Echoic behavior is verbal behavior in which the response is vocal and controlled by a prior auditory verbal stimulus, there is point-to-point correspondence between the stimulus and the response, and there is formal similarity between the prior stimulus and the response-product.
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