Temporal dominance of sensations and dynamic liking evaluation of polenta sticks

Abstract

Purpose – Temporal dominance of sensation (TDS) is a sensory method developed by Pineau et al. (2003) which studies the sequence of dominant sensations of a product during its consumption. TDS is believed to be more appropriate to explain consumer responses than static descriptive analysis due to its temporal element. The purpose of this paper is to define the temporal sensory profile of a new product: polenta stick. In particular, TDS method was used to measure the dominance of sensory attributes in polenta stick samples and dynamic consumer tests were performed in order to verify if the acceptability changed over time during sample consumption. Design/methodology/approach – Eight polenta sticks, different in terms of storage conditions, cooking procedures and serving temperatures, were analysed by means of TDS with 13 assessors. During two preliminary sessions, the attributes list, constituted by the nine most cited sensations, was generated. Five replications were carried out. In dynamic consumer tests, 50 subjects were asked to give their liking on a seven-category scale for the frozen samples, in different five moments during the evaluation. Findings – TDS results showed a significant effect of the experimental conditions on dominant attribute perception of polenta sticks. For the oven-cooked samples, more flavour attributes were perceived as dominant, whereas for the fried samples, the attributes crispness and oiliness overcame with a high panel dominance rate and for a long time. For the chilled samples, crispness had the highest panel dominance rate; whereas for the frozen samples, creaminess was the most dominant attribute. Consumer liking scores did not significantly change over time during consumption for all the samples. The fried samples received the highest liking scores, at both serving temperatures. Practical implications – The chosen sensory methods gave the authors important information about the real perception of the products during consumption. A lot of foodstuffs show several sensory properties that appear in different times during evaluation and/or consumption. These properties could affect overall liking so they should be taken into account. Originality/value – New dynamic sensory methods were used to characterize a new food product, i.e. polenta-based sticks. The procedure used to evaluate the liking by consumers was completely innovative, whereas the sensory method used to characterize the samples was recently developed. The new food product was developed as an aim of an Italian research project funded by MiSE (Ministero dello Sviluppo Economico) for the valorization of maize flour (MAISFOOD, Industria 2015).