Kant- External Experience and internal experience

On pages 72 and 73 Kant talks about external experiences and internal experiences.  If I'm reading this right when he says external he means our bodies (takes of space) and internal is our soul.  I think this subject goes back to something I learned in Psychology.  Some people believe the mind and brain work together and are aware of each other but others think one works and not the other.  I think they both work together.  Our mind thinks what were gonna do or has thoughts and judgements and the brain is what actually does it.  They both have a connection to each other.