The soul is technically a combo of your spirit and your mind/brain, but people disagree on this so spirit and soul often get used interchangeably in speaking.
You cannot detect the spiritual with the physical, though there can sometime be similarities in how they feel (spiritual tingles, the silent voice/thought language, your mind's eye). You would have an easier time seeing with your ears, though, then truly finding the spiritual via the physical. Spiritual characteristics are things like intentions and emotions. Satan's favorites are doubt, fear, and especially pride. God's are things like "love, joy, peace, forbearance, kindness, goodness, faithfulness, gentleness and self-control," to extrapolate from Galatians 5:22-23. The brain helps modulate and translate the spiritual into the physical, but it isn't the real source of our intentions and emotions. Dreams often are a good example of the same thing, with our mind connecting physical representations to things our spirits are experiencing or connecting to.
If you really want to recognize the spirit, your best bet is to ask God to show you. If you don't really want to see the truth of it, you won't though; the spiritual is most likely subtle by design