dominant in one hemisphere

Did you know that according to studies, only 10% of the human population is left-handed? The rest, 90%, are all right-handed! So who or what decides whether someone will be left-handed or right-handed? Is it just nature’s fault? Genetics and evolution etc.? Or is it just because of mere chance?

The simple answer to that age-long question is, no one knows for sure. 

These days, researchers have focused their attention on a more tangible question—the question about what differs between left-handed and right-handed people. Surely, there must be something in their physiology that makes them write with their left or right hand.

Well, thanks to Paul Broca and Roger Sperry, we now know for a fact that that something is called brain lateralization, or hemispheric dominance.

Hemispheric dominance (aka Brain Lateralization)

Everyone has their strengths and weaknesses. However, in neuroscience, that is quite literal. In simple terms, the strengths are actually ‘specialties’ of one of the brain’s hemispheres. Conversely, things that the same hemisphere does not ‘specialize’ in are its weaknesses.  

This phenomenon—where certain traits are characteristic of one hemisphere, and other traits are characteristic of the other hemisphere—is called brain lateralization, or hemispheric dominance. Either of the two hemispheres is mostly found to be dominant in the majority of the human population.

Fun fact: Some people are neither left-brained nor right-brained, and the proof is in the fact that they can write with both hands! They are called ambidextrous. Only 1% of the human population is ambidextrous.

One’s brain is said to be ‘lateral’ since one hemisphere faces the other. Hemisphere is the scientific term for the ‘side’ of the brain. According to a well-known, often-discussed fact, the right ‘side’ of the brain hemisphere is responsible for controlling, coordinating, and managing activities performed by the body’s left side. Similarly, the left hemisphere is in charge of the body’s right side. 

So, when someone uses their right hemisphere more than the left one, science dictates that they be referred to as right-brain dominant, right-hemisphere dominant, or simply right-brained. They tend to be right-handed as a result.

Conversely, when someone makes more use of their left hemisphere than the right one, it means they are left-brain dominant, left-hemisphere dominant, or simply left-brained. They tend to become left-handed or ‘lefties’ as a result.

Other indicators of hemispheric dominance

Left- or right-handedness is a somewhat exaggerated, commonly-known indicator of a person’s hemispheric dominance. When a left-handed person is spotted, the first thing that pops into others’ minds is probably that They must be right-brained or ‘They must be more creative and smarter than me (assuming the observer is right-handed).

Interesting read: The claim that left-handers die earlier than their right-handed counterparts is false! It was first put forward in a flawed 1980s study conducted in California, US. Later studies proved this not to be the case at all. Similarly, the claim that lefties are smarter and/or creative is also an overstatement. Research has shed further light on this in recent years, too.

However, handedness—whether someone writes with their left or right hand—is not the only visible, obvious indicator of someone’s hemispheric dominance. You can tell whether someone is left- or right-brained by many other indicators, too. Let’s look at some of them below.

Indicators of right-hemisphere dominance:

The right hemisphere of the brain is concerned with the following main functions:

  1. Visual intelligence – This includes the ability to recognize and recall faces, as well as find similarities between different faces. Right-brained people might also tell apart, say, 720p graphics from 1080p better than their left-brained counterparts can. They also appreciate visual arts on a higher plane of thought than left-brained people do.
  2. Emotional intelligence – Right-brained people prefer emotions over facts. That is not to say they aren’t logical, factual beings. They process (express, read and recognize) emotions at a more ‘self-aware’ mental level than left-brainers. They also express emotions more vocally, creatively, and clearly than left-brained people. That is also related to their next intelligence, which has to do with language.
  3. Linguistic intelligence – Right-hemispheric dominant people differ greatly in their process language (verbal plus non-verbal). When talking about non-verbal communication, visuals also fall under this category. As mentioned above, visual intelligence is also a forte of right-brained people. Ask a right-brained person you know to talk about their day, and ask the same from a left-brained person. Note down the difference in their language: use of vocabulary, tone, stress patterns, length of sentences, etc. 
  4. Creative intelligence – This is a reflection of all other intelligence types listed above. Therefore, in right-brained people, the ability to create permeates everything they do in life. Creating music, visual art, poetry, and being imaginative are commonly observed indicators of someone being right-brained.

All-in-all, emotions, arts, and languages are the areas right-hemisphere dominance excels in. That is not to say it cannot perform, say, logical, mathematical functions. It sure can, as we shall see in detail later below. However, the extent to which right-brained people use any of these functions largely depends on the kind of task they are engaged in. But their strengths lie in the four aforementioned areas. 

Indicators of left-hemisphere dominance:

Following are the main functions the left hemisphere is responsible for: 

  1. Logic – Left-brained people are very logical. This does not mean they kick their feelings to the curb or remain reserved. They are not emotionless creatures! They prefer one over the other in daily activities, decision-making, and problem-solving tasks. Got a problem no one else can find a way out? Go to a left-brained person, and they might get you out of the rut with a logical, thoroughly thought-out plan of action.
  2. Critical thinking – This is, of course, the other side of the same coin, logical thinking. Left-brained people are logical and critical thinkers. They tend to consider facts, statistics, research, and the like to form an opinion about something or before passing out advice to others.
  3. Numbers – Where right-brained people are good at memorizing and recognizing faces, left-brained people are just as amazing at memorizing numbers, dates, and the like. Although good memory was thought to be a specialty of right-hemispheric dominance, it is still equally great in both left- and right-brained people.
  4. Reasoning – Because they tend to incline more towards logical, factual, critical, and mathematical skills, left-brained people tend to differ as such in their reasoning ability, too. They tend to be better at maths, debates, analytical problem solving, and things involving technical descriptions too. 

