If water is presented first, and then the word “water” is emitted, that is NOT mediated reinforcement because it lacks the first defining feature of the definition, and is probably an example of a type of discriminative stimulus that will be discussed later.
A stimulus change that has the following features:
It occurs after a response has been emitted
It increases the future probability of that response
It results from the action of another individual
Formal and dynamic features of the response
Formal and dynamic features of the controlling variable
Whether or not the current response is reinforced
The “meaning” of either the stimulus or the response