Three (or more) of the symptoms for major depressive episode have to be present during a two week period and represent a change from previous function in order to be diagnosed.

According to To Catch a Coldabout stress and the immune system, in the placebo group ______ of the

participants became infected or develop colds (a) 50% (b) 40% (c) 30% (d) 0%

Which parts of the brain lose cells in Huntington's disease?

a. Pathways of neurons containing the neurotransmitter dopamine b. The cerebellum and medulla c. The striatum and the cortex d. The hippocampus and amygdala