Kathy frequently makes faces at her classmates.Instead of punishing her for making faces,the teacher has the students totally ignore Kathy.This example illustrates the teacher's attempt at

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The teacher is using extinction, which involves ignoring behavior in order to decrease it. The teacher is not giving Kathy any attention for making faces, which will eventually cause her to stop making faces because she is no longer receiving any reinforcement for doing so.

Kathy Frequently Makes Faces at Her Classmates