So when the left brain is stronger the right hand will be strong and the person may be right-handed the left half controls speaking so a person with a strong brain may become a good speaker professor lawyer or salesperson A person with a strong left brain may have a strong idea of time and will probably be punctual the person may be strong in math and logic and may like to plan things ahead He or she may be practical and safe. If something happens to the left side of the brain the person may have problems speaking and may not know what day it is. The right side of his or her body will become weak.