Decision strategies for the A Not-A, 2AFC and 2AFC-reminder tasks: Empirical tests
The decision strategy adopted by an observerin a psychophysical procedure may be established bycomparing estimates of sensitivity obtained by usingdetection-theoretic models based on each of the availabledecision strategies. Estimates of sensitivity obtained from10 observers on auditory-level discrimination tasks usingthe yes/no, two-alternative forced choice (2AFC), and2AFC with reminder (2AFCR; sometimes called duo–trio)procedures were compared in order to determine thedecision strategy used by the judges in the 2AFCRprocedure. 2AFCR permits at least three decisionstrategies: differencing, likelihood ratio, and comparisonof distances. The latter strategy has frequently beenassumed in the analysis of duo–trio data in the sensoryevaluation literature. The present study demonstrates thatthe comparison-of-distances strategy was not used by 9of the 10 observers in this auditory experiment. Thenature of the instructions given to the observers had nomeasurable impact on the decision strategy that theyadopted.
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|Authors:||Hautus, MJ ; Shepherd, D ; Peng, M|
|Type of publication:||Article|
Food Quality and Preference
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