When the group of participants that is not receiving an intervention believed to be beneficial change their behavior so that they look just as good as the group receiving the intervention, this is known as

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Compensatory rivalry refers to members of the no-treatment group purposively changing their behavior so that their performance on the dependent variable actually improves.
Diffusion of treatment occurs when the independent variable is diffused or spread to the no-treatment group. Resentful demoralization is the effect when study participants who are not receiving the independent variable become demoralized to the extent that their performance on the dependent variable is affected.

When the Group of Participants That Is Not Receiving an Intervention