Our phones are training our brains to be in a nearly constant state of stress and fear by establishing a stress-fear memory pathway, endocrinologist Robert Lustig tols Business Insider. And such a state means that the prefrontal cortex, the part of our brains that normally deals with some of our highest-order cognitive functioning, goes completely haywire, and basically shuts down.
Scientists have known for years what people often won't admit to themselves: humans can't really multi-task. This is true for almost all of us: about 97.5% of the population. The other 2.5% have freakish abilities; scientists call them "super taskers," because they can actually successfully do more than one thing at once. They can drive while talking on the phone, without compromising their ability to gab or shift gears.