Researchers use magnetic pulses to brain to reduce overly optimistic tendencies
$this->bbcode_second_pass_quote('', 'S')cientists have known for many years that human beings, as a general rule, are an overly optimistic bunch. We close our eyes to statistics suggesting our eating habits may be killing us, ignore warnings about texting while driving and almost always believe things will come out all right in the end if we'll just hang in there, despite sometimes obvious indications to the contrary. Research has suggested that two specific symmetrically opposite parts of the brain influence our optimism or pessimism
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The only change noted was for those that had had the TIMS directed onto their left IFG; they became noticeably more logical and less likely to paint a rosier picture of the evidence just presented to them.
While the study offers clear evidence that the left IFG is most certainly involved in our generally overly optimistic outlook, it doesn't explain how it does so, or why, though the researchers suggest it might be a trait we've evolved to make us more likely to overlook some dangers so that we'll seek out and explore new environments, increasing the likelihood of our survival overall by populating more areas.
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Humans form beliefs asymmetrically; we tend to discount bad news but embrace good news. This reduced impact of unfavorable information on belief updating may have important societal implications, including the generation of financial market bubbles, ill preparedness in the face of natural disasters, and overly aggressive medical decisions. Here, we selectively improved people's tendency to incorporate bad news into their beliefs by disrupting the function of the left (but not right) inferior frontal gyrus using transcranial magnetic stimulation, thereby eliminating the engrained "good news/bad news effect." Our results provide an instance of how selective disruption of regional human brain function paradoxically enhances the ability to incorporate unfavorable information into beliefs of vulnerability.






