Remember that it doesn’t matter whether the stimulus is written, printed, or typed because they all have approximately the same formal characteristics. Saying “KAJ” as a result of seeing “KAJ” is textual behavior because all of the defining features are present. The “meaningfulness” of the stimulus and response is irrelevant.
A form of verbal behavior with the following features:
The response is vocal
It is controlled by a prior stimulus that is the response-product of writing behavior
There is point-to-point correspondence between the stimulus and the response
The specific topography and dynamic characteristics of the vocal response
The specific form of the visual verbal stimulus (e.g., written, printed, or typed)
Formal and dynamic features of the response
Whether or not there is any reinforcement for the current response
The “meaning” of either the stimulus or the response