SEQUENTIAL SENSITIVITY ANALYSIS FOR SAME–DIFFERENT TESTS: SOME FURTHER INSIGHTS

Authors


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Abstract

ABSTRACT

A Sequential Sensitivity Analysis was performed for same–different tests using low-concentration threshold NaCl solutions versus purified water. The order of favorability for the sequence pairs (W-S, W-W, S-S, S-W) was different from the order obtained in previous studies (W-S, S-W, W-W, S-W). In the current study, the order depended on the judge's ability to recognize perceptual changes; this could be said to involve a decision rule or cognitive strategy that used a τ criterion. In previous studies, the orders depended on the judges’ ability to recognize individual stimuli; this could be said to involve a decision rule that used a β criterion. Further insights into the interpretation of these orders were discussed.

PRACTICAL APPLICATIONS

Sequential Sensitivity Analysis provides a simple first-order ordinal model for predicting the sensitivity of difference tests, once suitable preliminary data have been obtained. This article provides new data that allow a fuller understanding of the sensory mechanisms involved in the model, which will improve the validity of predictions being made regarding difference test sensitivity.

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