This question is purely definitional-- prodigies are people of normal intelligence who have an extraordinary talent and savants are people of low intelligence who have an extraordinary talent.

Cognitive dissonance is not a persuasion technique; it describes the discomfort people face when they realize their own inconsistent beliefs. 

The norm of reciprocity, the door in the face technique, the foot in the door technique, and heuristic persuasion are all methods of persuasion—or are clearly related to methods of persuasion. The norm of reciprocity is the idea that someone will tend to reciprocate favors with favors or hostility with hostility; in terms of persuasion, reminding someone that they owe you a favor can persuade them to do something for you. The door in the face technique is the idea that if you ask for something bigger than what you want and they refuse, you can ask for (and get) the smaller thing that you really want. The foot in the door technique is the idea that if you ask for something smaller than what you want and they agree, you can then ask for (and get) the bigger thing that you really want. Last, heuristic persuasion is persuasion based on habit or emotion.

The norm of reciprocity, the door in the face technique, the foot in the door technique, and heuristic persuasion are all methods of persuasion—or are clearly related to methods of persuasion. 

The foot in the door technique is the idea that if you ask for something smaller than what you want and they agree, you can then ask for (and get) the bigger thing that you really want.

The norm of reciprocity is the idea that someone will tend to reciprocate favors with favors or hostility with hostility; in terms of persuasion, reminding someone that they owe you a favor can persuade them to do something for you. Heuristic persuasion is persuasion based on habit or emotion. Last, cognitive dissonance is not a persuasion technique; it describes the discomfort people face when they realize their own inconsistent beliefs. 

The norm of reciprocity, the door in the face technique, the foot in the door technique, and heuristic persuasion are all methods of persuasion—or are clearly related to methods of persuasion. 

The norm of reciprocity is the idea that someone will tend to reciprocate favors with favors or hostility with hostility (e.g. reminding someone that they owe you a favor can persuade them to do something for you).

The door in the face technique is the idea that if you ask for something bigger than what you want and they refuse, you can ask for (and get) the smaller thing that you really want. The foot in the door technique is the idea that if you ask for something smaller than what you want and they agree, you can then ask for (and get) the bigger thing that you really want. Heuristic persuasion is persuasion based on habit or emotion. Last, cognitive dissonance is not a persuasion technique; it describes the discomfort people face when they realize their own inconsistent beliefs. 

The norm of reciprocity, the door in the face technique, the foot in the door technique, and heuristic persuasion are all methods of persuasion—or are clearly related to methods of persuasion. 

The foot in the door technique is the idea that if you ask for something smaller than what you want and they agree, you can then ask for (and get) the bigger thing that you really want.

The door in the face technique is the idea that if you ask for something bigger than what you want and they refuse, you can ask for (and get) the smaller thing that you really want. The norm of reciprocity is the idea that someone will tend to reciprocate favors with favors or hostility with hostility; in terms of persuasion, reminding someone that they owe you a favor can persuade them to do something for you. Heuristic persuasion is persuasion based on habit or emotion. Last, cognitive dissonance is not a persuasion technique; it describes the discomfort people face when they realize their own inconsistent beliefs.