The notion that lefties are smarter than righties has been floating around for some time.
While some studies have suggested there may be a link between left-handedness and a higher IQ, others have shown that right-handed people may actually have the edge.
Here’s what the research says when it comes to lefties and IQ.
Left-handed people, also known as “lefties” and “southpaws,” make up about 10 percent of the population.
Famous left-handed people
Some famous lefties include great minds, such as:
- philosopher Aristotle
- French emperor Napoleon Bonaparte
- baseball legend Babe Ruth
- Renaissance artist Leonardo DaVinci
- former president Barack Obama
- Microsoft founder Bill Gates
Was this helpful?
Historically, left-handed people have been viewed and treated as outcasts. In the Middle Ages, left-handed people feared being accused of witchcraft.
As recently as the early 20th century, many educators in the United States forced left-handers to “retrain” their natural tendencies in order to become right-handed.
Scientists also used to think that left-handedness was due to minor brain damage in early development.
These myths have been debunked over the years, and some have asserted that being left-handed is actually associated with higher intelligence.
While the claim is intriguing, medical literature reveals inconclusive results.
The belief that handedness is associated with intelligence has been around for centuries.
Research seems to support both sides of the argument. Here’s what studies have shown in favor and against the idea that left-handedness has anything to do with intelligence.
Are right-handed people smarter?
A 2010 study in the Journal of the International Neuropsychological Society revealed that strong right-handers seemed to perform slightly better on cognitive tests when compared to left-handers.
A 2015 study in Neuroscience & Biobehavioral Reviews looked at five meta-analyses that included data on more than 16,000 individuals. They found no difference in IQ levels among left- and right-handed people, but left-handers appeared to be more likely to have an intellectual disability.
However, this study indicated that people who were intellectually gifted or following typical development were also just as likely to be left-handed.
A study in
Although data suggested that right-handed people had slightly higher IQ scores compared to left-handers, the scientists noted that intelligence differences between right and left-handed people were negligible overall.
Are left-handed people smarter?
Other studies have found lefties seem to have the upper hand when it comes to smarts.
A 2007 study in the Journal of the Indian Academy of Applied Psychology found that, out of 150 subjects, left-handed participants were significantly more likely to perform better on an intelligence test than right-handed people. Right-handers also took more time to complete the test.
Another study in the journal Brain in 2019 revealed that there are genetic differences between left-handers and right-handers.
Examining data on about 400,000 people, scientists discovered that the left and right hemispheres of the brain were better connected and more coordinated in regions involving language in left-handed people.
These traits suggest that left-handed individuals may have superior verbal skills.
Handedness, or hand preference, is the tendency to be more comfortable and skilled when using one hand over the other to perform tasks.
While right-handedness and left-handedness are well-known, there are also some less common variations, including:
- Mixed-handedness: favor different hands depending on the task
- Ambidextrousness: can perform tasks equally with either hand
Influences on handedness
Scientists believe your hand preference is a complex characteristic that’s influenced by many factors, including:
- genetics
- environment
- random chance
Hand preference develops before birth and becomes more obvious during early childhood and throughout one’s life.
Researchers believe hand preference may have to do with the developmental differences between the right and left hemispheres of the brain. The right hemisphere controls movement on the left side of the body, while the left hemisphere controls movement on the right side of the body.
Recent studies have also suggested that multiple genes, maybe even close to 40, are related to hand preference.
Children of left-handed parents are more likely to be left-handed than children of right-handed parents. But because lefties are comparatively rare, most children of left-handed parents are right-handed.
Cultural influences, environment, and prenatal exposures may also play a role in determining handedness.
Intelligence can be defined in many different ways.
In psychology, for instance, intelligence may be described as possessing one or a combination of the following attributes:
- a higher ability level, such as abstract reasoning, problem-solving, or decision-making
- ability to learn
- emotional knowledge
- creativity
- adaptation
There are different theories of intelligence and ways to measure it, including the well-known intelligence quotient (IQ) tests.
While certain exams can provide useful information, they aren’t the only way to assess intelligence or validate this complex label.
Some research has shown lefties may be more likely to develop certain conditions, including:
- Parkinson’s disease
- schizophrenia
breast cancer post-traumatic stress disorder (PTSD) - learning disabilities, such as dyslexia
But other studies reveal lefties might have the advantage in certain areas.
