I've recognized this phenomenon in myself in the last several years, but I never articulated it this well. I would just tell people that I had a "one-track mind," and that even though I find myself analyzing things a lot, it tends to gravitate towards whatever I happen to be working on most.<p>I have observed this several different times in my life: When I thought I was in (actually out of) love in high school, that was all I could think about, and I put out a ridiculous amount of poetry describing my "anguish". At various times I got caught up with different games: Everquest, Chess, Minesweeper, Battle for Wesnoth, Poker, and Chess again; at each point, I found myself spending all my leisure time on a single game, and all of my idle thoughts considering different opening sequences, or mine layouts, or starting hands: whatever was applicable to current "addiction". When I have been in relationships, I find that I tend to be consumed with not only the small disputes (as pg describes), but with things like "sweet" things I can do or say to make my s.o. happy -- thoughts tend to drift toward planning, anticipation, reconciliation, and any number of other difficult bits that are part of a serious relationship. At various points I have also found myself wrapped up in technical things like math, physics, computer science, and startups in general. And lately my top idea has been the nature of life, human relations, introspection, and psychedelics.<p>So for me, it basically seems to be whatever is currently consuming the majority of my consciously-used brain power. Some social problems are hard and require a lot of brain power to try to solve. The same goes for philosophical or cash flow problems. Of course, topics in math or science or engineering are most likely to take up this brain power, but for me at least, those are the things that I tend to procrastinate on the most.<p>So even though I find myself inclined to consume my top idea space with relevant technical stuff, I tend to nudge those out of my mind when I'm thinking consciously, instead focusing on more immediate topics (entertainment, socializing, paying bills). The worst part is that I <i>know</i> that if I'd only restructure my free time to actually work on worthwhile things, I would see my productivity increase many-fold due to the "Top Idea Effect". I'm really not sure what's stopping me from doing that.