| I would suggest getting more comfortable/ familiar with the people you're jamming with.
There is a small group of musicians I feel completely confident sitting down and jamming totally uninhibited with (maybe a dozen or so). I honed my jam-a-bility (lol) with them for nearly a decade now. Basically what I'm saying is, the more you play with a group of people the more you're able to read their body language or even without be able to anticipate a change.
Now with most other musicians I'll jam with I'm able to predict to an extent when something is coming up by listening and feeling the overall vibe. I'm not nearly as confident with others but I've been able to take the experience with my tight "group" and carry it over with new musicians.
You could always talk it over with the band mates, tell them to really get into the feel and let it happen. Try to find landmarks in the jams that you all can become familiar with, it doesn't have to be the same, but you can usually feel out when a bridge or a place to step out and do your thing will present itself.
I will also double what Zappstorius said, give gestures, look at eachother and just feel it out.
It might not sound so pretty at first, but the more time you spend with a group of people the more cohesive the group will become.
Aside from that, there are just certain people I can not hone in on. Not to say they are not good musicians or vice versa but more so the chemistry just isn't there.
So now that I've said far to much and most likely not very followable, spend more time with these people and feel it out.
Body language is your friend, before you know it you'll be jamming and coming up with some great stuff.
Also try and record the jams some how if you can... from a computer, to a small tape recorder stached in a location in the room where it picks up well.
It'll help you listen to it from another perspective and get a feel for the others.
Hope I shed some useful light.
Peace
-Ben
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RIP: Mouthful of Birds. Free EP's
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