When classifying behavior as verbal or not, the following features are irrelevant: the topography of the behavior, the dynamic characteristics of the response, whether it is controlled by a verbal or non-verbal stimulus, the stimulus mode, and the reinforcement features (such as its schedule and whether it is conditioned or not).
Behavior that has the following features:
It is established and maintained by reinforcement
The reinforcement is mediated by another person
The other person’s action that results in reinforcement must have been specifically trained in order to reinforce speakers
The topography of the behavior: which muscles are used in making the response
Dynamic characteristics of the response: speed, intensity, repetition
Verbal or non-verbal stimulus
Stimulus mode: auditory, visual, etc.
Reinforcement features