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The kicker: cognitive functions such as memory and response times were boosted by both 3G signals and the current signals, the study found. It said people became more alert when they were exposed to both. The study differed from most previous ones which measured the impact of cellphones held close to the head, causing high fields of radiation close to the ear and warming of the brain. This one used lower a dose of radiation to mimic base station signals rather than handsets.