The evolution of a model: A review of Thurstonian and conditional stimulus effects on difference testing

Difference test sensitivity: Comparison of three versions of the duo–trio method requiring different memory schemes and taste sequences

“…However, these were the only sequences that they used, so bad sequences do not explain the differences between the present study and that of Rousseau et al The two studies used different stimuli. It may be hypothesized that judges would be more familiar with changes due to sugar concentration in orange flavored drinks than with the various taste changes due to NaCl concentration in saline solutions (Lee & O'Mahony, 2007a). Further it may be hypothesized that the above response bias would be less effective with more familiar stimuli.…”

“…This has been described by the Sequential Sensitivity Analysis (SSA) model (Lee & O'Mahony, 2007a;O'Mahony & Odbert, 1985) as well as conditional stimulus model (Ennis & O'Mahony, 1995). The SSA model predicts for a distilled water/low concentration NaCl system that a duo-trio with a weaker (water) reference (S-odd) would give superior performance to one with a stronger (NaCl) reference (W-odd) (O'Mahony & Odbert, 1985).…”

Discriminations of the A–Not A difference test improved when “A” was familiarized using a brand image

“…The second reason was that for the 2-AFCR tests to be performed in a stable manner, it was considered to be important for subjects to have a stable memory of the sensory perception of the reference. Yet, it is well known that each momentary perception of the reference is not exactly same all the time (Lee & O'Mahony, 2007;Macmillan & Creelman, 2005). Thus in order to reduce the perceptual variance within the reference product, it was thought that it was more appropriate to introduce the reference twice before the 2-AFCR task.…”

“…Used in Signal Detection Theory and Thurstonian modeling, d 0 estimates are a sensitivity index (Lee & O'Mahony, 2007;Macmillan & Creelman, 2005). In recent studies, d 0 estimate comparisons from various types of difference test designs have been employed using the same subjects and stimuli to determine the most sensitive sensory difference test design .…”

Investigation of operationally more powerful duo-trio test protocols: Effects of different reference schemes

“…In signal detection theory and Thurstonian modeling context (Lee & O'Mahony, 2004, 2007, one index that reflects the true sensory difference between stimuli is d 0 . For the comparisons across the various versions of the duo-trio, when the same cognitive decision process can be assumed, this d 0 can also be used as an index for test performance.…”