Left -handed people could be at greater risk of some neurological disorders: study

Left and safe neurological disorders He could go hand in hand, a new study revealed, although researchers and others recognized potential limitations.

While about 10% of people in the world are left -handed, People with autism There are 3.5 times more likely to have the feature, according to an international team of researchers who analyzed data from more than 200,000 people.

The study, published in the Psychological Bulletin magazine, indicated that the left and mixed hand also appears more often in people who have diagnoses such as schizophrenia, autism and intellectual disability.

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The mixed hand refers to a situation in which people can use their left hand for a certain task and their right hand for others, according to psychology experts.

This is slightly different from ambidexterity, which is the same use of both hands.

“The key conclusions of this study are that the alterations in the preference of the hand of the norm (that is, the right hand) are especially associated with the psychiatric and psychological conditions that affect the linguistic system (e.g., eg.

He is a researcher at the Institute of Cognitive Neuroscience at the University of Ruhr Bochum in Germany.

“The correlation does not imply causality, and being left -hander does not mean that someone develops autism or schizophrenia.”

Not all neurological conditions showed a link with the dominant hand of people.

Depression and discalculia (a disability of mathematical learning), for example, did not show a significant difference in the preference of the hand compared to the control groups, according to the study.

Language factor

The researchers also determined that the “atypical hand” may be associated with long -term linguistic symptoms such as stuttering and dyslexia.

“In most people, the dominant side of his brain It is typically where speech, language, logical thinking processing and hand preference is found, “Dr. Earnest Lee Murray, a neurologist at West Tennessee Medical Group, told News Digital.

He was not involved with the new study.

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“People who are left -handed or ambidiestras often do not have a unilateral brain so dominant, rather, the key parts of language can be divided between both sides,” Murray said too.

The study also examined the probability of atypical delivery in clinical populations, or groups of people diagnosed with a specific set of health conditions compared to a control population.

“We suspect that the left and mixed hand could be associated with disorders whose symptoms are related to language,” said Packheiser in a press release on the study.

“Language, like the hand, has a very unilateral location in the brain, so it is logical to reason that the development of so much and its disorders could be linked.”

Time is key

The researchers also considered other factors that could go into play, such as the age at which a person could exhibit symptoms.

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It seems that the previous one Symptoms of disorder It emerged, the researchers most frequently saw cases of left and mixed hand.

The researchers raised the hypothesis that the left and mixed hand could be associated with diseases that occur very early in life, because the dominant hand is determined at a very early age, possibly even Before birth.

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In the uterus, the gestation of 10 weeks is closely linked to which the hand will be preferred later in life, they said.

The connection could potentially help experts to understand the way in which the brains are organized and how they develop.

“The study has implications by understanding the ways of ending the neurorrehabilitation of patients with unilateral brain conditions, such as stroke, such as stroke, Multiple sclerosis Or traumatic brain injury, “Murray said.

Potential limitations

Jonathan Alpert, Psychotherapist and Author based in Manhattan, said the study was “interesting”, although he emphasized his limitations.

“The correlation does not imply causality, and being left -hander does not mean that someone develops autism or schizophrenia,” said Alpert, who did not participate in the study, News Digital.

“The hand is only one of the many factors that can be associated with neurological features, and these findings must be interpreted with caution to avoid unnecessary alarms or stigma.”

Alpert asked for more research to understand the relationship, if there is, between hand and mental health.

The main author Packheiser agreed that the results are “purely correlational.”

“We have no causal evidence that developing a psychiatric disorder linked to language or neurodevelopment causes a change in hand, or if changes in hand cause some disorder,” he told News Digital.

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“Therefore, people from the general public should never be alarmed if your child prefers to use the left hand,” said the researcher.

“But given the increase in mental disorders in the population, it is important to understand them better.”