I tend to lift the right eyebrow and lower the left. However, I find it's habitual, and I can trend away from it if I focus on it. - There's also the gaze avoidance thing, but that's already covered ITT. This is much easier to trend away from, I find. - Actually, I think that stopping your gestures whilst having hit a stutter might qualify as secondary, but if we consider that gestures mostly follow that which is spoken, it stands to reason that a pause will be introduce, before the rest of the speech arrives. So, perhaps it's not secondary as such, but merely "collateral". Not sure if there's such a distinction available in stutter litterature, nor if there needs to be (in case it's conceivable as simple logical consequence).