16 novembre 2016

Comment le cerveau humain s'adapte à la malhonnêteté

Que se passe-t-il dans le cerveau lorsqu'on ment? Et que se passe-t-il lorsqu'on répète l'exercice encore et encore? Extrait de l'article de Sci-News:

“We provide empirical evidence that dishonesty gradually increases with repetition when all else is held constant.”

“This experimental result is consistent with anecdotal observations of small digressions gradually snowballing into larger ones.”

The authors scanned volunteers’ brains while they took part in tasks where they could lie for personal gain.

They found that the amygdala, a brain area intricately involved in emotional responses, was most active when people first lied for personal gain. The amygdala’s response to lying declined with every lie while the magnitude of the lies escalated.

The team also found that larger drops in amygdala activity predicted bigger lies in future.

“Using functional magnetic resonance imaging (fMRI), we show that signal reduction in the amygdala is sensitive to the history of dishonest behavior, consistent with adaptation,” the scientists explained.

“Critically, the extent of reduced amygdala sensitivity to dishonesty on a present decision relative to the previous one predicts the magnitude of escalation of self-serving dishonesty on the next decision.”

“This may lead to a ‘slippery slope’ where small acts of dishonesty escalate into more significant lies,” Dr. Sharot added.

(...) “It is likely the brain’s blunted response to repeated acts of dishonesty reflects a reduced emotional response to these acts,” Dr. Garrett said.

“This is in line with suggestions that our amygdala signals aversion to acts that we consider wrong or immoral.”

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