Power and Sensitivity of the Same‐different Test: Comparison With Triangle and Duo‐trio Methods

Same‐different, duo‐trio and triangle discrimination methods were compared using vanilla flavored yogurt with and without added sugar as the medium. Two experiments were performed, one in controlled laboratory conditions and the other in conditions approximating more to consumer testing. A modification of the same‐different test had greater power than the duo‐trio of triangle tests. At higher sugar concentrations, d’values for the three methods were equivalent. Yet, at lower sugar concentrations, the same‐different d’tended to be higher. The results are discussed in terms of Sequential Sensitivity Analysis, memory effects and changes between β and criteria.