I tend to ruminate on specific patterns individuals display and other little curios, "I" or "me" doesn't exist in my mind so it's rare that I'm included in my line of thought, I tend to have to take my traits and build a person I can analyse from them to figure myself out which often leads to very inaccurate results, therefore, I don't often think about my interactions with people....perhaps I should, but I'm usually all about the person, I absolutely love talking to people who have unusual patterns and listen to them, I feel myself "charging up" from their enthusiasm and as a result I tend to love passionate/energetic people, oddly enough I think of others when the patterns of one individual match up with another and I learn the reason for the person behaving like that, I look for the motivation behind the pattern. Unfortunately I find it difficult talking about everyday things without it sounding stilted, it's weird but to have a successful conversation with someone that isn't about something abstract I have to think ahead and have a list of topics to talk about. My mind is more like an laser beam than light hitting a multifaceted prism, I think I only break the laser beam style thinking when I'm creating something abstract or get caught up and emulate another....bit of a shame really because I think I come off really serious most of the time.
As with what TDHT said, I'll think about an individual when I start thinking about an object that has traits that remind me of someone....I guess I'm pretty person orientated in that way but otherwise I'm focused on whatever it is I'm doing at the time......and by focused I mean procrastinating whilst trying to will myself to do something that I know would be beneficial lol.
Often when someone tells me they've been thinking of me I feel quite grateful about it...I guess it's reassurance? but really I just think it's nice, as for myself I don't often tell people I've been thinking about them because I guess it makes me feel a little vulnerable and perhaps a little nuts. I honestly don't wonder if a person thinks of me, it just doesn't occur to me.