lesson 6 pt. 3: sequential system approach in sensory evaluation

to find the most cost-effective and efficient method with which to obtain the most sensory information

the ultimate goal of a sensory program

Analytical sensory tests

Discrimination and descriptive methods

Hedonic tests

Methods which involve assessing consumer liking or preferences

the overriding principle of sensory evaluation

be able to match the sensory methodology with the objectives of the test

discriminative test

an overall difference test

descriptive test

analysis that answers the question “how are they different”

discrimination

type of class Screened for sensory acuity, oriented to test method, sometimes trained

descriptive

type of class Screened for sensory acuity & motivation, trained or highly trained

affective

type of class screened for product use, untrained

screen the samples

step in sensory study where “all the sensory properties

of the samples to be tested are tested”

design the test

steps in sensory study where there are:

○ Selection of the test technique

○ Selecting and training panelists

○ Designing the scoresheet

○ Specifying criteria for sample preparation

○ Determining ways in which data will be analyzed

Paired-comparison (or paired preference)

2 samples - Binomial distribution

duo-trio, triangle

3 (2 identical and 1, different) - Binomial distribution

ranking

2 - 7 —> Rank analysis Analysis of variance

Rating difference/ scalar difference from the control

1 - 18 samples - Analysis of variance, Rank analyis

threshold, dilution

5 - 15 —> Sequential analysis

attribute rating

1 - 18, Analysis of variance

1 - 18 Analysis of variance

1 - 18 → Analysis of variance

Food action

rating scale

1 - 18 (the larger number only if mild flavored or rated for

texture only)Analysis of variance Rank analysis