This is an example of multiple responses in a tact relationship, but the same process also occurs in other elementary relationships. For example, the auditory stimulus “dog” may increase the likelihood of the echoic response “dog” or the intraverbal “cat” or the tact “common noun.”
A situation with the following features:
There is a single controlling variable
That controlling variable simultaneously strengthens two or more different response forms
The specific type of controlling variable
The number of response forms which are strengthened
The type of elementary verbal relationship