ABSTRACT
In this chapter the just noticeable difference (JND) and the JND increment are defined for arbitrary levels of detection certainty. The JND is a measure of the perceptual continuum; differences in JNDs are proportional to deviate values from a zero-mean difference distribution. A JND increment is the number of units of an objective metric or rating scale required to produce a sample difference of one JND. Both JNDs and JND increments are defined in terms of the results of paired comparison experiments.
