What is the term for an extra antecedent stimulus added to the environment to occasion a response?

The correct term for an extra antecedent stimulus added to the environment to occasion a response is a prompt. Prompts are used in behavior analysis to assist in guiding an individual toward the correct response when they may not be able to produce the desired behavior independently. This additional stimulus can be verbal, physical, visual, or tactile and is designed to increase the likelihood that the individual will engage in the target behavior.

By introducing a prompt, a trainer or teacher helps shape learning by providing just enough assistance for the individual to succeed and reinforcing that behavior, which can lead to increased independence over time as prompts are gradually faded out. This approach is critical in teaching and reinforcing new skills, making prompts a fundamental component of effective behavioral interventions.