In the modern use of antidepressant medications, selective serotonin reuptake inhibitors tend to be the first "line of defense," particularly because they:

The social contact theory states that

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Martha participates in a research study in order to receive extra credit for her psychology class. when she arrives in the research office she is given a can of what looks and tastes like beer, but which actually contains no alcohol. in the adjoining room martha's classmate karen is also participating in the study. karen receives a can of alcoholic beer. if the experiment was designed to test the effects of alcohol on concentration, then who is exposed to the independent variable?