Shubotai
04-26-2020, 08:15 PM
Recently, a research by Oxford University identified four genes that are associated with handedness and brain language regions.[1] The research wasn't ground-breaking but it added some new elements in handedness and right-left brain language knowledge. There was also an older research by the Ruhr University in Bochum regarding this subject that is also worth-reading, proposing that left or right orientation is determined early by the spinal cord in the fetus before the brain and the limbs formulate.[2]
It should be noted that there are more than 40 genes which determine handedness and orientation and that each one of those is only responsible for a minimal shift towards either direction. The prevailing view is that both come from a universal source, while there is statistical correlation only between specific genes and handedness in persons with certain medical conditions, like schizophrenia. So handedness is a very complicated subject and it will be a very long time before any conclusive evidence is gathered, in contrast to ancestry and historical migrations where autosomal and haplogroup science has revolutionized the statistical data.
Handedness should be effectively independent of eyedness. Occular dominance can be determined with one of a number of tests like distance hole-in-the-card or near convergence test.
I am mixed left and right handed and right eyed. My R1a side is left-handed and mixed-eyed. The K2b mtdna side is right-handed and strongly right-eyed.
Are you left-handed or right-handed? What kind of handedness comes with your haplogroup? Would you rate high your language dexterity?
1. Handedness, language areas and neuropsychiatric diseases: insights from brain imaging and genetics (https://academic.oup.com/brain/article/142/10/2938/5556832), Akira Wiberg et al
2. Epigenetic regulation of lateralized fetal spinal gene expression underlies hemispheric asymmetries (https://elifesciences.org/articles/22784), Sebastian Ocklenburg et al
It should be noted that there are more than 40 genes which determine handedness and orientation and that each one of those is only responsible for a minimal shift towards either direction. The prevailing view is that both come from a universal source, while there is statistical correlation only between specific genes and handedness in persons with certain medical conditions, like schizophrenia. So handedness is a very complicated subject and it will be a very long time before any conclusive evidence is gathered, in contrast to ancestry and historical migrations where autosomal and haplogroup science has revolutionized the statistical data.
Handedness should be effectively independent of eyedness. Occular dominance can be determined with one of a number of tests like distance hole-in-the-card or near convergence test.
I am mixed left and right handed and right eyed. My R1a side is left-handed and mixed-eyed. The K2b mtdna side is right-handed and strongly right-eyed.
Are you left-handed or right-handed? What kind of handedness comes with your haplogroup? Would you rate high your language dexterity?
1. Handedness, language areas and neuropsychiatric diseases: insights from brain imaging and genetics (https://academic.oup.com/brain/article/142/10/2938/5556832), Akira Wiberg et al
2. Epigenetic regulation of lateralized fetal spinal gene expression underlies hemispheric asymmetries (https://elifesciences.org/articles/22784), Sebastian Ocklenburg et al