Which discrimination training type presents only one antecedent (SD or SΔ) in a given trial?

Which discrimination training type presents only one antecedent (SD or SΔ) in a given trial?

• A. Simultaneous discrimination
• B. Successive discrimination
• C. Nonexclusion discrimination
• D. Conditional discrimination

Answer: (B)

Successive discrimination presents only one antecedent in a given trial. Each trial includes either the discriminative stimulus (SD) or the nonreinforcing stimulus (SΔ), but not both, so the learner responds to that single cue and reinforcement depends on its presence or absence on that trial. This sequential setup contrasts with simultaneous discrimination, where SD and SΔ appear together in the same trial and the learner must choose between them. Conditional discrimination requires a specific relationship or context between stimuli to determine reinforcement, not a single cue per trial. Nonexclusion discrimination involves rules about reinforcement that don’t hinge on presenting just one antecedent per trial.

Successive discrimination presents only one antecedent in a given trial. Each trial includes either the discriminative stimulus (SD) or the nonreinforcing stimulus (SΔ), but not both, so the learner responds to that single cue and reinforcement depends on its presence or absence on that trial. This sequential setup contrasts with simultaneous discrimination, where SD and SΔ appear together in the same trial and the learner must choose between them. Conditional discrimination requires a specific relationship or context between stimuli to determine reinforcement, not a single cue per trial. Nonexclusion discrimination involves rules about reinforcement that don’t hinge on presenting just one antecedent per trial.