I know its true that when trying to walk through a store or when winding my way through traffic the cell phone users are dim-witted and in the way.
The researchers in Australia, England, and the Netherlands studied 300 persons and as published in the International Journal of Neuroscience, looked at the group of people over 2.4 years. A larger study expands the basics here to gather data on 17,000 people over a longer period of time.