Some Informational Dimensions of Embedding in Japanese made a thorough investigation on the informational structure of Japanese and argues that the roles of wa and ga lead us to consider another informational dichotomy, one distinguishing given ([+GIVEN]) information from new ([−GIVEN]) information. It is shown that the informational property crucial to syntactic analysis in Japanese is in fact the dichotomy between given and new information rather than that between topic and comment. The data reveal that informational properties in terms of givenness condition Raising in Japanese.
　　The data reveal that raised sentences have unraised counterparts containing wa, contrastive or noncontrastive, and contrastive ga while unraised sentences containing noncontrastive ga lack raised counterparts. In view of the fact that the embedded sentences with wa and contrastive ga consist of two information units and that those with noncontrastive ga consist of one information unit, it is proposed that those embedded sentences consisting of a single information unit assigned the value either [+GIVEN] or [−GIVEN] may not undergo Raising.