The human brain processes a lot less than we realize, and has pretty low awareness of its deficiencies. This is an interesting story based on that, with significant implications:
What Clown on a Unicycle? Studying Cellphone Distraction
How much do you miss when you’re distracted by a cellphone conversation?
Researchers at Western Washington University in Bellingham, Wash.,
decided to study whether talking on a cellphone was such a distraction
that people wouldn’t notice obvious events happening in the world
around them. They theorized that people engrossed in a phone call had
“inattentional blindness,” meaning that they looked at their
surroundings as they talked, but none of it registered.
A student volunteer pedaled a unicycle around a pedestrian square; researchers surveyed passers-by to see whether they noticed him:
Among pedestrians who were listening to music or walking alone, one
in three mentioned that they had just seen a clown on a unicycle.
Nearly 60 percent of people who were walking with a friend mentioned
the clown. But among people who had been talking on the cellphone, only
8 percent spontaneously remembered the clown.
Then the researchers followed up with a second question: “Did you
see the unicycling clown?” With prompting, 71 percent of the people
walking with a friend remembered the clown. The numbers were also
higher for people listening to music (61 percent) and those who were
walking alone (51 percent).
But among those who had been talking on a cellphone, the ability to
recall seeing the clown still was startlingly low. Only 25 percent of
cellphone talkers remembered seeing a clown on a unicycle, according to the report in the journal Applied Cognitive Psychology.
“It’s a huge dropoff of awareness of the environment around them,”
Dr. Hyman said. “It shows that even during as simple a task as walking,
performance drops off when talking on the cellphone. They’re slower,
less aware of their surroundings and weaving around more. It shows how
much worse it would be if they were driving a car, which is a more
complex task to manage.”
I suppose I could dispute his conclusion about driving safety: walking in a familiar spot is a low risk/low attention activity; maybe the brain registers the clown, dismisses is as a threat, and moves on. To conclude that the brain would behave similarly during a high-risk activity like driving may be a logical leap too far.
That said, I would expect that driving on a familiar road while chatting on the cell phone could be very dangerous. Remember - if you don't see the clown show, you many become part of the clown show.
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