Left-handedness and divergent thinking

My son, Ainan, 7, is left-handed. Curious to what degree left-handedness may contribute to his creative, prodigious gifts, I have been doing some research. What I have found is of interest to any parent of a left-handed person, anyone who is left-handed, or anyone who is interested in the nature of giftedness, talent and genius.

A study by Dr. Stanley Coren entitled: "Differences in Divergent Thinking as a Function of Handedness and Sex" in The American Journal of Psychology, Vol. 108, No. 3 (Autumn, 1995), pp. 311-325 doi:10.2307/1422892 looked into the matter of whether left-handedness had any association with divergent thinking, and how this was correlated with the sex of the left-handed person.

Various tests were administered to the subjects. Test 1 concerned Alternate Uses; test 2 was of Object Synthesis and Test 3 was of Ideational Flexibility. The final test was a test of convergent thinking (traditionally measured by IQ tests).

There was no correlation between left-handedness and performance on the Alternate Uses test. However, on the second and third tests (which were both measures of kinds of divergent thinking), there was a strong, positive correlation between left-handedness and performance in the test. Interestingly, the more left-handed (or sinistral, as it is termed, scientifically) the subject the better their performance in these tests. The fourth test of convergent thinking was also revealing in that there was no benefit to sinistrality in this test: subjects of both left and right-handedness performed similarly.

This experiment shows that left-handers have a distinct advantage in tasks involving divergent thinking, compared to right-handers - but show no difference in their ability to handle convergent tasks.

What, practically speaking does this mean? Well, one conclusion, that is glaring for me, is that conventional tests of ability of left-handed kids, might overlook their gifts. You see, IQ tests only address convergent thinking ability. Left-handers have a strength in divergent thinking. Thus testing for gifted programmes and the like would tend to underestimate the left-handed children because their strength - divergent thinking - will not reveal itself in conventional testing. Thus a gifted child, in the truest sense of the word, might be overlooked if they are left-handed, for they will have a hidden talent, not obvious to the conventional tests.

This evidence that left-handed people are stronger in divergent thinking agrees perfectly with what I have observed in Ainan since his birth. He has a very strong aptitude for divergent thinking (allied to a very strong aptitude for convergent thinking, too, I might add). This divergence of thinking shows itself in everything that he does - he is always coming up with new ideas and new ways and new understandings, while learning, observing or just thinking aloud to me.

Interestingly, history has many examples of good divergent thinkers who were left-handed: Leonardo da Vinci, Isaac Newton, Albert Einstein, Picasso, and H.G. Wells, for instance. It is telling that the two greatest physicists of all time, should both have been left-handed. Curious, that.

So, if your child is left-handed, do not be concerned, be happy - or even excited. Left-handedness confers a strength in divergent thinking that equips the gifted child to think in new and better ways. Such a child may grow up to do many things not open to the conventionally gifted child whose strength is convergent thinking alone.

By the way, Stanley Coren's study showed NO correlation between handedness and divergent thinking for girls. This correlation only applied to the boys.

(If you would like to read more of Ainan Celeste Cawley, 7 years and 8 months, a scientific child prodigy, or his gifted brothers, Fintan, 4 years and 1 month, or Tiarnan, 18 months, please go to: http://scientific-child-prodigy.blogspot.com/2006/10/scientific-child-prodigy-guide.html I also write of gifted education, IQ, intelligence, genetics, left-handedness, child prodigy, child genius, baby genius, adult genius, gifted adults, and gifted children in general. Thanks.)

International Left-Handers Day: August 13th.

Today marks an international celebration of left-handedness.

Left-handedness is found in about 7 to 10% of the population. Throughout history, left-handers have been subject to suspicion and marginalization in many cultures, yet recent research has pointed out some interesting gifts that left-handers possess.

To be left-handed is to be different in more fundamental ways than the hand which you choose to write with: it goes deep into the very wiring of the brain. A left-hander's brain is visibly different in form and structure than a right-handers. These differences are critical to understanding the fundamental differences between left and right handers.

Normally the brain, which is divided into two halves in almost all humans (in some cases it is fused, I understand), consists of two different sized halves. For a right hander, one half is larger than the other. For a left-hander, this disparity is not seen: the two halves of the brain are of similar size. There is a good reason for this that we will get onto in a minute.

The left-hander also has a thicker corpus callosum - the bridge that connects the two halves of the brain- than a right-hander. This affords the left-hander greater communication power or "bandwidth" between the left and right halves of the brain. This is key to understanding the advantage that a left-hander holds.

When the brain is confronted with a difficult challenge: either a fast or a hard task, or one that has multiple stimuli at the same time, one half of the brain may easily become overwhelmed. Here is where the left-hander wins. You see when confronted with fast and or multiple stimuli, the left-handed brain will recruit processing power from the other half of the brain. The left hander will share the task across its two fairly equal hemispheres. In this way, the task load on one hemisphere is reduced and the task is more easily overcome. Right handers don't do this well. They rely on the power of their dominant hemisphere to handle the task and are not so good at recruiting assistance from their other brain hemisphere.

Thus, in fast-moving, challenging domains, the left-hander is superior to the right hander. This may be seen in sports, gaming or in any situation that has multiple stimuli. Particular - and critical cases - of this would include fighter pilots - or indeed civilian pilots, in which they are faced with the simultaneous input of a large amount of information in which all must be dealt with at the same time.

In simple terms, the left-hander thinks quicker than the right hander, when the task demands much of them.

It should be noted that this innate advantage for the left-hander will only be noticeable when it is called upon. In slow-moving tasks, without multiple stimuli, the advantage that left-handers possess will not be seen. However, put two people in a situation in which they are pushed to handle a lot of information at the same time - and the left hander of the two, will shine. The right hander will quickly get overloaded by the excessive mental workload.

So, perhaps it is time to acknowledge the gifts of the left-handers among us. Some cultures still find it difficult to accept them as they are, and still encourage them to use their right hand, like "everyone else". This is a mistake. The left-hander is fundamentally not like right handers. They are neurologically and distinct - and have something unique to offer us all.

A left-hander is best for any task that requires a high-throughput of multiple stimuli. So that is where they should be - in fast, hard, demanding roles, with much happening at the same time. That is where they can best make their most natural contribution: the one that plays to their strengths.

This strength of left-handers is commonly known as being good at multi-tasking. So, if it is a multi-tasking role - let the left-handers, handle it.

As careful readers of this blog will already have noted, Ainan, 7, my son, is a left-hander. Most of the rest of the family is mixed handed (ambidextrous) in some way. I will write more of this topic in future.

So, if you have a left-handed child don't adopt the concern of the right handed culture in which we live, that it is somehow unacceptable or problematic: it is not. Left-handedness, as now understood, is a kind of gift in and of itself. It is a misunderstood blessing - so be happy.

This new understanding of left-handedness was written of in an article in the journal Neuropsychology, by the Australian National University researcher Dr Nick Cherbuin. It was published in November 2006.

(If you would like to read of my left-handed son, Ainan Celeste Cawley, a scientific child prodigy, aged seven years and eight months, or his gifted brothers, Fintan, four years and one month, or Tiarnan, eighteen months, please go to: http://scientific-child-prodigy.blogspot.com/2006/10/scientific-child-prodigy-guide.html I also write of gifted education, IQ, intelligence, genetics, child prodigy, child genius, baby genius, adult genius, savant, the creatively gifted, gifted adults and gifted children. Thanks.)