Sentence:  The opening paragraph of the chapter titled The Theory Of Representative Perception , in the book Philosophies Of Science by Albert G. Ramsperger says , `` passed on to the brain , and there , by some unexplained process , it causes the <WSD>mind</WSD> to have a perception '' . 
Meaning of the word marked with <WSD> tags:  that which is responsible for one's thoughts and feelings; the seat of the faculty of reason