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Neuroimaging study: Negative messages less effective on those who are substance dependent
Date:11/25/2012

BLOOMINGTON, Ind. -- What types of public messages will most likely deter drug and alcohol abuse or dissuade people from engaging in risky behavior? Negatively framed messages may not be an effective way to reach those most in need of persuasion, suggests a new study in Psychology of Addictive Behaviors by researchers from Indiana University and Wayne State University.

"The findings are somewhat ironic because a whole lot of public service announcements say, 'Drugs are bad for you,' 'Just say no,' or 'This is your brain on drugs' with an image of an egg frying," said principal investigator Joshua Brown, associate professor in the Department of Psychological and Brain Sciences in IU Bloomington's College of Arts and Sciences. "What we're seeing is that negative messages are not having the same impact on the brain."

Using neuroimaging techniques, the researchers examined the impact of different messages on the brains of substance-dependent individuals and compared them to their effects on non-substance-dependent individuals. They also sought to determine where the problem lies in the circuit between message, brain and behavior, where the signal goes wrong. Is it in the relationship between brain activity and behavior or in the impact of the message on the brain? Perhaps the brains of substance-dependent people are sensitive to risk, but the knowledge does not guide their behavior. Or perhaps substance-dependent people perceive messages differently in the first place.

To answer these questions, participants took part in a virtual game, the Iowa Gambling Task, often used in psychological studies on decision-making. Four decks of cards appear on a screen, and the participants were told they will either win or lose money by choosing certain decks. The substance-dependent group showed less brain activity in response to the negatively framed message that a certain deck would lead to losses. The negative messages also led to si
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Contact: Liz Rosdeitcher
rosdeitc@indiana.edu
812-855-4507
Indiana University
Source:Eurekalert  

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Neuroimaging study: Negative messages less effective on those who are substance dependent
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