What Causes A Person To Be Left Handed

Sex slightly more boys than girls are left handed.

These differences can affect the right and left sides of the spinal cord differently which would cause left handed and right handed individuals. Researchers believe that our handedness tendency to be right or left handed is determined in the womb. Researchers who study human hand preference agree that the side of the preferred hand. In a rather satisfying plot twist it seems that your left or right handedness is actually ingrained in your biological workings from before you were born but in the form of a particular hubbub.

Clare porac a professor of psychology at pennsylvania state university who studies handedness explains. Previous studies have found that people with psychosis had a 20 percent likelihood of being left handed though a small study in the journal sage found the rate of psychotic lefties may be even. The majority of humans are right handed a whopping 85 90 and this makes sense our right hand is controlled by the left hemisphere of the brain which is responsible for speech and writing. But according to scientists at ruhr universitat bochum the spinal cord determines one s dominant.

For a long time scientists have tried to find out why left handed people are so rare. Being a righty or a lefty could be linked to variations in a network of genes that influence right or left asymmetries in the body and brain president barack obama is left handed as well as at. Left handed people as a result of this asymmetry also have larger corpus callosum a thick band of nerve fibres in the brain that divides the left and right hemispheres of the cerebrum. Watch the video or read below to find out more.

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This part is actually 11 percent or 25 million nerve fibres larger in lefties and causes communication between their two brain hemispheres to be faster. However more recent research suggests it is more likely that lots of different genes add up to produce a left handed person. Previous research has suggested that left handedness is due to genetic differences in the brain.