Para reflexão - boomerang effect

"Imagine you’re driving along the highway and you see an electric sign that reads, “79 traffic deaths this year.” Would this make you less likely to crash your car shortly after seeing the sign? Perhaps you think it would have no effect?

Neither are true. According to a recent peer-reviewed study that just came out in Science, you would be more likely to crash, not less. Talk about unintended consequences.

The study examined seven years of data from 880 electric highway signs that showed the number of deaths so far this year for one week each month as part of a safety campaign. The researchers found that the number of crashes increased by 1.52 percent within three miles of the signs on these safety campaign weeks, compared to the other weeks of the month when the signs didn’t show fatality information.

That’s about the same effect as raising the speed limit by four miles or decreasing the number of highway troopers by 10 percent. The scientists calculated that the social costs of such fatality messages amount to $377 million per year, with 2,600 additional crashes and 16 deaths.

The cause? Distracted driving. These “in-your-face” messages, the study finds, grab your attention and undermine your driving for the same reason you shouldn’t text and drive.

Supporting their hypothesis, the scientists discovered that the increase in crashes is higher when the reported deaths are higher. Thus, later in the year as the number of reported deaths on the sign goes up, so does the percentage of crashes. And it’s not the weather: The effect of showing the fatality messages decreased by 11 percent between January and February, as the displayed number of deaths was reset for the year. The scientists also uncovered that the increase in crashes is largest in more complex road segments that require more focus from the driver."

Ou então:

"Consider another safety campaign, the National Youth Anti-Drug Media Campaign between 1998 and 2004, which the U.S. Congress funded to the tune of $1 billion. Using professional advertising and public relations firms, the campaign created comprehensive marketing efforts that targeted youths aged 9 to 18 with anti-drug messaging, focusing on marijuana. The messages were spread by television, radio, websites, magazines, movie theaters, and other venues, as well as through partnerships with civic, professional, and community groups. The intention was for youths to see two to three ads per week.

A 2008 National Institutes of Health-funded study found that, indeed, youths did get exposure to two to three ads per week. However, on the whole, more exposure to advertising from the campaign led youths to be more likely to use marijuana, not less.

Why? The authors found evidence that youths who saw the ads got the impression that their peers used marijuana widely. As a result, the youths became more likely to use marijuana themselves. Indeed, the study found that those youths who saw more ads had a stronger belief that other youths used marijuana, and this belief made starting to use marijuana more likely. Talk about a boomerang effect."

Trechos retirados de "The Danger of Armchair Psychology"