Comment: the stream of consciousness is not just an asthetic technique, but it is also a mean of representing ideological possessions.
If we switch "posessions" to obsessions or fixations, then I would tend to agree that stream-of-consciousness can be an effective means toward demonstrating personal and/or cultural ideas that, for whatever reasons, occupy a heightened position in the consciousness.
The narrative technique itself can be construed as a respresentation of a western obsession with "individual psychology" as championed by Freud and perpetuated across the arts in the 20th century.
Although "stream of consciousness" is a literary device which could have a provenance in many psychological venues, its origin is most accurately attributed to Virginia Woolf. Woolf used the device with success and precision as she revealed not only the inner thoughts of her characters to her readers, but the thoughts of the readers themselves as they played voyeurs to the "unsuspecting" characters.
However, this device, when well-crafted, is more than a collection of inner thoughts. It is also a sophisticated meta-cognitive device which helped to inform us how we think and how we learn and how we process information.
I would be interested to know more about what you mean by "ideological possessions" so I could comment on your question in a more specific manner.
Stream of consciousness is a literary technique that authors use. It is a succession or stream of ideas that come from a character without regard to organization or logical arrangement. An example would be if someone sat down and wrote down their random thoughts as they occurred.
This technique reveals ideological possessions, as you call it, because it is someone's raw thoughts just as they run through someone's mind. It is "unedited," therefore, it reveals a character's purest thoughts, as well as their thought process at the time:
The writer attempts by the stream of consciousness to reflect all the forces, external and internal, influencing the psychology of a character at a single moment.