>> jamie: welcome back, everybody. we've been talking a lot about what happened in boston and obviously so many people were affected, but think about this. there were also other scaries this week. ricin sent to capitol hill members and the president and also that explosion in texas, so many were injured or lost their lives. i want to ask the doctor about some of the therapies. you've encouraged people to get help, there are hotline, but what about treatments? dr. samadi. >> the best way to deal with ptsd is cognitive behavior or therapy. it's a lot of words about having your psychologists and psychiatrists who sit with you and try it change the way you feel, the way th you think. some of the new technologies i like is this virtual realities where we take you to the lab and you're actually watching the video of this scene and slowly monitoring your heart rate, your blood pressure, and over time, that's the word that you use, it's to desensitize you to that