Best scientific research 2022


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BEST SCIENTIFIC
RESEARCH - 2022 
254 
So, this topic is relevant, since we know a lot about left-handers and almost nothing. 
It is human nature to be wary of everything that falls out of the picture of universality. In our 
time, not alertness, but interest, the desire to understand left-handers and learn more about 
them, understanding the naturalness of differences - this, apparently, is the way of a civilized 
attitude to the phenomenon of left-handedness. The aim of this article is to learn the reasons 
of being left-handed and the problem of this article is to find out their cognitive abilities and 
prepare them to life. The reason of left-handedness can be different and till this day scientists 
have more than 50 hypotheses and we can highlight minimum 3 of them which are actual 
nowadays. Genetic left-
handedness can be inherited not only by male’s line but also by 
fem
ale’s line. In twenties, it was proven that probability of having left-handed child from right-
handed parents is only 2%, if one of the parents is right-handed it can be increased by 17%, 
but if both parents are left-handed vulnerability of having same child increases by till 46%. 
The large-scale researches claim that left-handedness depends on gender as well and left-
handed men are more than women. They argue that prenatal hormones play a role and the 
high level of testosterone might lead to an increased chance of left-handedness which is 
more experienced in boys. However, during the experiment scientist cannot prove it totally 
because there are many other hormones that could potentially affect left-handedness. In 
addition, others believe that the environment is the main cause of being left-hander. 
Nonetheless, some researchers believe that handedness has more of an environmental 
influence than genetic or the role of gender. The environmental factors in womb including 
exposure to hormones may effect on whether we favor the right or left hand in life later. Even 
experiment showed that mother’s stress during fetal period can effect on forming child 
handedness. The visual scans showed that when mother experiences stress, child in the 
womb shakes his left-hand which can be early stages of forming handedness. The second 
effect of environment can be modeling when child has left-handed friends around him where 
he can copy their actions like using left-hand during activities, writing or eating. The third 
one is adjustment, when child in early age has to be left-handed because of injury or 
accidents, sure this change can lead to further handedness. Of course with being different 
with handedness, studies show that they have perfect brain organization and a zone of 
corpus callosum, which is responsible for the interaction of the cerebral hemisphere, is well-



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