"This study joins a growing body of research showing that 'freeing up the hands' does not result in faster brake response times," says Levy, the lead author on the project. He adds, "not everyone appreciates the processing cost while driving imposed by carrying out other tasks, even easy ones."
When I did my elementary NLP, we were given a model of our ability to concentrate or give attention which was "7+ or - 2". That is 7 units of attention [left undefined]. The point was that attention is not infinitely elastic. There is a limit to multitasking. Now in NLP the point is developed into how when people's attention is taken up with other things, they/we tend to leak information about our attitudes or inner state of mind because we can't moniter our non-verbal output so well and that is the area of signalling to which we pay least conscious attention anyway.
So it's no surprise that driving needs more attention than we often give it. But here's further evidence. But it also circumstantially says that the NLP folks are onto something.
ScienceDaily: 'Hands Free' Isn't Mind Free: Performing Even Easy Tasks Impairs Driving:
Filed in: psychology, attention, driving, hands-free, concentration
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