Name: 為什麼你是右撇子不是左撇子？ (why you're NOT left-handed)
Uploaded: 2025-06-05T21:01:30.000Z
Duration: 1 min 48 s

基礎被動語態

Your brain is split into two halves, the left hemisphere and the right hemisphere.

你的大腦分為兩半，即左半球和右半球。

分詞構句

And for some weird reason, each half controls the opposite side of your body, not confusing at all.

由於某些奇怪的原因，每一半都控制著你身體的另一側，一點也不令人困惑。

Most people, like 90% of the planet, have a dominant left hemisphere,

大多數人（例如地球上 90% 的人）的左半球占主導地位，

meaning their right hand is their go-to for writing or whatever else people do with their hands.

這意味著他們用右手寫字或做其他用手做的事情。

But lefties are different. Their right hemisphere is stronger, making their left hand dominant.

但左撇子不一樣，他們的右半球更強，左手佔優勢。

It's not like there's a single reason for this.

It's more of a messy mix of genes and environment.

這更像是基因和環境的混亂組合。

Probably a tiny shift in brain development during pregnancy gives the right hemisphere a little extra power boost.

可能是懷孕期間大腦發育的微小變化給右半球帶來了額外的動力。

So if left-handedness runs in families, it must be genetic, right?

所以，如果左撇子是家族遺傳，那一定是遺傳，對嗎？

There isn't anything like a left-handed gene.

Instead, it looks like a bunch of genes working together.

相反，它看起來像是一群基因在一起運作。

For example, if your parents are both left-handed, you've got a higher chance of being a lefty too, but even then, it's not guaranteed.

例如，如果你的父母都是左撇子，那麼你成為左撇子的機率也會更高，但即便如此，也不能保證你一定是左撇子。

Because genetics isn't the only thing deciding this.

因為基因並不是唯一的決定因素。

The real mystery is why most people end up right-handed in the first place.

真正的奧祕在於，為什麼大多數人一開始都是右撇子。

See, back in ancient times, most people used their right hand for tools, weapons, and general survival.

你看，在古代，大多數人都用右手來使用工具、武器和一般的生存工具。

So society naturally favored right-handedness.

In combat, left-handers had the element of surprise because most people were used to fighting righties.

在戰鬥中，左撇子具有出其不意的優勢，因為大多數人習慣於與右撇子作戰。

In sports like boxing, lefties tend to dominate because their opponents aren't used to them.

在拳擊等運動中，左撇子往往佔據優勢，因為對手不習慣他們。

But here's the catch. Fighting alone doesn't build civilizations.

但問題是，光靠戰鬥並不能建立文明。

People had to cooperate, share tools, and build societies.

人們必須合作，共享工具，建立社會。

Those tools and systems were designed for right-handed people.

這些工具和系統都是為慣用右手的人設計的，

Left-handedness was useful enough to stick around, but never became common enough to dominate.

左撇子足夠有用，可以繼續存在，但從未變得足夠普遍，以至於佔據主導地位。

So unless your brain development took a different turn, odds are you ended up right-handed.

所以除非你的大腦發育發生了變化，否則你很可能是右撇子。