It is possible for there to be a great deal of formal similarity in the case of echoic behavior, and this is clearly the case with the skilled mimic, who not only says the “same thing,” but uses the same intonation and pitch as the original speaker.
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