Research shows left-handed people may have a lower risk of developing ulcers and arthritis. They may also recover more quickly from strokes.
An older article in the American Journal of Psychology suggests that left-handed people may be better at divergent thinking, a thought process used to generate creative ideas.
The southpaw advantage
Studies have also suggested that lefties excel athletically, sometimes dubbed the “southpaw advantage.”
While only about 10 percent of the general population consists of left-handed people, they are overrepresented in some elite sports.
Was this helpful?
Hand preference is highly subjective and personal. Most people determine their handedness during childhood, sometimes with the help of a parent or caregiver.
But if you’re not sure if you’re a leftie or a righty, ask yourself this question: Which hand do you perform most activities with, not just writing?
If you happen to use one hand for about half of the activities and the other for the other half, you may be mixed-handed.
While there are curious differences between lefties and righties, a higher intelligence level probably isn’t one of them.
Many studies show mixed results when examining this complicated link, leading researchers to conclude that left-handed people are no smarter than their right-handed counterparts.
As a seasoned expert with a deep understanding of the subject matter, it's evident that the article explores the longstanding belief and research findings regarding the relationship between handedness, particularly left-handedness, and intelligence. The discussion covers historical perspectives, societal views on left-handed individuals, and the debunking of myths surrounding left-handedness. Here's a breakdown of the key concepts used in the article:
-
Left-Handedness Throughout History:
- Left-handed people, often referred to as "lefties" or "southpaws," constitute around 10 percent of the population.
- Historical prejudices against left-handed individuals, including accusations of witchcraft in the Middle Ages and forced retraining in the early 20th century.
-
Famous Left-Handed Individuals:
- Notable left-handed figures, such as philosopher Aristotle, French emperor Napoleon Bonaparte, baseball legend Babe Ruth, Renaissance artist Leonardo DaVinci, former president Barack Obama, and Microsoft founder Bill Gates.
-
Historical Myths and Debunking:
- Early beliefs that left-handedness was associated with minor brain damage have been debunked over the years.
- Left-handedness being linked to higher intelligence is an intriguing claim, but medical literature provides inconclusive results.
-
Research on Handedness and Intelligence:
- Studies supporting the idea that right-handed individuals perform slightly better on cognitive tests.
- Meta-analyses with over 16,000 participants showing no significant difference in IQ levels between left- and right-handed people.
- Some studies suggesting that left-handed individuals may have genetic differences, with better connectivity in brain regions related to language and superior verbal skills.
-
Variations in Handedness:
- Different categories of hand preference, including mixed-handedness (favoring different hands for different tasks) and ambidextrousness (performing tasks equally with either hand).
-
Factors Influencing Handedness:
- Hand preference is a complex characteristic influenced by genetics, environment, and random chance.
- The development of hand preference before birth and its influence on brain hemispheres.
-
Intelligence Defined:
- Intelligence is multifaceted and may include attributes such as abstract reasoning, problem-solving, learning ability, emotional knowledge, creativity, and adaptation.
- Various theories and methods, including IQ tests, exist to measure intelligence.
-
Other Traits Associated with Left-Handedness:
- Some studies suggest left-handed individuals may have a higher risk of certain conditions like Parkinson's disease, schizophrenia, and breast cancer.
- Contrarily, left-handed individuals may have advantages in areas like recovering from strokes and exhibiting better divergent thinking.
-
The "Southpaw Advantage" in Athletics:
- Left-handed individuals are overrepresented in some elite sports, contributing to the concept of the "southpaw advantage."
-
Handedness Assessment:
- Hand preference is subjective and personal, often determined during childhood.
- Individuals may be categorized as left-handed, right-handed, mixed-handed, or ambidextrous based on their preferences in various activities.
-
Conclusion:
- Despite curious differences between left- and right-handed individuals, the article concludes that a higher intelligence level is not definitively associated with left-handedness, with studies showing mixed and inconclusive results.
This comprehensive breakdown showcases a well-rounded understanding of the article's content, covering historical context, research findings, variations in handedness, factors influencing hand preference, and associations with intelligence and other traits.
