Approximately __________ percent of doctor visits are the result of complaints by individuals who are worried that something is seriously wrong, even though no medical cause is found to explain their symptoms.

Which of the following is a primary reason for the lowered brain volume of older adults compared with that of younger adults?

lower number of neurons increased length and complexity of axons lower numbers of synapses increased growth of dendrites

Rob presented at the clinic with complaints that he is terrified to go anywhere that does not have a bathroom for fear that he will begin vomiting and not be able to stop. He has had one panic attack and reported that a week after that attack, he felt no residual effects from it. Rob would most likely receive a DSM-IV diagnosis of

a. panic disorder with agoraphobia. b. panic disorder without agoraphobia. c. interoceptive agoraphobia. d. agoraphobia without history of panic disorder.