This part is most likely the deciding factor for your hand

German experts have recently published scientific evidence showing that not only the brain, but this part plays an important role in deciding your left and right handed.

Scientists have long been intrigued by the brain lateralization theory to explain why there are left-handed, right-handed people.

However, recent research by scientists at the University of Bochum in Germany shows that not only the brain but also the spinal cord plays an important role in deciding your hand.

Accordingly, genetic activity in the spinal cord causes asymmetry since you are still in the womb, thereby causing an imbalance of the two hemispheres.

Ultrasound images from 1980 have provided evidence, whether left-handed or right-handed should be determined from the time you were in the womb, as early as the 8th week of pregnancy.

Research shows that from the 13th week of pregnancy, the fetus in the womb tends to favor sucking on the left or right fingers.

The arms and hands are dominated by the motor cortex , so scientists always look at asymmetric gene expression in the cortex to understand and explain why the appearance of this dominant hand formed early on.

At the same time, the scientific community studies what has happened independently in the spinal cord and its relationship with handedness. They observed gene expression on the spinal cord of human fetus in the middle of the 8th and 12th weeks of pregnancy.

Accordingly, the researchers found the difference between the number of genes shown on the right or left side of the spinal cord during the eighth week.

Interestingly, this difference has been seen in the segments of the spinal cord - functioning to control the movements of the arms and legs.

In addition, the team also discovered that environmental factors can control gene expression through so-called epigenetics - whose task is to identify genes that are turned on or off.

The study also found that through epigenetic factors, environmental factors can also cause additional gene activity on one side of the spinal cord compared to others.

This is just a preliminary study and it is still too early for us to draw any conclusions. But it is certainly new fascinating evidence that scientists will investigate further.

With so many questions why are left-handed, right-handed, or left-handed people really a genius? - whether this handedness will affect life later - all probably will be fully explained in the future.

This study was published in eLife magazine.