The proficiency to be more professional and confident using one hand instead of the other for activities such as writing and throwing a pitch is called handedness.
Handedness begins to develop before birth. Handedness is inheritable and evident from early childhood. handedness is related to variations between the brain's right and left halves (hemispheres). The<em> the left hemisphere regulates the action of right side of the body while right hemisphere controls movement on the left side of the body</em>.
So in handedness, one half of the brain regulates more skilled motor action.
