Only About 1% of People Are Truly Ambidextrous: 7 Things Scientists Have Learned

The post Only About 1% of People Are Truly Ambidextrous: 7 Things Scientists Have Learned first appeared on Crafting Your Home.

Most people have a preferred hand. For roughly 90% of people, that preference is the right hand, while about 10% are left-handed. A much smaller group has been described as ambidextrous, meaning they can use both hands with little or no overall preference. One large population study estimated this group at around 1%.

But there is an important catch: ambidexterity is more complicated than simply being comfortable using both hands. Researchers distinguish true ambidexterity from mixed-handedness, in which a person uses different hands for different activities.

True ambidexterity is much rarer than most people think.

Researchers generally use the term ambidextrous for people who can perform tasks with either hand without a strong overall preference. Mixed-handed people, by comparison, may prefer one hand for certain activities and the other for different tasks.

The famous 1% figure is an estimate, not a universal rule.

But studies don’t always produce the same percentage.

For example, one study of 716 people classified 3.3% as ambidextrous using its particular questionnaire and criteria. A Finnish study of more than 30,000 adults found that 3.5% of singletons and 3.4% of twins reported being ambidextrous as children.

Being able to use both hands doesn’t mean both hands are equally skilled.

Research on handedness therefore uses different questionnaires and performance tests rather than relying on a single activity such as writing.

Mixed-handedness is different from ambidexterity.

Imagine someone who writes with the right hand but prefers the left hand for certain sports or household tasks. That person may be described as mixed-handed rather than truly ambidextrous.

Scientists have pointed out that a single question about writing hand can miss these differences. Broader handedness questionnaires examine preferences across several activities.

Hand preference begins developing surprisingly early.

Research indicates that hand preference becomes established during early childhood, while observations of fetal behavior suggest that aspects of lateral preference can appear before birth. Researchers have also identified left-right differences in the developing nervous system very early in development.

Genes appear to play a role, but they don’t explain everything.

A large genetic study estimated that common genetic markers explained only part of the variation in left-handedness and ambidexterity. The researchers also noted that how scientists measure handedness affects what they can conclude.

People can become more comfortable using their weaker hand.

Practice can improve performance with the non-preferred hand. This is particularly noticeable in activities where people routinely train themselves to use both hands.

Research involving ophthalmologists, for example, found that people who identified themselves as ambidextrous represented a much larger proportion of that professional group than the roughly 1% figure commonly reported for the general population. The researchers suggested that some participants may have been describing trained ambidexterity rather than naturally occurring ambidexterity.

So, How Rare Is True Ambidexterity?

Around 1% is a commonly cited estimate for people with no clear overall hand preference. Still, other studies have produced higher figures when they use different definitions or rely on self-reporting.

What scientists can say with greater confidence is that handedness exists on a spectrum. People aren’t neatly divided into only “right-handed” and “left-handed.” Some have strong preferences, some have weaker preferences, some are mixed-handed, and a small proportion can use both hands with little apparent preference.