Ideally, there is only one difference in the treatment of the control and experimental subjects. This treatment is called the independent variable. The independent variable in this week's lab was the application of norepinephrine (NE) to the medial hypothalamus. However, because of the experimental design, there were several differences in the control treatment and the experimental treatment. What was at least one of these differences and how would you redesign the experiment to eliminate this (these) problems?