WASHINGTON (Reuters) -- Using a cell phone -- even with a hands-free device -- may distract drivers because the brain cannot handle both tasks, U.S. researchers said Tuesday. Imaging tests show the brain directs its resources to either visual input or auditory input, but cannot fully activate both at the same time, the team at Johns Hopkins University in Baltimore found.
.."It's as if the participants were changing the volume on visual input and auditory input depending on where they were supposed to be directing attention," Yantis said. This is like driving and trying to talk on a cell phone. "You are sharing attention between vision and audition and doing the best you can,"..
More/full story from cnn can be seen here: