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What does SD stand for?

SD stands for Discriminative Stimulus

This definition appears very rarely and is found in the following Acronym Finder categories:

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We have 158 other meanings of SD in our Acronym Attic

Samples in periodicals archive:

Specifically, if the mechanism underlying the cognitive dissonance effect is contrast, it suggests that any reinforcer that is preceded by a relatively aversive event should result in positive contrast; and positive contrast should give additional value to the reinforcer that follows (or to the discriminative stimulus that signals the reinforcer).
The availability of reinforcement is contingent upon the presence of some discriminative stimulus of which reinforcement has been paired.