How Humans Became (Mostly) Right-Handed 

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No other placental mammal that we know of prefers one side of the body so consistently, not even our closest primate relatives. But being right-handed may have deep evolutionary roots in our lineage. And yet, being a leftie does seem to come with some unexpected advantages.
Big thanks to Julio Lacerda ( JulioTheArtist​) for the excellent right-handed Neanderthal illustrations!
Produced in collaboration with PBS Digital Studios: iritem.info
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References: docs.google.com/document/d/1tNCtr8e_hLn_fk5xAe0ctaRKQh69JCeZgPAh_Y2n3mU/edit?usp=sharing

تاریخ انتشار


2021 24 مارس





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PBS Eons
PBS Eons پیش ماه
Some commenters have pointed out that we say "after our lineage split with chimpanzees," "members of our lineage after the split with chimpanzees," and "after our split from chimpanzees" at various points in this episode. Just to clear things up, humans and our extinct relatives share a common ancestor with chimpanzees and their extinct relatives. After our lineage split from this common ancestor, we call our group "hominins." Living chimpanzees also have their own separate evolutionary history since that shared common ancestor.
MinutemanSam پیش 11 روز
@gunzakimbo We did not split from them. Chimpanzees are our cousins, not our grandparents. We did not come from chimpanzees, nor are we more evolved than they are.
Riley پیش 17 روز
@John Johnson Writer mistake, it happens, humans make mistakes some times, even knowledgeable ones.
Bozz Skaggs
Bozz Skaggs پیش 26 روز
@D SP micro or macro?
alysdexia پیش 28 روز
@Ken Jackson I said why to another commenter here, for my repeated use of "information" and "spam" in the same comment which likely was detected as a commercial solicitation.
Grasshooper Cane
Grasshooper Cane پیش ماه
Cuando nos separamos de ese linaje a los chimpancés y a los humanos les faltaba todavía bastante para ser chimps o humans. Así que nunca nos separamos ni with ni from.
Logan Skiwyse
Logan Skiwyse پیش 18 ساعت
Is it just me or is something off with the portrayal of tool use. If I am using a sharp tool to scrap hide, why would I bring the tool towards my mouth? The area you would be scraping would be from the left hand to the mouth not side to side. Wouldn't it? And you would scrape towards your left hand, who wants to hit them selves in the mouth as indicated by these examples? Alternatively, could these marks be made by early versions of eating tools. We know in recorded history that a knife was the most common tool for eating in early history. And I seem to remember evidence of more primitive tools being used the same way. Wouldn't that fit both hand use and how the marks are made better then what is being described here? Just asking, if anyone has answers to this perspective feel free to point out any errors in my thinking.
Jake Martin
Jake Martin پیش 19 ساعت
I write with my left, eat cereal left but Throw, punch and bat with my right
The Pizza Cat
The Pizza Cat پیش 2 روز
Horses do have a prefered hand tho..
KiRAWRa پیش 3 روز
A bit disappointing that this video fails to mention anything about society's forced-use of right hands. Keyboards, computer mice, notebooks, scissors, you name it - all left-handed people are forced to use right-handed tools and are more likely to become right-hand dominant even if they weren't born that way. I was born a lefty but am now completely right-handed due to having to conform in this way.
lady mopar
lady mopar پیش 3 روز
And once again I am in the 10% of the population that are both I can use both hands equally
TV Viewer
TV Viewer پیش 4 روز
It is sad because "handed-ness" is just a sign the human is an idiot...
OberonsChild پیش 4 روز
What about people that are ambidextrous? Interesting video by the way. :)
Rebeckah Sypik
Rebeckah Sypik پیش 5 روز
You know it's funny people always ask if I am left handed when they see me pick on heavier things with my left. But I am actully right handed. I use my right hand for more delicate and precise moments. Both my Mother and grandmother where left handed, I wonder what part gentics plays in it being a spectrum.
