Your incoming--How do you process what's offered?
Your choice: should you come to that meeting, read those articles or go to this event? Should you have those expensive medical tests, have surgery or hire that consultant?
If someone stands up and shares a big idea, some people might run with it, others might not hear it at all.
If you're eager for change, every bit of information and every event represents an opportunity to learn, to grow and to change for the better. You hear some advice and you listen to it, consider it (possibly reject it), iterate on it and actually do something different in response.
On the other hand, if you're afraid of change or in love with the path you're on or focused obsessively on your GTD list, then incoming represents a distraction and a risk. So you process it with the narrative, "how can this input be used to further what I've already decided to do?" At worst, you ignore it. At best, you use a tiny percentage of it to your advantage.
Going to a brainstorming meeting with that attitude is a recipe for failure. Someone in the meeting needs to shout, "Put down your spreadsheets and come out with your hands up!"
If you've already decided, if you have an incoming process that involves deflector shields, if you are too busy to do a reset, then the best path is not to take the meeting at all. Don't pay attention to test results and don't look for new learning.
Don't bother accepting new input if you have no interest in using it. (I happen to think that once you're committed to your path, this is in fact a brilliant approach. Halfway up Everest, it makes no sense to have a discussion about climbing K2 instead.)
