What do you do when you notice an assumption?
Part of the challenge is to notice what you usually do. An indicator of something that is "sticking out" that may eventually become some sort of problem is a signal. Usually when people notice this, it more often means they must "shore up" or "justify" the need for their conclusion or assumption, reinforcing the circle and reapplying their "remedies" that are really keeping the circular problem in place.
Because their focus is on the content as being more important, they cannot see the larger picture of how they are caught in a repeating pattern. They only experience that some part of the pattern is working in the ways they intend, when it is really an out-of-control pattern that MUST repeat whether the person wants it whenever the trigger is pressed for the habit to "go off." I would say that there are "endorphin squirts" that occur in pressing the trigger originally, but often the experience of the squirting may not register any more because it, too has become habitual.
If you take away the need, I believe our systems "self correct". You do not have to "do" anything but experience the lack of need, then just wait and watch yourself. What happens next will tell you quite a bit about everything you have been experiencing. If you just get the familiar justifications for your habits, just stop again and wait. Each time you stop, your senses will wake up a little more as you take the next layer of the habitual assumption off. It seems that people are naturally sensitive underneath layers of habits.
That's why stopping yourself when you would have normally started talking is such an effective technique in Dialogue - or in any conversation. Listening will tell you more than talking, for obvious reasons. You merely interrrupt yourself right when you found a need to say something and watch what happens in yourself. You question your motive of wanting to talk, because there will be usually be feelings and needs underneath the assumptions.
So if you don't know what these feelings are or they don't surface because they are the submerged part of the iceberg, you can find out what they are by stopping yourself from going into the habit repeatedly. My experience has told me that there is often more than one need/motive/justification. Sometimes these are tricky to uncover, because the remedy of the assumption is trying to cover it up by answering the need. So this is where Dialogue comes in - you put yourself in a situation where this issue comes up again and again - and you watch what happens in yourself each time you notice the reaction.
Tammy, pictured here is an Alexander student of mine who has the rare ability to challenge her assumptions and do something different about them. Perhaps you have some more characteristics of how to notice assumptions - or you might have more 'tips' of what to do when you do notice these assumptions? I'd love to hear about them.