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MYTHS 4

04/07/2018

MYTHS 4
Demonstration of the Falsehood of the Myth
Refutation of cause 2: Higher percentage of accidents in left-handers for living in a world of right-handers.
It is shown that left-handers have greater skill with the right hand than right-handed ones with the left. And that is precisely because living in a world of right-handers. The explanation is simple: Since the left-hander is born he has to acquire certain skills with the right hand that he did not originally possess. We must not forget that the ability to perform a task with a certain hand is not only influenced by genetics (dominance of the cerebral hemisphere) but also by the environment. Just like when we start cycling, our ability to keep in balance develops, or when we start to learn to swim we unconsciously learn body motor coordination to stay afloat and move forward. Thanks to this ability to develop the skill of the right hand our risk of accidents is very low. And it is practically level with the right-handers since they have not acquired that skill in the left hand. When they are forced to perform a delicate task with both hands or exclusively the left-handed they are the most disadvantaged.
Refutation of cause 1 (Life expectancy less than left-handed in the past) and 3 (Scientific research of 1991):
I have commented above that the scientific research that was carried out in 1991 is a clear example of what should never be done in such a study.
This research was based on secondary sources of information, one of the shortcomings of this type of research is that you must be very critical of the information you select, because if not, you arrive at totally erroneous results. It is not the same as conducting an investigation with results that you yourself have collected.
They made a VERY fat mistake when selecting the information and obtained as a result that the lefties lived 9 years less than the right-handed ones. The method consisted of seeing through the secondary sources of information the age at which left-handed and right-handed people died.
The results were the following: - Left-handed people died at a mean age of 66 years. -The right-handers died at an average age of 75 years.
Does someone already guess where the error may be and what they did not see?
As I said in Case 1, left-handers were persecuted and not long ago they were forced to use their right hand. Therefore, the percentage of lefties was much lower a few years ago. However, at present this percentage has increased because there is already freedom to choose the hand that we want to use and because we are no longer persecuted. What does this entail in the study?
That the data that was collected in 1991 on the age of death of the lefties was very low. Why? Because people who died at an early age were left-handed from times with lower life expectancies. If we add that these early deaths were within an increase in the population of young left-handers with a longer life expectancy for the reasons explained above, we have a nice myth of lower life expectancy. Here we see an example of how a bad scientific study has been the origin.
Of course, many studies later emerged that realized the error and obtained balanced results of life expectancy between left-handed and right-handed people. Why did not they get as much publicity as the previous study? No idea, perhaps the results were not so "shocking" and therefore it was not interested in advertising. To say that left-handed and right-handers have the same life expectancy is not "news". Therefore, as a culmination to this entry, two well-conducted scientific studies, which shows that, indeed, there is a lower percentage of left-handed as we age. And that that influenced the life expectancy studies of the lefties.
Is forced dextrality an explanation for the fall in the prevalence of sinistrality with age? (PDF) Handedness and longevity: archival study of cricketers.
Do left-handers die sooner than right-handers? Commentary on Coren and Halpern's

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