A stimulus in the presence of which a particular response will be reinforced.

• A. Discriminative Stimulus (SD)
• B. Prompt
• C. Error correction
• D. Incidental Teaching

Answer: (A)

Discriminative stimulus is a cue that signals reinforcement for a specific behavior. When this stimulus is present, the target response will be reinforced, so it sets the occasion for that behavior to occur. That exact idea—presence of the cue indicating that reinforcement is available for the response—matches what the item is asking about. A prompt is something used to help produce the response during learning, not the signal that reinforcement is available in the environment. Error correction is a procedure for addressing mistakes after they happen, and incidental teaching is a teaching method that uses natural opportunities; neither describes a stimulus that signals reinforcement.