Danny Hampton
Danny Hampton پیش 5 روز
Me and both my siblings are/were left handed. My mother trained it out of my older brother and sister but she said I was more stubborn with it so I'm still left handed. Although I do most thinks as a right handed person would. Writing is just about the only thing I do left handed, well I guess anything you hold like a pencil is, I do left handed. Not sure if this relates to being left handed in any way but I am also one of the few people who naturally drive with both feet even when not driving a manual transmission.
stickybuds420ish پیش 5 روز
So I totally heard, left handed ppl are less evolved...🤷‍♂️
Dick Van Draeman
Dick Van Draeman پیش 6 روز
Im ambidextrous, it just all depends on what the task is on what i use
Wayne Lee
Wayne Lee پیش 7 روز
For a long time I was not aware that people did not use both hands without preference - it still doesn't make a lot of sense to me - we've got two hands - I mean you use both ears, eyes and legs - I don't have a dominant side - just depends on what side is closest. I would have thought handedness would be a disadvantage.
Landon Lingenfelter
Landon Lingenfelter پیش 7 روز
Left hand gang
Jon Loc
Jon Loc پیش 7 روز
You aren't truly left handed unless you know the pain of smudging all your work
Rhys Griffin
Rhys Griffin پیش 7 روز
I can imagine the maturity of the comments hehe
shubham bhuwania
shubham bhuwania پیش 7 روز
Repeating same line again and again just paraphrased.
J. M. Pérez
J. M. Pérez پیش 7 روز
I feel that it has more to do with eyesight
Jaysun پیش 8 روز
What makes humans unique from their primal relatives are their bipedalism (walking on two feet ) , larger brains and use of tools. Neantherthals used tools and digested meat very well. #Activestudying
Cat Sync
Cat Sync پیش 9 روز
The patriarchy is strong in this video - most of the human predecessors are shown male
Swich Rhymes
Swich Rhymes پیش 9 روز
I knew they were gonna bring up the boxing aspect of this.
Rick Valley
Rick Valley پیش 9 روز
I'm a mix- lefty, except for throwing side-arm, (right only) write left except at a blackboard (either) used to bat switch but right only now. Driving on the left came easy to me, I was able to take a rental combi onto a huge roundabout at rush hour and make the correct turn off easily the first time.
Pâthétïç پیش 9 روز
i remember my 1st grade friend which is a girl is left handed and get forced by the teacher to use right hand so now she prefer using right hand
Mo Ji
Mo Ji پیش 10 روز
I noticed my kittens are mostly left handed, strange!
Neinka پیش 10 روز
I wonder how many left handed people use pc mouse in their left hand? Because when I started using pc there were not even left handed mice available. So I use it in my right hand and it feels wired when I try it in the left.
Lynwood Jackson
Lynwood Jackson پیش 11 روز
I'm a left-handed, blue-eyed, redhead. It seems like statistically, I shouldn't exist.
Tommy the Cat
Tommy the Cat پیش 11 روز
Writing was a pain for me, I'd always end up with graphite or ink from my pinkie to the elbow. Until the first day of Hebrew school (which, like Arabic, is written from right to left), from then on I was an aristocrat among peasants!
wvu05 پیش 12 روز
I remember getting a massage one time, and the therapist asked me if I was left handed. I was surprised and asked her how she guessed, and she said that the muscles in my arm gave it away.
wvu05 پیش 12 روز
I had a cat that would almost always paw with his left.
GilKyu Kim
GilKyu Kim پیش 12 روز
❌Did i specifically search for this video? ❌Was i ever curious about this topic? ✅Do i want to know why right handers are more dominant?
Kal Wayne
Kal Wayne پیش 12 روز
What about the fact that once we evolved to believe in Catholicism the left Shand was viewed as in clean , all the way up till the 60s children were forced to use their right hands
Jung K
Jung K پیش 13 روز
Born Lefty Learned Right Became Ambidextrous
Tim Gilmore
Tim Gilmore پیش 13 روز
Anyone else write with their left hand and do..ugh everything else with their left hand..?
