Cueing is a function of mental recall or information retrieval.
Recall comes in 3 types; free recall, cued recall, and serial recall. Cued recall, or cueing, is the action of giving a clue or prompt to another person in order to receive a reaction.
For example, in acting, this is the action of reminding an actor of their lines by feeding them the first few words in the sentence to prompt their recall. This is essentially a retrieval cue. In psychology it can be the act of providing a test subject, either human or animal, with a signal to act. For instance, when dealing with an animal test subject this might be sounding a bell or buzzer to get a reaction such as signifying that food is available.