Upon Further Reflection. Chapter 6: The Evolution of Verbal Behavior. Quote 15

“There are two types of mand. Pull is an action-mand, reinforced when the listener does something . . . An object-mand is more likely to occur in the presence of the object, because it has more often been reinforced in the presence of that object. We are much more likely to ask for the tings we see in a shop because asking for presently available objects has more often been reinforced.” (p. 84)