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Adj.1.criterional - serving as a basis for evaluation
standard - established or well-known or widely recognized as a model of authority or excellence; "a standard reference work"; "the classical argument between free trade and protectionism"
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Harlow argued that animals that established learning sets were, in effect, learning how to learn the rules that provided for efficient responding during a two-choice discrimination task, where criterional performance on one pair of stimuli led to the introduction of two new stimuli, with each pair containing a randomly determined positive discriminative stimulus (S+) and negative discriminative stimulus (S-).
Stollnitz and Schrier presented either gradual spatial distancing between discriminanda and manipulanda or immediate 7-inch separation during a discrimination task, and they found that even animals starting with 7 and 18 inches of separation reached criterion (and were almost perfect for those five criterional sessions).
This interpretation of the use of multiple negative comparisons as irrelevant after criterional learning has already been achieved in conditional relations is consistent with recent findings on human subjects in the formation of equivalence relations (Adams et al.