“Seth material” search engine (Jane Roberts)

These ghost images provided stimuli for mental, spiritual, and physical experience. That answers your question, I believe.

(12:19.) In the sleep state after our last session, then, he allowed his consciousness to expand enough so that it became aware of information and experience usually censored automatically through mental and neurological habit. In Adventures Ruburt uses the term “prejudiced perception” — an excellent one — that is applicable here. For you have prejudiced yourself spiritually, mentally, and physically in those terms. In the sleep state Ruburt became unprejudiced, at least to some degree, so that he encountered information that seemed alien or out of context with usual experience.

Now I am able to obtain information that Ruburt, in his terms, does not have. In other terms he does have it, and so do you, but you have been mentally, spiritually, and biologically prejudiced against it. As a race, you are ready to become more aware of your greater reality, however, and to explore its “unknown” aspects. Period. Hence this book.