Abstract: This paper first analyzes the definitions and characteristics of introversive perception and extroversive perception,then demonstrates that brain possesses the capability of perception and is the subject of perception.From that arrives a viewpoint that mental phenomena are the content of introversive perception of brain.By analyzing intentionality,a conclusion is drawn that objective things are the intentional objects of extroversive perception of brain,which,as a superior visual angle to look upon the mind-body relationship,can solve relevant difficult theoretical problems.

Key words: introversive perception, brain, mental phenomena, extroversive perception, intentional objects