Lefties At Higher Risk of Developing Mental Disorders

Poor lefties. It's not enough that they get teased in school playgrounds growing up, but it turns out that being left-handed also mean having increased risks of developing mental disorders:

Left-handedness appears to be associated with a greater risk for a number of psychiatric and developmental disorders. While lefties make up about 10% of the overall population, about 20% of people with schizophrenia are lefties, for example. Links between left-handedness and dyslexia, ADHD and some mood disorders have also been reported in research studies.

The reasons for this aren't clear. Scientists speculate it could be related to a concept known as brain lateralization. The brain has two halves. Each performs primarily separate, specialized functions, such as language processing, which mainly takes place in the left hemisphere. There is lots of communication between the hemispheres.

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@Heroh -

Because only 10% of the general population are left-handed. So, you'd expect that only 10% of people with schizophrenia are left-handed but in reality, the number is twice that.

So another way of looking at it again is that if you're left-handed, your risk of developing schizophrenia is twice as high.
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"...about 20% of people with schizophrenia are lefties". So 80% of people with schizophrenia are righties?
Why should lefties be afraid of having mental disorders again?
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My brother is a leftie. I'm pretty sure any propensity to mental disorders is directly caused by the trauma of lefties having to use right-handed scissors in grade school. He was very distressed by it. I found it hilarious.
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