Sentence:  Freeman , Cameron and McGhie , in their description of the disturbances of <WSD>thinking</WSD> found in chronic schizophrenic patients , say , in regard to condensation , that `` the lack of adequate discrimination between the self and the environment , and the objects contained therein in itself is the prototypical condensation '' . 
Meaning of the word marked with <WSD> tags:  the process of using your mind to consider something carefully