Sentence:  As a result of this <WSD>bicameralism</WSD>, they were not conscious as we are today, and had no unified sense of self. 
Meaning of the word marked with <WSD> tags:  Ambiguous misnomer for Julian Jaynes's theory of bicamerality, probably never used by Jaynes, rarely used in academic literature based on his work, but often found informally (compare "bicameral mind" and "bicameral mentality"):