Don K
Don K پیش 13 روز
Organisms unsuited for specific environments would in lieu of "adapt" simply perish
Don K
Don K پیش 13 روز
Bacteria always retain their form unmodified
jkjkjk پیش 13 روز
you always want a lefty fireballer in baseball!
Adam Loverin
Adam Loverin پیش 13 روز
If the left side of the brain controls the right side of the body and right side of the brain controls the left side of the body, that means only left handed people are in their right minds. ;)
John Steiner
John Steiner پیش 14 روز
Handedness is also observed in canines. Watch a domestic or wild canine running and notice which forepaw consistently connects to the ground about a quarter to a third cycle sooner than the other.
Jane Ross
Jane Ross پیش 14 روز
What's with that thing people say where left-handed people are supposed to be twins where only one of them got born? Is that just a myth, then? Wouldn't seem to gel with the rest of this.
NiNi J
NiNi J پیش 14 روز
My granny thought it was a sign of evil if we were left-handed, so she forced us to be right handed. But I have always used both hands.
psyched traveler
psyched traveler پیش 12 روز
That was incredibly common with the Christian boomers
Ouis Sandy
Ouis Sandy پیش 14 روز
I learned to shoot left handed and fight southie just in case
Suzanne Meyer
Suzanne Meyer پیش 14 روز
Before utensils aka knife, spoon etc humans ate food with their right hand, the left hand was used to clean oneself after the toilet, l remember being beaten for using my left hand to simply write, this is far to complex a subject for this format
Steven Hunt
Steven Hunt پیش 14 روز
Always lead with the left uppercut instead of the right haymaker - dodge this bruh
Benjamin Drake
Benjamin Drake پیش 17 روز
So my left handed ness is extra rare? I’m an afab person, and the only other person in the fam who is left handed is my aunt, who married into the fam
kevin k
kevin k پیش 17 روز
the 1.4k dislikes are all left handed
Abraham Earthstein
Abraham Earthstein پیش 18 روز
Mohammad, the prophet, was left handed. Gawd is right handed.
Jose Carvajal
Jose Carvajal پیش 18 روز
5:17 Licey campeón!! Capital e capital, lo demás es monte y culbera! (Dominican will understand)
Jeremy Maloof
Jeremy Maloof پیش 18 روز
My momma said she didn't want me a left hander, so she put the fork in my right hand.
Larry D
Larry D پیش 19 روز
I think it was because the way your unit points.
HelloThere پیش 19 روز
Neither boxer in the background uses left handed stance. not that all lefties do, but it would show how big of a difference it is in this case.
Patrick Murphy
Patrick Murphy پیش 19 روز
This guy looks like if jim breuer paid attention in school.
Crocey ZX
Crocey ZX پیش 19 روز
I only use my left when using a pen/pencil for writing and drawing, but everything else such as using scissors, throwing a ball or even holding my phone, I use my right.
Am bros 77
Am bros 77 پیش 20 روز
Being left handed I should start boxing lmao
Am bros 77
Am bros 77 پیش 20 روز
Being left handed everything just works against me
SJ Muller
SJ Muller پیش 20 روز
Left Handed. Not more coordinated. Sad, but true.
Migs Mdrno
Migs Mdrno پیش 20 روز
I'm ambidextrous and my religion teacher said it is a sign of being possessed by a demon😒😒😒
jcudal32 پیش 21 روز
I'm super ambidextrous. I can use my left and right and I can write upside down with both left and right.
RIOT_ BABY22 پیش 21 روز
The “lefty advantage” shown today makes me think it’s been bouncing back and forth were at some points most humans were left handed and being right handed was an advantage and then it just went back around to left being advantageous over and over again
Jericko Doggo
Jericko Doggo پیش 21 روز
They mentioned fighting for lefties. But another reason you could have a dominance in rights, is because working together makes it easier if people are same handed. You know how you can form a very strong bond when you grab some ones wrist and they grab yours. This type of strong grab doesn't work if people are grabbing with opposite hands. SO if you're about to slip off a cliff and some one reaches out for you. You'd better hope you both instinctively go for the same hand 😂
Liam Short
Liam Short پیش 21 روز
Is ambiguous handedness in humans even a thing
Johan Meijlaers
Johan Meijlaers پیش 21 روز
Left handed. Right handed. Ambidextrous is handy with both hands. Ambisinistrous is un-handy with both hands. It's a condition often caused by forcing a left handed person to become right handed.
