Our brain can be divided into two hemispheres, the left and the right.
Most people would say a person is left-brain or right-brain. But this does not mean the person is using only one side of her brain. It means the person’s dominant use of the brain is left or right.
If you are the freedom type who like to imagine and dislike a lot of thinking and planning, you are more of the right-brain type. And those who tend to talk more and whose language expression is good can be classified as left-brain.
But again, it may not be accurate by just observing a certain aspect of what the person tends to do. To be more accurate, we need to consider more aspects.