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  • It’s early Monday morning and you realise you forgot to pick up your dry cleaning, you

  • can’t find your keys and then you have no idea what your Facebook password is.

  • As you start to panic, it feels like your memory kind of sucks. But your brain is designed

  • to forget. And it’s not necessarily a bad thing.

  • [BrainCraft intro]

  • Psychological theories try and make sense of why we forget pieces of information, like

  • all of our passwords. Decay theory suggests we can’t retrieve information because over

  • time, traces of our memories fade away and eventually disappear.

  • Interference theory suggests new memories compete with our existing ones. When new information

  • is similar to a memory you already have, the new information interferes with your ability

  • to recall that existing memory.

  • And in some cases, we didn’t even store a thought as a memory in the first place.

  • Neuroscientists suggest many of these theories could be intertwined - at a tiny molecular

  • level in your brain.

  • We have a “forgetting proteinin our brains called Musashi. It messes with the

  • function of our synapses, structures that let nerve cells communicate with each other.

  • Another protein called Adducin, has the opposite effect and actually stimulates the growth

  • of our synapses.

  • Remembering and forgetting thoughts is like a street fight between Musashi and Adducin.

  • Their interaction and who wins depends on whether our thoughts transmitted across our

  • synapses are stabilized and stored permanently in our memory.

  • In one study, researchers genetically modified some ringworms - so their brains didn’t contain musashi.

  • Let’s just call them teenage mutant ninja ringworms. The regular and mutant worms

  • learned new information just as well, but the mutant worms -- without Musashi -- had

  • much better recall of information. They were less forgetful.

  • By removing theforgetting proteinwe learn more about how it works. It could help

  • us understand disorders where people lose their memories, like Alzheimers, and how to

  • treat them. But, sadly, we can’t go removing Musashi from our brains to have a super powered

  • memory. Our brains forget on purpose.

  • We need to forget because the ability to lose information keeps our brains flexible so they

  • can absorb new things. If we didn’t forget, we’d constantly recall all kinds of random,

  • extraneous information and we wouldn’t be able to focus on the present.

  • Forgetting your passwords is frustrating, but it’s totally normal. As we go about

  • our daily lives, we subconsciously find a balance between remembering and forgetting.

  • So a "brain fart" or a “seniors momentisn't all that bad. Forgetting actually helps

  • you remember.

  • If you haven’t already, subscribe to BrainCraft for a new brainy episode every Thursday.

It’s early Monday morning and you realise you forgot to pick up your dry cleaning, you

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B1 中級

忘却の彼方 (The Upside of Forgetting)

  • 276 11
    林曉玉 に公開 2021 年 01 月 14 日
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