Are More Left-Handed People Neurodivergent? - Yes

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ASPartOfMe
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28 Aug 2025, 8:25 pm

New study shows that left-handedness is more common in neurodivergent people.

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About 10.6 percent of people are left-handed and the rest right-handed. One question that is not well understood is whether left-handedness is more common in neurodiverse and neurodivergent people than in the general population.

As neurodiverse and neurodivergent people perceive their brains as working different than those of other people, and left-handers have a switched organization of the motor areas of the brain (in right-handers, the left motor cortex is dominant for fine motor behaviors such as writing; in left-handers, it’s the right motor cortex), it is an interesting research question to see whether there is a link between these two traits.

A New Study on Left-Handedness in Neurodiverse People
A new study, recently published in the scientific journal Psychological Bulletin, now focuses on investigating whether there are conditions that are linked to increased left-handedness (Disclaimer: I am one of the co-authors of the study). The research team, led by scientist Julian Packheiser from Ruhr University Bochum in Germany, conducted a so-called second-level meta-analysis on left-handedness in various conditions, such as ADHD, autism, dyslexia, and many others.

A meta-analysis is a study that statistically integrates data from many original scientific studies. By doing so, a larger amount of data can be analysed and the results are more robust than those of smaller studies.

A secondary meta-analysis goes even further: It integrates results from many different meta-analyses, making the data pool even larger. Overall, data on left-handedness from over 200,000 individuals across more than 400 original studies were included in the study.

What Did the Scientists Find Out?
The results of the study were very interesting: Whether people showed increased left-handedness depended on their condition. The data showed a strong and significant effect for autism, indicating left-handedness was considerably more common in neurodiverse people than in the general population.

Significant, but weaker, effects were also observed for ADHD and dyslexia. Thus, these conditions were also linked to an increase in left-handedness. However, this increase was not as strong as in autism.

In contrast, PTSD and depression were not linked to an increase in left-handedness. An integrative analysis showed that left-handedness was particularly increased in conditions that started early in life and showed a language component.

underlining=mime:


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Tamaya
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29 Aug 2025, 11:35 am

Everything that's a minority in the human population seems to be only more common in autistics.


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Irulan
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29 Aug 2025, 4:12 pm

I'm right-handed but here comes a story I never told here :D - when I was a mere baby, my mother noticed that when I was reaching for something, I was doing this predominantly with my left hand. She was afraid I was going to grow up to be left-handed. Some supersticious old lady she knew, advised her that when she was going to put on me my baptismal dress before baptizing me, she should start dressing me from putting my RIGHT hand into the sleeve as first - not the left one 8O Aaaand - it seemingly helped, for I use now my right hand like any other NORMAL person :D :lol: My mom is obsessed with the concept of NORMALCY :P She's quite a narrow-minded person.

Btw, when it comes to my being baptized, I kept taking off the piece of the material covering me - my mom thought it's the sign I was going to grow up to be an atheist :D



Mikurotoro92
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29 Aug 2025, 9:08 pm

I am left-handed and Autistic so there is some truth to these statistics!! !

Makes me wonder about famous creators like Shigeru Miyamoto and Stephen Hillenburg...



ASPartOfMe
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29 Aug 2025, 11:27 pm

Irulan wrote:
I'm right-handed but here comes a story I never told here :D - when I was a mere baby, my mother noticed that when I was reaching for something, I was doing this predominantly with my left hand. She was afraid I was going to grow up to be left-handed. Some supersticious old lady she knew, advised her that when she was going to put on me my baptismal dress before baptizing me, she should start dressing me from putting my RIGHT hand into the sleeve as first - not the left one 8O Aaaand - it seemingly helped, for I use now my right hand like any other NORMAL person :D :lol: My mom is obsessed with the concept of NORMALCY :P She's quite a narrow-minded person.

Btw, when it comes to my being baptized, I kept taking off the piece of the material covering me - my mom thought it's the sign I was going to grow up to be an atheist :D


Up until the 1960s or so in American schools it was not uncommon for teachers to hit students with a ruler on the knuckles if they were caught writing with their left hand.

Stereotypes of lefties as weird or flaky linger.


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Jakki
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30 Aug 2025, 12:58 am

Yup ...definitely a Lefty .BUT after my late teens past. had a crash , much spinal cord damage on the left side.
It took about 3 months after finally got out of the hospital and then out of the second and third and last was a rehab for brain trauma and I could then get a chance to practice many months later , requesting my mom to help me to learn to write again ,After about a week or 2 later she got tired of re-teaching me to write .some 18 yrs after the first time.
Do now am right handed , but still left eyed according to tests. Left side reflexes quicker than right. Right hand does not have the detail for the 12 different styles of writing used to be able to write including Gothic Calligraphy. Lucky if the right hand can do 4 . Had a strong leaning towards creativity . Drawing and much more before lost use of the left hand.
But sad as it maybe, It is as it is , And now am a Righty. :roll:


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auntblabby
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30 Aug 2025, 1:05 am

I wonder how many lefties on WP were, as children, strongly encouraged or forced to become right-handed?



ASPartOfMe
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30 Aug 2025, 1:12 am

Jakki wrote:
Yup ...definitely a Lefty .BUT after my late teens past. had a crash , much spinal cord damage on the left side.
It took about 3 months after finally got out of the hospital and then out of the second and third and last was a rehab for brain trauma and I could then get a chance to practice many months later , requesting my mom to help me to learn to write again ,After about a week or 2 later she got tired of re-teaching me to write .some 18 yrs after the first time.
Do now am right handed , but still left eyed according to tests. Left side reflexes quicker than right. Right hand does not have the detail for the 12 different styles of writing used to be able to write including Gothic Calligraphy. Lucky if the right hand can do 4 . Had a strong leaning towards creativity . Drawing and much more before lost use of the left hand.
But sad as it maybe, It is as it is , And now am a Righty. :roll:


Sorry about that.

If you are interested occupational therapists teach people with spinal cord injuries how to write again.


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firemonkey
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30 Aug 2025, 5:56 am

I'm the only left handed member of my family. ASD + schizophrenia/schizoaffective + very likely dyspraxia + likely dysgraphia + possible ADHD- inattentive


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Irulan
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30 Aug 2025, 12:44 pm

That aspie boy (if he didn't have ASD, I'm going to eat my own shoes) who was in one class with me in elementary school, was left-handed from what I remember. He also had dyslexia and (like myself) dyspraxia.