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The psychologists invited 60 men and women aged between 20 and 28 as subjects and tested them on almost the same driving tasks under three noise condition : silence,rock music played at a gentle 55 decibels, and the smae music at 85 decibels.
For the tracking task,there was no difference in performance under the three noise conditions.But under both the loud and quiet music conditions, the performers "braked" at red light about 50 miliseconds sooner than they did when there was no music at all. That could mean a reduction in braking distance of a couple of meters actually, the difference between life and death for a pedestrian.
When it came to the arrows that appeare across the visual field, the psychologists found that when the music was quiet ,people responded faster to objects in their central field of sight by about 50 millisecond . For the people listening at 85 decibels, response times dropped by a further 50 milliseconds, a whole tenth of second faster than those "driving " with no music .
"But there's a trade-off " the psychologists told the European Congress of Psychology ."They lose the ability to look around the whole situation effectively ."In responding to objects that suddenly appeared , people subjected to 85-decibel rock music were around 100 milliseconds slower than the other groups .Since some accidents , such as children running into the road, take place without any notice, drivers listiening to loud music must be less safe as a result .