No, there is no policy unique to this kind of question, if I understand what kind of question you're trying to use this as an example of. (There is a meta-question about neurobiology questions though: http://meta.cogsci.stackexchange.com/q/23/4086)If the question were off-topic for some clear reason that at least five people (or one moderator) would endorse, it could be put on hold for a custom reason, but I don't see any reason to consider this off-topic.

I don't think "trivia" is a motive, much less one that is distinct from "learning or knowledge sharing", nor do I see a need for concern about users' motives when they are not particularly disruptive. If you feel the question is not useful, you may wish to downvote. Of course its clarity and specificity deserves as much scrutiny as any other question, so those are options for flagging/voting to close too, but I don't see any need in this case, personally.

No, there is no policy unique to this kind of question, if I understand what kind of question you're trying to use this as an example of. (There is a meta-question about neurobiology questions though: https://cogsci.meta.stackexchange.com/q/23/4086)If the question were off-topic for some clear reason that at least five people (or one moderator) would endorse, it could be put on hold for a custom reason, but I don't see any reason to consider this off-topic.

I don't think "trivia" is a motive, much less one that is distinct from "learning or knowledge sharing", nor do I see a need for concern about users' motives when they are not particularly disruptive. If you feel the question is not useful, you may wish to downvote. Of course its clarity and specificity deserves as much scrutiny as any other question, so those are options for flagging/voting to close too, but I don't see any need in this case, personally.