It currently seems to me like everything which is suffering fits this pattern, though I'm not sure if all the things which fit this pattern are suffering.

If I'm working on a complex problem or playing a difficult game, my attention may be drawn to several things at a time, but this doesn't cause suffering. I'm uncertain of whether this is because my attention-allocation systems are sufficiently well coordinated to "take turns" in that situation, or because a certain component of emotional urgency is lacking. I'm guessing the latter, because Buddhist-style detachment (one of the non-content-focused methods mentioned) seems to be very useful in avoiding suffering. On the other hand, multitasking for longer periods does make me feel worse.