Your Big Head Cousin
Your Big Head Cousin پیش 21 روز
Im very right handed but I can't drive with my right.
Fraun Flerchinger
Fraun Flerchinger پیش 22 روز
I’ve always had my own theory; females held their babies close to their heart in order to comfort them. This meant they would mostly hold them with their left hand, leaving their right hand free for tasks. Being better with their right hand was therefore favoured by evolution.
Jacob Franklin
Jacob Franklin پیش 22 روز
Left handed af
Paul Evans
Paul Evans پیش 22 روز
Chimpanzees are 65% right-handed, Gorillas 75% right-handed but Orangutans are 66% left-handed.
Paul Evans
Paul Evans پیش 22 روز
Lots of animals show preference to one side. Other primates do and even breeds of mice can have dominant left or right sides. In fact 32% of animal species that we know of favour one side or the other.
Julian T.
Julian T. پیش 22 روز
I was born left-handed, but my parents basically made me become right-handed when I was 4 or 5, so now I'm right-handed.
Gihan R
Gihan R پیش 22 روز
a lot of domestic cats seem to be left-handed too, since they seem to hit more often with their left paws.
Pontanellen1 پیش 22 روز
I think that we also have a preferred foot. Why is that not elaborated a bit more on? It has to relate to a similar or the same reason and may help to explain things imo.
VioletWhirlwind پیش 23 روز
Proud leftie, right here! (Well...mostly anyway...there are a few things I'm ambidextrous with.) My mom is also a leftie, as was her mom (though the schools apparently forced my grandma to become right-handed, I don't know how or why) Anyway, there's a saying I like...: "Lefties are the only people in their right minds." XP Although...that gets me wondering...why DOES it swap sides (brain vs. body) like that anyway? Also, I have heard that lefties are more creative than righties, whereas righties are more anylytical (sp?) than lefties.
KayKay2513 پیش 23 روز
My oldest brother is left handed. I'm definitely never telling him this. He's arrogant enough 🙄
shahid hayat
shahid hayat پیش 23 روز
So I'll start practicing with left hand
Hans Kotto
Hans Kotto پیش 24 روز
Me having no left arm: exists Everyone: Soo are you left or right handed?
GabDubé پیش 24 روز
How, exactly, would that be genetic? AFAIK there's way more evidence for "handedness" to be a gradually-acquired trait during sensory-motor development rather than an innate or genetic trait.
GabDubé پیش 24 روز
Being an acquired trait would also fit with it being partly-hereditary. You are more likely to become left-handed if you see people doing things left-handed, or if the tools/toys available to you were made to be left-handed.
Corey پیش 24 روز
Monke1: Hold like this. Monke2: *holds left handed* Monke1: Nonono, hold like this. Monke2: *switches hand*
Willy پیش 25 روز
Left handed people be like : who made us?
Siyatshaheb پیش 25 روز
Every left handed people I have ever met are special...extraordinary and possess special talents
Siyatshaheb پیش 25 روز
2:09 a deer
SecretAgent02 پیش 26 روز
Aren't chimpanzees and bonobos also right-handed when given something to write with or are gripping an object? Left-handedness is associated with neurological dysfunction, aside those who just inherit it from their family members. ETA: Yep. The video agrees. He said all human species.
Future Man 420
Future Man 420 پیش 26 روز
I didnt get the T rex joke help?
EspressoBug پیش 27 روز
My husband and my sister are both lefties. I trained myself to use my left hand much more than the average person. I wanted to be ambidextrous. My paternal grandma was also left handed. But teachers made her write a lot with her right hand. So she could use both I believe. I learned a lot of crafts from her left handed craft books. 😅 I had incentive to use both hands. I'm in the process of learning continental knitting left handed so I don't have to pause to flip my project over. Nothing like minimizing effort to encourage learning a new skill. I also wanna be one of those old ladies one day that can clickity clack knitting needles while hardly moving and spit out a project at lightening speed.
