Once a response has been reinforced in the presence of a stimulus, the process of extension is not required to explain the occurrence of the same response in the presence of that stimulus at some point in the future. Extension requires a novel stimulus; therefore, if the child sees the same chihuahua the next day and again says “dog,” that is not generic extension because the stimulus is no longer novel.
An instance of verbal behavior with the following features:
The response form must be a previously learned one
The stimulus must be novel
The novel stimulus must have all of the relevant features of the stimulus that previously controlled the response
The type of elementary verbal relationship between the stimulus and the response
Formal and dynamic characteristics of the response
Formal or dynamic characteristics of the stimulus
Whether or not the current response is followed by reinforcement