Dr. Soreth is teaching a pigeon to peck a green button. First she reinforces the pigeon for turning toward the green button, then for approaching the button, and so on in very small steps. She does this until the pigeon is successfully and consistently pecking the button. What principle of learning is Dr. Soreth using

Shaping

Explanation:

Shaping also called successive approximation in the principle of learning is a method for directing and reinforcing an appropriate behavior which is geared at assisting the subject  in learning and improving  goals for desired behavior through constant guidance and direction until the subject achieves effectiveness in the certain behavior.

Shaping even though used as a tool for improving human behavior is commonly adopted in  training  animals to learn new tasks.

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