Taste discrimination by the 3-AFC method: Testing sensitivity predictions regarding particular tasting sequences based on the sequential sensitivity analysis model
Jm. Dessirier et al., Taste discrimination by the 3-AFC method: Testing sensitivity predictions regarding particular tasting sequences based on the sequential sensitivity analysis model, J SENS STUD, 14(3), 1999, pp. 271-287
3-AFC discrimination tests between 'threshold' concentration NaCl solutions
and purified water stimuli were performed using a variety of interstimulus
rinsing regimes to test predictions of test sensitivity based on the Seque
ntial Sensitivity Analysis model. Superior performance on triads with NaCl
as the 'odd' stimulus, over triads with water as the 'odd' stimulus, confir
med earlier research. It was possible, using SSA predictions, to find the r
ight combination of rinses, to arrange for either set of triads to elicit s
trongly superior performance from judges. This manipulation was predicted b
y SSA but not by an unequal variance Thurstonian model. Failure of some SSA
predictions highlighted the notion of stimulus enhancement by adaptation,
leading to a modification of the model. Such manipulation of interstimulus
rinses could form the basis for increasing or decreasing test sensitivity.