what if it doesn't depend on the exact right kind of fiction, but the content of the fiction its fed meaningfully shifts (the probability of) what attractor it ends up in, following a feedback loop involving more fiction?
if something like this depends on fiction, then the dependence is likely not exact, but rather the shape of influence that things like fiction generally have on minds. True stories are likely to have influence as well. Think of how human minds, tides of history, economies, etc are influenced by stories.