>>1644
It's possible, but it requires an interface for it. As in, you need to be aware of it and be able to treat it as communication. Normally when someone is trying to manipulate your thinking they'll intentionally try to speak to your subconscious, but ironically this makes it easier to determine someone is talking to you (at least for me) because the things they say clash with your normal thinking. Someone who's friendly with you may not be noticed as easy because they don't stand out when calling your attention.