THE EFFECT OF A REMINDER STIMULUS ON THE DECISION STRATEGY ADOPTED IN THE TWO-ALTERNATIVE FORCED-CHOICE PROCEDURE

  • Michael J. Hautus
  • Daniel Shepherd
  • Mei Peng

Abstract

The decision strategy adopted by an observer in a psychophysical task may be established bycomparing estimates of sensitivity obtained by using detection-theoretic models that assumethe various available decision strategies. The performance of ten observers on an auditorylevel discrimination task using the yes-no, two alternative forced choice (2AFC), and 2AFCwith reminder (2AFCR; sometimes called duo-trio) procedures was compared to determinethe decision strategy used in the 2AFCR procedure. This procedure permits at least threedecision strategies: differencing, likelihood ratio, and comparison of distances. The latterstrategy has been frequently assumed in the analysis of duo-trio data in the sensoryevaluation literature. The current study demonstrates that the comparison of distancesstrategy was not used by nine of the ten observers.
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