What is the earliest form of intraverbal training?

The correct answer is responding to questions. This form of intraverbal training involves teaching individuals to answer questions, which helps them to develop their ability to engage in verbal behaviors that are not directly related to the immediate environment or stimuli. By responding to questions, learners practice generating language in a way that is functional and appropriate in various social contexts.

Engaging in conversations and repeating phrases may come later in the process of language development and intraverbal training, as these skills often build upon the foundational ability to respond to direct queries. Not responding to one’s name, while related to social interaction, does not exemplify the concept of intraverbal training, as it does not involve the generation of verbal responses to questions or prompts.