Mr. Lynch always uses his "mean" face to stop undesirable behaviour in his first-period class. However, even though he looks at Tommy with his mean face each time Tommy talks out of turn, Tommy is talking out of turn more and more frequently. For Tommy, the mean face is apparently a

Question

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The mean face is a positive reinforcer for Tommy because it is increasing the frequency of his talking out of turn, indicating that he finds it rewarding or reinforcing.

Mr Lynch Always Uses His "Mean" Face to Stop Undesirable