A common irrelevant feature may be the order of the words. You may have learned to say “reinforcement,” for example, as a function of hearing “a stimulus change which increases the probability of the response it follows.” Now someone says, “What do we call it when a response is followed by a stimulus change and the probability of that response occurring under similar circumstances in the future is increased?” Saying “reinforcement” after hearing that would be an example of generic extension.
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