Interesting read: Some things people do in everyday life can also indicate whether they are right- or left-brained. They are simple differences between right- and left-brain dominant people.

Hemispheric dominance and lifestyle

People tend to differ in the kind of professions they choose, the kind of hobbies they enjoy, the places they like to visit, and everything else…right down to their sense of humour, too!

A right dominant hemisphere lends that person to become professionals like artists, musicians, writers, dramatists, directors, photographers, and the like. Left-brain dominance lends people to go into fields like engineering, mathematicians, scientists, lawyers, accountants, computer programmers, etc.

Fun fact: Some famous left-brained people include Michael Jackson, Halle Berry, Alicia Keys, among many others! More interesting yet, some famous lefties that you probably didn’t know were lefties, including Leonardo da Vinci, Alber Einstein, and Angeline Jolie, among others.

Hemispheric dominance and brain symmetry

Brain symmetry is an important aspect when it comes to hemispheric dominance. When something is said to be symmetrical, it means it is made up of the same parts. And those parts face each other on the same axis or plane (either horizontally or vertically). 

People who are neither left- nor right-brained are said to have a symmetrical brain…such as Einstein. On the other hand, people with one hemisphere dominant over the other are said to have an asymmetric brain. Even though their brain anatomy does include two hemispheres facing each other, they are considerably different regarding their functions. 

Symmetrical Brain – An Anomaly?

There is a thick, muscular band of nerve fibres called the corpus callosum that divides the two hemispheres. Information passes from one hemisphere to the other via this ‘road’ in the middle of the hemispheres. In symmetrical brains, the callosum is too narrow or thin, and as a result, the passing of information occurs more smoothly. 

Such people, in turn, tend to be neither left-brained nor right-brained. No one hemisphere in their brain is dominant over the other. Both work in the same way. This allows for greater creativity, more critical and analytical thinking. However, its downside is that a narrow/thin division between the hemispheres also allows mental dysfunctions to develop easily.

In other words, the advantage becomes the disadvantage, too, in symmetrical brains. Since there is no dominance, there is no localization of functions in either of the hemispheres. Both work equally tirelessly to keep the person healthy, strong, smart, and creative…and that, in itself, a disadvantage. Delocalization of brain functions stresses the organ out overall. 

Perhaps that is why a touch of genius comes with a touch of madness. Multiple real-world examples, including Einstein and others like him, are proof of that.

Check it out: Take MentalUp’s online survey test to determine whether you are left- or right-brain dominant. It’s free, fun, and easy!

Hemispheric dominance – Myth or Fact?

You would be surprised to find out the amount of research that claims hemispheric dominance is a myth. That there is never a time when someone used just one hemisphere. That we use both sides of our brain almost all the time. However, there is a grain of truth in this claim, too. There are certain tasks in everyday life where a person is making use of both hemispheres equally.

Bear in mind, though, that this is not a question about fact vs. fiction. At the end of the day, it all boils down to a simple factor: the kind of activity the brain is involved in. 

According to a 2008 PLoS Biology study, some daily life tasks involve the use of both hemispheres at the same time, such as language production. Correct grammatical forms and prosodic features (intonation, stress patterns, etc.) are combined to create comprehensible speech. This combination results from both hemispheres working together. There are two ways this happens, though:

  • both hemispheres work together at the same time; simultaneity
  • control switches from one hemisphere to the other; alternation

In light of the aforementioned facts, it is safe to assume that, yes, complete hemispheric dominance is an exaggerated phenomenon. It is more like a spectrum. It begins with simple tasks that require no hemispheric dominance. And it ends on things where either of the two hemispheres is used greatly. In other words, it isn’t an all-or-nothing situation, as many seem to think it is.

Conclusion

The two sides of the brain are called hemispheres. Someone is said to be right-brain dominant when they use their right hemisphere more so than the left one, and vice versa. There are also cases where a person lacks hemispheric dominance; they make equal use of both hemispheres. Both left- and right-brained people possess strengths and weaknesses that differ from each other.

Handedness is a common indicator of hemispheric dominance. However, there are other qualities a person exhibits that can indicate whether they are left- or right-brained. The fact that one hemisphere is dominant over the other implies that a person’s brain is asymmetric; a lack of dominance means it’s symmetrical. 

Many myths are circulating in the scientific and non-scientific world when it comes to hemispheric dominance. However, new research is released every day in this area. And it is shedding light on the myth and what is a fact when it comes to hemispheric dominance and other factors related to it.

The majority of the human population is left-brained (90%), whereas only 10% are right-brained, and fewer still (1%) are ambidextrous. 

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