
Two hands can be better than one. A well-coordinated effort of both hands makes it possible to count to 255 on your fingers (FF in hexadecimal). But mixed handedness may have consequences. Photo by Hexadecimal Time.
I always thought I was left handed. Oh sure, I do some things with my right hand, but we go by the hand you write with, right?
Actually, handedness is not a binary choice, but a continuum from purely left handed to purely right handed. Researchers say that people often aren’t aware that they’re officially mixed handed.
In a common measure of handedness called the Edinburgh Handedness Inventory, people are asked to perform 10 specific tasks. Doing even one of them with the other hand makes you mixed handed. I do 6 with my left, and 4 with my right, putting me towards the neutral end of the “mixed left hander” category.
There are different versions of this test floating around. One of them lets you specify different levels of hand preference, and gives you a numerical score from -1.0 for a pure left hander to +1.0 for a pure right hander, with 0.0 indicating that neither hand is preferred overall. I got -0.2, or just left of neutral.
I made this Handedness test into a web application, to spare people from the math. Give it a go. I’ll create a page listing the scores people report, so leave a comment with your score and I’ll link to you (links will be no-follow, the name you use can include branding words but must start with your real name, and your URL should point to actual content rather than an ad).
When I found out that using my right hand for so many tasks wasn’t typical for a left hander, I thought about what I do with each hand, to see if there was a pattern. There wasn’t a clear pattern, but I noticed some interesting combinations:
| Things I do left handed |
Things I do right handed |
| Using a fork (without a knife), with a stabbing motion (like for sausage) |
Using a fork (without a knife), with a scooping motion (like for rice) |
| Firing a pistol |
Firing a rifle |
| Boxing |
Kickboxing |
| Using a sword with one hand |
Using a sword with two hands |
| Juggling an odd number of objects |
Juggling an even number of objects |
Left handers are much more likely to be mixed handed than right handers are. For one thing, lefties are forced to adapt to a right handed world. Lefties also tend to have more symmetrical brains, resulting in natural mixed handedness. There are both pros and cons to mixed handedness, and I’ll write about this later, after I learn more about it.
It’s hard to distinguish between natural and learned mixed handedness. Why do I use scissors with my right hand? Is it because that’s my natural preference, or because my preschool teachers told me to? I don’t remember.
I also don’t remember the first time I used a mouse. Did I use my right hand because it was natural, or because it’s what everyone else was doing?
I’m also not sure how they decide what’s left and right handed for some things. I’m looking at a Washington Post article that shows two examples of left handed former presidents (it was written when mixed lefty Barack Obama was running against strong lefty John McCain). There’s a picture of George H.W. Bush gesturing with his left hand. OK, that’s a clear sign of left handedness. But then there’s a picture of Bill Clinton holding a microphone in his right hand and pointing with his left. That doesn’t exactly scream “Lefty!”
How do we know that pointing is more important than holding a microphone? If he gives a speech knowing that he’s not going to point, does he hold the microphone in his left hand? If you drive with just your left hand on the steering wheel, is that because you’re left handed, or because you’re keeping your dominant right hand free for more important things, like your Big Gulp in the cup holder? If you play golf the “right handed way,” are you really right handed, or could you just want your dominant left arm in front?
Anyway, back to this Handedness test. Go ahead and take it before reading these questions, so I don’t bias you.
- Writing and drawing are listed separately. Does anyone use different hands for them?
- When do you use a knife without a fork? What do you think they’re going for here? I thought about baking a loaf of bread and then slicing it. But might someone use the other hand in a knife fight?
- In the first version I saw, the broom task was listed as “using a broom (upper hand is dominant) or brushing one’s hair.” That seems a bit strange. Does anyone use different hands for these?
- Also, the jar task was listed as “opening a box or a jar lid.” Does anyone use different hands for these?
- It says you’re mixed handed if you do even one task with the other hand. The exception is a left hander using scissors with their right hand, because scissors are often designed for right handers. First, is that true? Do any left handers here use right handed scissors for ergonomic reasons? Second, if scissors aren’t a reliable indicator, then why are they on the test?
I’m curious to hear who uses what hand for what. Leave your score below if you want to, and share any interesting handedness stories you might have. The test gives the breakdown between the different types (left and right, strong and mixed) in the U.S. population. I wonder if there will be a similar breakdown among my readers.
For way, way more mixed-handed goodness, check out my ebooks Ambidextrous (for right-handers) and Ambisinistrous (for left-handers).