People describe Sarah as peculiar. She mixes up random words from different languages and strings them together in rambling sentences. She plays out her fantasy of living in a world made of cotton candy all day. However, she does not suffer from hallucinations or delusions. Sarah is displaying symptoms of .

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?