements) were evaluated at home by 44 subjects using a facial expression measurement protocol. Each product space was composed of three products. The first objective examined the feasibility of such a home-based protocol. The second objective investigated whether several products in the same product space could be characteriz…

Food preferences for fat and sweet: Insights from an exploratory study including 696 consumers from 7 to 80 years old

International audience

Description of maternal feeding practices and their impact on infant’s acceptance of new foods

International audience

Free comment using speech recognition: an alternative to Check-All-That-Apply for sensory characterization of red wines at home

International audience

Site internet du projet Prefbase (www.prefbase.fr)

Comparison of canonical variate analysis and principal component analysis on 422 descriptive sensory studies

International audience; Although Principal Component Analysis (PCA) of product mean scores is most often used to generate a product map from sensory profiling data, it does not take into account variance of product mean scores due to individual variability. Canonical Variate Analysis (CVA) of the product effect in the two-way (product and subject) multivariate ANOVA model is the natural extension of the classical univariate approach consisting of ANOVAs of every attribute. CVA generates successive components maximizing the ANOVA F-criterion. Thus, CVA is theoretically more adapted than PCA to represent sensory data. However, CVA requires a matrix inversion which can result in computing inst…

TimeSens, a Web-based sensory software for Temporal Dominance of Sensations

TimeSens, a Web-based sensory software for Temporal Dominance of Sensations. 9. Pangborn sensory science symposium

Estimating finite mixtures of semi-Markov chains: an application to the segmentation of temporal sensory data

Summary In food science, it is of great interest to obtain information about the temporal perception of aliments to create new products, to modify existing products or more generally to understand the mechanisms of perception. Temporal dominance of sensations is a technique to measure temporal perception which consists in choosing sequentially attributes describing a food product over tasting. This work introduces new statistical models based on finite mixtures of semi-Markov chains to describe data collected with the temporal dominance of sensations protocol, allowing different temporal perceptions for a same product within a population. The identifiability of the parameters of such mixtur…

The MAM-CAP table: A new tool for monitoring panel performances

Abstract Assessor performances in sensory analysis are usually represented by three indicators: repeatability, discrimination and agreement. However, assessors can also differ on the range of their scores, the so-called “scaling effect”. Brockhoff, Schlich, and Skovgaard (2013) proposed the mixed assessor model (MAM) which, as the original assessor model ( Brockhoff & Skovgaard, 1994 ), takes this effect into account, but also allows for the product effect to be tested against a new interaction free of the scaling effect. The present paper proposes a unified system for monitoring assessor and panel performances based on the MAM. In addition to the product effect (tested at panel and individ…

Oral sphere: salivary markers and food. A prospective study on children expressing oral disorders

National audience

Having cheese with wine… always a good idea! A sensory proof based on the use of Temporal Dominance of Sensations (TDS)

Having cheese with wine… always a good idea! A sensory proof based on the use of Temporal Dominance of Sensations (TDS). Oenométrie XXIII

Canonical Variate Analysis of Sensory Profiling Data

Principal Component Analysis (PCA) of product mean scores is generally used to obtain a product map from sensory profiling data. However, this approach does not take into account the variance of the product mean scores due to the individual panelist variability. Therefore, Canonical Variate Analysis (CVA) of the product effect in the two-way multivariate analysis of variance (MANOVA) should be considered as a natural alternative analysis to PCA. Indeed, it is the extension of the classical univariate approach used for the analysis of each descriptor separately. This analysis generates successive components maximizing product discrimination as measured by the usual Fisher statistics in analy…

Static vs. dynamic liking in chewing gum: a new approach using a background task and a natural setting

Fil: Galmarini, Mara Virginia. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Galmarini, Mara Virginia. Pontificia Universidad Católica Argentina. Facultad de Ciencias Agrarias; Argentina Fil: Symoneaux, R. Universidad de Nantes Angers Le Mans; Francia Fil: Visalli, Michel. Centro de Ciencias de los Alimentos y el Sabor; Francia Fil: Zamora, María Clara. Pontificia Universidad Católica Argentina. Facultad de Ciencias Agrarias; Argentina Fil: Zamora, María Clara. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Schlich, Pascal. Centro de Ciencias de los Alimentos y el Sabor; Francia Abstract: Chewing gum is a particular product, consumed …

Evaluation of the validity of temporal sensory evaluation methods carried out by consumers on controlled stimuli delivered by a gustometer

Temporal sensory evaluation is increasingly used with consumers. However, very few studies have investigated the repeatability and resolution of the methods used. Thus, this study aimed to fill in the gap by comparing the conclusions drawn from data collected using three temporal sensory methods performed with consumers on time model solutions delivered using a gustometer. One hundred and fifty consumers were recruited. After familiarization and a recognition task, they were divided into 3 panels, each using a different method to describe their temporal perception: Temporal Dominance of Sensations (TDS), Temporal Check-All-That-Apply (TCATA), and Attack-Evolution-Finish (AEF). Fourteen solu…

Modeling temporal dominance of sensations data with stochastic processes

National audience

Description of maternal feeding practices and their impact on infant's acceptance of new foods

International audience

Creation of a food taste database using an in-home profile method

Poster (1 page) ; http://www.pangborn2013.com/; International audience; The purpose of this study was to create a food taste database using an innovative in-home profile method and to have an overview on the sensory sapid world we face in our diet. The intensity of salty, sweet, acid and bitter tastes were scored using universal scales proposed within the Spectrum™ method (Muñoz and Civille, 1992) and newly developed scales for umami taste and fattiness. The in-home taste profile method was composed of two phases. The first phase consisted in an intensive training in laboratory (55 h). The second one was the in-home measurements phase (8 months) during which 12 panellists had to rate the ta…