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S : An event in the presence of which a target behavior is not reinforced. (Pronounced "ess-delta.") See discriminative stimulus.

S DELTA : See Discriminative stimuli. 15

S" : See Discriminative stimuli. 16, 25

S' : A stimulus designated to become a discriminative stimulus. 15

S+, SD : ("S-dee"). Positive or discriminative stimulus; S -, SA ("S-delta"). Negative stimulus. See DISCRIMINATIVE STIMULUS.

S, : See Conditioned reinforcer; Positive reinforcer; Reinforcement. 9

S- : A stimulus not to function as an SD, but as an Sl or SD-. 15

S-DELTA : A stimulus in the presence of which a particular response will not be reinforced or punished.

S-DELTA : 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.

S-DELTA : 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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