Sentence:  In the following pages I shall demonstrate that there is a psychological technique which makes it possible to interpret dreams, and that on the application of this technique every dream will reveal itself as a psychological structure, full of significance, and one which may be assigned to a specific place in the <WSD>psychic</WSD> activities of the waking state. 
Meaning of the word marked with <WSD> tags:  Relating to the psyche or mind, or to mental activity in general.