TY - JOUR
T1 - Investigation of operationally more powerful duo-trio test protocols
T2 - Effects of different reference schemes
AU - Kim, Min A.
AU - Lee, Hye Seong
N1 - Funding Information:
The authors thank Dr. Michael J. Hautus and Dr. Rune Haubo Bojesen Christensen for their valuable comments and suggestions that helped improve the focus and readability of the paper. This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science, and Technology (No. 2009-0076537 ).
PY - 2012/9
Y1 - 2012/9
N2 - The effects of reference schemes (reference mode - constant vs. balanced-, number, position, and nature - stronger vs. weaker) on the performance of replicated duo-trio tests were investigated using four versions of duo-trio protocols (DTF, DTM, DTFR, and DTFM), using two different pairs of tomato juices with different sodium content. Examination of proportion of correct answers (Pc) and d' estimates indicated that when the cognitive strategy was fixed to the comparison of distances (COD) strategy, the constant-reference mode showed the superior test performance over the balanced-reference mode, only for DTFM performed using the stronger reference. Among the tests with the balanced-reference mode, for DTF, estimates of d' of the tests using the stronger-reference (W-odd) were significantly higher than tests using the weaker-reference (S-odd), whereas the opposite was true for DTM, revealing the operational influence of the reference position. In general, the DTF or DTFM using the stronger (saltier) product as a constant-reference is recommended as an operationally more powerful protocol to discriminate products having high sodium contents.
AB - The effects of reference schemes (reference mode - constant vs. balanced-, number, position, and nature - stronger vs. weaker) on the performance of replicated duo-trio tests were investigated using four versions of duo-trio protocols (DTF, DTM, DTFR, and DTFM), using two different pairs of tomato juices with different sodium content. Examination of proportion of correct answers (Pc) and d' estimates indicated that when the cognitive strategy was fixed to the comparison of distances (COD) strategy, the constant-reference mode showed the superior test performance over the balanced-reference mode, only for DTFM performed using the stronger reference. Among the tests with the balanced-reference mode, for DTF, estimates of d' of the tests using the stronger-reference (W-odd) were significantly higher than tests using the weaker-reference (S-odd), whereas the opposite was true for DTM, revealing the operational influence of the reference position. In general, the DTF or DTFM using the stronger (saltier) product as a constant-reference is recommended as an operationally more powerful protocol to discriminate products having high sodium contents.
KW - Duo-trio
KW - Reference scheme
KW - Sensory difference test
KW - Sequence effects
KW - Sodium reduction
KW - d'
UR - http://www.scopus.com/inward/record.url?scp=84858958410&partnerID=8YFLogxK
U2 - 10.1016/j.foodqual.2012.02.016
DO - 10.1016/j.foodqual.2012.02.016
M3 - Article
AN - SCOPUS:84858958410
VL - 25
SP - 183
EP - 191
JO - Food Quality and Preference
JF - Food Quality and Preference
SN - 0950-3293
IS - 2
ER -