Righty or lefty? The fate of your hands was decided when you were a foetus!
A new study suggests that the preference for moving the left or right hand in a human being develops when they’re still in the womb, from the eighth week of pregnancy.health and fitness Updated: Feb 20, 2017 13:24 IST
Are you a lefty? Do you use your left hand for major activities such as writing or eating? Or, like the majority of people, are you prone to using your right hand more?
Whatever the case is, turns out that the fate of your hands was decided when you were still in your mother’s womb!
A new study published in the journal eLife says that a preference for moving the left or right hand develops in the womb from the eighth week of pregnancy. From the 13th week of pregnancy, unborn children prefer to suck either their right or their left thumb.
According to ultrasound scans carried out in the 1980s, a preference for the left or the right hand might be traced back to asymmetry. These results fundamentally change our understanding of the cause of hemispheric asymmetries.
To date, it had been assumed that differences in gene activity of the right and left hemisphere might be responsible for a person’s handedness.
Arm and hand movements are initiated via the motor cortex in the brain. It sends a corresponding signal to the spinal cord, which in turn translates the command into a motion.
The motor cortex, however, is not connected to the spinal cord from the beginning. Even before the connection forms, precursors of handedness become apparent. This is why the researchers have assumed that the cause of right versus left preference must be rooted in the spinal cord rather than in the brain.
The researchers analysed the gene expression in the spinal cord during the eighth to 12th week of pregnancy and detected marked right-left differences in the eighth week—in precisely those spinal cord segments that control the movements of arms and legs.
Another study had shown that unborn children carry out asymmetric hand movements just as early as that. The researchers, moreover, traced the cause of asymmetric gene activity.
Epigenetic factors appear to be at the root of it, reflecting environmental influences. Those influences might, for example, lead to enzymes bonding methyl groups to the DNA, which in turn would affect and minimise the reading of genes.
As this occurs to a different extent in the left and the right spinal cord, there is a difference to the activity of genes on both sides.
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