By pairing the ringing of a bell with the presentation of meat, Pavlov trained dogs to salivate to the sound of a bell even when no meat was presented. In this experiment, salivation to the meat was the ______

The prevalence of PTSD among U.S. soldiers who served in the Vietnam War is about one

in ______. a. two c. four b. three d. five

Drug treatment for borderline personality disorder

a) has been shown to be ineffective for treating the symptoms of the disorder. b) must be conducted with weekly consultations from a neurologist. c) must be done with care as people with the disorder often abuse drugs. d) has been researched too little to make any general statements.