Do you mean why do people have a dominant hand?
People learn how to write etc from their parents, so whichever hand they use will likely be the one you use. It takes hundreds of times of doing an action to wire your brain to be able to master the action, but you can practice switching hands to get more equal skill for both hands. Most people just don’t do this, probably because I imagine it takes longer to develop the skill.
Growing up using just one hand for mastering those tasks creates neural pathways and doing the task repeatedly strengthens those pathways, so when you suddenly try to use the other hand for the same task, your brain doesn’t have the same development of those specific neural pathways, causing one hand to be more dominant.
Latest Answers