Why Our Brains Stick Their Heads in the Sand (Metaphorically) When We Hear Bad News

By Sophie Bushwick | September 26, 2012 3:09 pm

head in the sand

We humans aren’t the most logical creatures. Take information processing: if we were perfect reasoners, we would absorb all the new facts we learn and use them to modify our view of the world. But while we do something like this with good news, bad news tends to go in one ear and out the other. While this good news / bad news effect gives you a more positive outlook on life, it can make you blindly optimistic, unprepared for the real consequences of medical problems or natural disasters.

In order to unravel this irrational thinking, researchers wanted to identify the responsible brain structure. They suspected the left or right inferior frontal gyrus, which is a ridge on the frontal lobes. These parts of the brain helps us update our beliefs and inhibit actions and memories, so the scientists suspected that they may be able to also inhibit our absorption of bad news.

To test their hypothesis, the researchers used magnetic stimulation to disrupt normal brain activity in 30 subjects, targeting either the left or right inferior frontal gyrus, or a control region of the brain. Then the participants had to estimate how likely 40 different negative events, from disease to robbery, were to happen to them. After making their best guess for each event, the subjects either received the uplifting news that the even was less likely to occur than they’d estimated, or the negative news that it was more likely to occur. In a follow-up session, the participants made new guesses for each event.

Under normal conditions, the updated estimates would take positive but not negative information into account. And this is exactly what happened in subjects who received magnetic stimulation in the right interior frontal gyrus or the control area. But the bias disappeared in those who had disruptions to the left interior frontal gyrus, which suggests that this brain region is responsible for the good news / bad news effect.

So now we know how to prevent our brains from chanting “la la la I can’t hear you” every time they hear something unpleasant. And while it’s hard to see magnetic stimulation becoming some sort of casual medical treatment, this finding does add a piece to the puzzle of how our brains function.

Image courtesy of Spartacus007 / flickr

  • Jim Johnson

    Hmmm. Given this info, I wonder if the inferior frontal gyrus has ever been implicated in chronic depression?

  • wilzard

    Curious if people with dunning-kruger have a misshapen inferior frontal gyrus…

  • floodmouse

    Does this “la la la I can’t hear you” effect have any adaptive value? I’m wondering if we have a psychological need to repress bad news in order to keep functioning. Chronic depression people seem to be immobilized by any kind of bad news, even the ordinary stuff that doesn’t slow most people down. Anyway, I still think brain training (behavioral & through biofeedback) is healthier than drugs or zapping someone with a strong magnetic field.

  • http://Discovery Su

    Of course it does, or we’d all be only children. If I remembered accurately what childbirth was like I would never had had a second (or third) baby. If I accurately remembered the horror stories everyone told me prior to getting pregnant, I may not have even had the first.

  • John Lerch

    Floodmouse is 100% relevant. This article says NOTHING about Why we can’t remember bad news. It tells us HOW we fail to remember bad news. You would think a writer about such stuff would remember at some time or other the DIFFERENCE between WHY and HOW.

  • Meg

    This is probably a really interesting article, but I just don’t feel like reading it.


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