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What is the difference between the right and left sides of the brain?

It is assumed that the left side is more creative and artistic and the right more organized and logical. But that's how it is?

What is the difference between the right and left sides of the brain?
What is the difference between the right and left sides of the brain?

Popularly there is this belief that the hemispheres of the brain represent different characteristics, the left more artistic and the right more logical. The truth is that science says that there is no control of the right or left hemisphere. In a study published in the journal PloS One, a team of scientists or served the brains of more than 1,000 people and found no evidence of significant differences in the domain of the hemispheres of the brain between individuals.

However, there are differences between the hemispheres. It is possible that there is not one half more dominant than another, but our brain is divided into two hemispheres and they are not the same. They are very similar and redundant, since most of the processes that we will find on the left side are also performed on the right side and vice versa, but they are not identical.

Both sides of the brain have “the ability to express appropriate feelings, appetites and impulses, the ability [of] learning, memory, logic, etc., the ability to maintain adequate thresholds and tolerance to frustration and failure, and to recover quickly from its effects, the ability to maintain effective and well-modulated defense reactions (ie, repression, denial, simulation, rationalization, blame, abstinence, fantasy, obsessive-compulsive behavior and body reaction patterns involving food, respiration, metabolism , etc.), “according to the book ” Disorders of the Nervous System: A Primer “ in which the authors cite Harold Wolff, one of the great brain scientists of the twentieth century.

Despite the density of text, the conclusion is simple: almost everything related to what makes us human, exists on both sides of the brain. 

Do you need proof? If we extract a hemisphere of a 3-month-old baby’s brain, a surgery that doctors sometimes perform in cases of severe epilepsy and other disorders, that baby can still grow up with normal memories and a normal personality. The hemispherectomy has been carried out “hundreds of times” in the last century, according to Scientific American magazine.

So, what is the difference between the two hemispheres?

In general, The left side of the brain controls the right side of the body, and the right side of the brain controls the left side of the body. Everything is complicated for vision: the nerves on the left side of both eyes are connected to the left side of the brain, and the nerves on the right side of both eyes connect to the right side of the brain.

Where does the myth of the creative side and the analytical side come from?

In the 19th century, a pair of neuroscientists, Pierre Paul Broca and Karl Wernicke, discovered that people who ‘struggled’ with language processing tended to damage specific areas on the left side of their brains. The researchers concluded that these two areas were important for language processing, announcing to the world that language lived in the left hemisphere. This idea is probably the root of this notion that the left brain is more creative and the right brain is more analytical.

Later, Robert Louis Stevenson’s novel “The Odd Case of Dr. Jekyll and Mr. Hyde” helped spread the idea of ​​the left and right brain in popular culture.

However, the asymmetries found by Broca and Wernicke are not consistent from one brain to another and, in about 5% of right-handed people, the key centers of language processing are on the right side of the brain, and in 30% of left-handed people, these centers are on the right side of the brain. In addition, in most people, both hemispheres participate in some aspect of speech. People who have damaged the left hemisphere can relearn speech using the right hemisphere.


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