Expanded Tables for Conversion of a Proportion of Correct Responses (P _c to the Measure of Sensory Difference ( <i>d′</i> ) for the Triangular Method and the 3‐Alternative Forced Choice Procedure

Abstract

ABSTRACT The Triangular Method differs from the 3‐Alternative Forced Choice Procedure with respect to the type of instructions and the design of the experimental procedure involved. Therefore the functional relationship between a proportion of correct responses (P C ) and the sensory discriminability between stimuli (expressed as d′) is not identical for the two procedures. This paper provides tables to enable easy and precise conversion of values of P C into values of d’for each of the procedures.