Buchanan, Tranel, and Kirschbaum (2009) compared three groups of participants, one of which had damage to the hippocampus, one that had similar brain damage but not to the hippocampus, and a control group of participants. The researchers assessed responses to the three groups both before and after they were exposed to stress. The hippocampus group showed less change in cortisol response to stress than the other two groups. What research design was used in this research?

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The research design used is a comparison group before-after because it involves comparing responses from different groups (one with hippocampus damage, one with other brain damage, and a control group) both before and after exposure to stress.

Buchanan, Tranel, and Kirschbaum (2009) Compared Three Groups of Participants