control group: my definition: the control group is the group in the experiment that is given no drug or a placebo. it will be used as a comparison.
"noun. (in an experiment or clinical trial)a group of subjects closely resembling the treatment group in many demographic variables but not receiving the active medication or factor under study and there by serving as a comparison group when treatment results are evaluated."
http://dictionary.reference.com/browse/control+group

external image ATIA_chart_2.jpg

http://www.nationaltechcenter.org/images/ATIA_chart_2.jpg




angela shen: The participants who do not engage in the behavior are the control group.

Control Group.gif