Oh wikipedia, you have everything! This graph does a good job of explaining how I feel during raids.
For Wrath I decided to get back into raiding behind the curve. My guild was already in Naxx and I was new to the guild on top of that. Overall the challenge level was in the middle (many will say the challenge level was nil) and my skill level (read armor into as well) was low. So yes I worried about how I'd do.
We moved on to Malygos and Sarth, and not to mention achievements like undying and immortal so I moved into the anxious territory.
When the guild went into a meltdown I moved over to a new guild. They were around the same progression as my previous guild, but overall they weren't as good. So suddenly I could, but didn't have to perform as well. I think this would fall into the Arousal area.
But eventually we kept doing the same stuff, not really moving forward or being capable of doing hardmodes to reach new stuff. So we never reached the Flow level. We were at Control mode, which is as much fun as this graph would make it seem.
The only thing I don't agree with is Relaxation, Boredom and Apathy.
When my skill and gear outgrow a dungeon, I move from boredom to apathy. But it looks like I should be moving over to the Relaxation phase.
When skill is high and challenge is low, I'd rather not be there at all.
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