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Aug 31, 2018
I recently asked a bunch of top psychologists to tell me what blows their mind , and one of the responses I received really freaked me out.

According to scientific research, one psychologist told me, human fears are at least partly erasable. All it takes is a single pill.

The latest evidence of that phenomenon comes from a study published in December 2015 by researchers at the University of Amsterdam.

For the study , the researchers recruited 45 women who reported being afraid of spiders. All the women were asked to open a jar with a baby tarantula inside, touch the spider, let it walk on their bare hands, and report how frightened they felt. They were allowed to stop the procedure at any point — and none of the participants ended up getting to the point where they touched the spider.

Next, some of the women were given a pill containing the drug propranolol, while the rest were given a placebo. Propranolol is a beta-blocker, which means it blocks the hormone adrenaline. (None of the women knew what pill they were consuming.)

Four days later, all the participants returned to the lab. Some were asked to touch the tarantula again and report how frightened they felt; others weren't.

Sure enough, all the women who'd taken propranolol were able to touch the tarantula,and reported being less afraid. On the other hand, none of the women who'd taken the placebo were able to touch the spider as instructed. And the women who'd taken the propranolol without touching the spider reported being just as fearful as they were before.

The really scary part? Even one year later , these effects persisted.

In other words, propranolol plus being re-exposed to the tarantula seemed to reduce the women's fear of spiders.

That's likely because propranolol blocks a chemical in the brain that facilitates learning, meaning it disrupts the process of "memory reconsolidation," or the way a memory is stored after it's retrieved.

This study builds on previous research on rats , which found that there's a brief window of time during memory reconsolidation when memories can be altered