dr. nora volkov, the director of the national institute on drug abuse and you also conducted a study on cell phones. what was that study? >> the study was to find out if the human brain is sensitive to the signals sent by it sells phones. it they are of very low intensity. we have been provided with very inconclusive results. some show increases. some show no changes. there was a great deal of information. is the brain sensitive to elect dramatic -- electromagnetic radiation? >> so, if that was the question you're looking to answer, what is the answer? >> we found that after 50 minutes of exposure to a cell phone, the areas of the bring closest to the antenna showed increased consumption of glucose. glucose is the way the brain extracts energy in order to perform its functions. when you are activating an area of the brain, you see an increase of glucose consumption. we were observing what appears to be an increase of activity in the part of the brain closest to the antenna. >> what else would increase brain glucose? thinking, sports, etc.? >> the only function where you will see no cuckoos c