The left hemisphere, which controls the right hand, likes rapidly-changing sounds like consonants, while the right hemisphere, which controls the left hand, likes slowly-changing sounds like syllables or intonation.
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.
Lefties make up only about 10 percent of the population, but studies find that individuals who are left-handed score higher when it comes to creativity, imagination, daydreaming and intuition. They're also better at rhythm and visualization.
-Counting how many people are left-handed is more difficult than it looks, because of variations in preference and skill from task to task and because of left-handers having been forced to write with their right hand, but the best estimate we have is that roughly 10% of the world population is left-handed.
Similar results were also reported by a recent study that investigated left-handedness in the UK Biobank study, a large dataset with about 500,000 participants (de Kovel et al., 2019). Here it was found that in the UK, 8.6 percent of women and 10.6 percent of men were left-handed.
A study in The Journal of Nervous and Mental Disease suggested that those who are left-handed are more prone to negative emotions. It also found that when processing emotions, lefties have a greater imbalance in activity between the left and right brains.
According to a small study published in the Journal of Nervous and Mental Disease, lefties are more prone to having negative emotions. In addition, they seem to have a more difficult time processing their feelings. Again, this seems to be related to the brain-hand connection.
All three candidates for president in 1992 were left-handed: Bill Clinton won. Bill Clinton President from January 20, 1993 – January 20, 2001, is left-handed. Barack Obama President from January 20, 2009 – January 20, 2017, is left-handed.
You may have heard that left-hand dominance is a sign of a learning disability. Rest assured, in most cases, left-handedness is a normal part of child development. While it is possible for left-handedness to coexist with learning disabilities or other health concerns, this is the exception and not the rule.
There has been research over the years that has found the percentage of stutterers who are left handed is much higher than the general population but that was not specifically linked to forced hand change (and would depend whether the people who had been changed were still classed as “left-handers” in the research!).
Do left-handed people have more learning disabilities?
A series of new studies show that left-handed people are more likely to suffer from learning disabilities, stuttering, migraine headaches and, according to the latest findings, autoimmune diseases, like ulcerative colitis, myasthenia gravis and celiac disease, in which the body attacks its own tissues.
Various surveys have found that the highest incidence of left-handedness is in Western countries. The Netherlands, the USA and Canada lead with around 13 per cent of the population being left-handed and the UK is only just behind.
According to a recent survey, lefties are 71% more satisfied in the sack than righties. Of the 10,000 people surveyed, 86% of left-handed people reported being “Extremely Satisfied” with their sex lives, compared to just 15% of righties.
Can 2 right-handed people have a left-handed baby?
A straightforward genetic link hasn't been proven, and it is possible for two right-handed parents to have a left-handed child. Theories include: Genes – perhaps genetic factors predispose a child to favour the right hand. A single gene might be passed from parents to children to influence which hand a child favours.
Supposedly, late 19th-century ballparks were laid out so that the pitcher looked in a westerly direction when facing the batter. The throwing arm of a left-handed pitcher would then be to the south-hence the name southpaw.
So was her great-grandson, King George VI. King George was born left-handed, but he was also trained to write with his right hand. His left-handedness shone through when he played tennis and held the racket in his left hand. His wife, Queen Elizabeth, the Queen Mother, was also left-handed.
But handedness has its roots in the brain—right-handed people have left-hemisphere-dominant brains and vice versa—and the lefties who claim Einstein weren't all that far off. While he was certainly right-handed, autopsies suggest his brain didn't reflect the typical left-side dominance in language and speech areas.
The results, published in Frontiers, show that left-handers outperformed the rest of the sample when the tasks involved difficult problem-solving, such as associating mathematical functions to a given set of data.
Specifically, in left-handers, the motor cortex in the right side of the brain (the left side of the body is controlled by the right side of the brain, and vice versa) is dominant for fine motor behavior. In contrast, in right-handers, the left motor cortex is better at fine motor tasks such as writing.