When classifying echoic behavior, the formal and dynamic characteristics of the stimulus and the response are irrelevant, as is the “meaning” of either the stimulus or the response and whether or not the current response is reinforced.
A form of verbal behavior with the following features:
The response is vocal
It is controlled by a prior auditory verbal stimulus
There is point-to-point correspondence between the stimulus and the response
There is formal similarity between the prior stimulus and the response-product
Formal and dynamic characteristics of both the stimulus and the response
The “meaning” of either the stimulus or the response
Whether or not the current response is reinforced