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S

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An event in the presence of which a target behavior is not reinforced. (Pronounced "ess-delta.") See discriminative stimulus.
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See Discriminative stimuli. 15
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See Discriminative stimuli. 16, 25
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A stimulus designated to become a discriminative stimulus. 15
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("S-dee"). Positive or discriminative stimulus; S -, SA ("S-delta"). Negative stimulus. See DISCRIMINATIVE STIMULUS.
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See Conditioned reinforcer; Positive reinforcer; Reinforcement. 9
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A stimulus not to function as an SD, but as an Sl or SD-. 15
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A stimulus in the presence of which a particular response will not be reinforced or punished.
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An S-delta represents the particular occasion on which a performance will not be reinforced, in contrast to other occasions (discriminative stimuli) during which the performance will be reinforced.
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When an operant does not produce reinforcement, the stimulus that precedes the response is called an S-delta (S^). In the presence of an S-delta, the probability of emitting an operant declines.

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