Nino Miškulin
Nino Miškulin پیش 27 روز
"How humans got right handed" - talks about neanderthal who is not human ancestor
Weather Moon
Weather Moon پیش 27 روز
Fun fact: I upholstered chair backs and seats at factory. There were only two of us that were left handed. Our staples angled opposite of the right handers. I was red tagged as the "owner" of hundred bad pieces. I proved they couldn't be mine due to the angle. 😁
Future Man 420
Future Man 420 پیش 26 روز
showed them Lolz
Weather Moon
Weather Moon پیش 27 روز
I'm a lefty, very much a lefty, the only known lefty in the family. My daughter is a lefty, her son's father is a lefty. Her son is a righty 😢😢😢😢 We love him, but he'll never know the pain of living in a right handed world.
Paul McDonagh
Paul McDonagh پیش 27 روز
1:50 that is really really bad knife safety and a great way to chop off at least your nail if not the tip of your finger.
Dave Strider27
Dave Strider27 پیش 27 روز
Me, a left hander: fascinating
Fern Melg
Fern Melg پیش 27 روز
That little smirk at the end lol
S پیش 28 روز
Getting into a street fight with a left handed person is a whole different fight lmaoo
Aditya Mohan
Aditya Mohan پیش 28 روز
being a leftie you can write on a sheet at an angle more than 90°. Its not a trait of being left handed. Its just an adjustment you need to make to study on the same bench filled with right handed people.
Aditya Mohan
Aditya Mohan پیش 28 روز
also every arm wrestling bout with a friend ends in a tie. Right arm = you lose, left arm = you win.
Tanya Tran
Tanya Tran پیش 28 روز
I’m left handed but when it comes to sports my right hand and right leg are stronger and I feel more comfortable using them for sports. But when it comes to my left hand I only use it for holding a pencil. Not even a mouse. Isn’t that strange!
Queen Blister
Queen Blister پیش 28 روز
I realized I'm left handed :^
roberto armstrong
roberto armstrong پیش 28 روز
Did he say 130,000 years ago?...
Z2B1RDIUS پیش 29 روز
who else is left handed
Zofia Jaworek
Zofia Jaworek پیش ماه
Make a video about thylacoleo and it's insane teeth! 😃
Saif Qasem
Saif Qasem پیش ماه
Is ti weird that i am a lefty with my hind but my main foot is right?
DaBudKing پیش ماه
I feel like hockey is an exception to this video, cause I think there’s more lefties in the sport than righties, I myself am a lefty in hockey but rightly in everything else! Also lefties are generally better in stick handling while righties have a harder shot!
Grasshooper Cane
Grasshooper Cane پیش ماه
Tío, ponte al día. El último ancestro común con los Nändertalles, son, tampoco eran. As I was telling you, ouer last comon ancestor with the Neandertales, are and when I say are its not a verbal tense mistake, quiero decir que lo somos ( no que lo fueron ), somos nosotros, que salvo en Africa, solemos ser entre un 2 y un 10% Neandertales. Por lo demás muy interesante tu video. I like it.
Yehoshua Smith
Yehoshua Smith پیش ماه
I'm technically left-handed and so is my dad, but I write with my right hand because that's the hand I was taught to write with. Also, boxing as a southpaw can be a pain when you're on mitts lmao...
lanietalk پیش ماه
The fingers on my right hand are thicker than the fingers on my left
danteelite پیش ماه
My best friend growing up was a very rare “true ambidextrous” person. He was perfectly ambidextrous even at a young age, with full 100% even control with both hands and he did tons of studies growing up about it and showed that his brain was symmetrical, to an odd degree even beyond the average ambi person. He would often do demonstrations writing with both hands, but also capable of writing backwards with one of them, at the same time! It was weird and kinda cool. Pretty neat. I always liked people with interesting quirks, like my exgf with an odd heterochromia. People are awesome!
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