An important case of the model is Case 5, in which the discriminal dispersions are specified to be uniform and uncorrelated.
2.
With this in mind, the specification of uniform discriminal dispersions is equivalent to the requirement of parallel Item Characteristic Curves ( ICCs ) in the Rasch model.
3.
Accordingly, from the point of view of Thurstone's approach, treating the JND as a unit is justifiable provided only that the discriminal dispersions are uniform for all stimuli considered in a given experimental context.
4.
In particular, Thurstone showed that if Fechner's law applies " and " the discriminal dispersions associated with stimuli are constant ( as in Case 5 of the LCJ outlined below ), then Weber's law will also be verified.
5.
The " discriminal dispersion " of a stimulus " i " is the dispersion of fluctuations of the " discriminal process " for a uniform repeated stimulus, denoted R _ i, where S _ i represents the " mode " of such values.
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