There is a difference between the soul the mind and the brain. The brain is what controls your physical body. It keeps you breathing, your heart beating, your eyes blinking. It controls everything you don't have to think about.
The mind and the soul are not physical things. The mind is what causes you to think. It allows you to plan and prepare. The soul is what makes you, you. It holds your personality and your essence. Without your soul you wouldn't be human, at least not in my opinion.
I hope this answered your question. Also, judgment comes from the mind.