Those terms suggest a continuum where, for example, the solution to being overstimulated might be to just be in a dark quiet room for a while. And sometimes that does help! But I find it's much more helpful to think of the continuum as one between "bad stimulation" and "good stimulation". These terms also aren't great, because "bad stimulation" can be something fun like spending time with people that nevertheless cooks your bean a bit. But the point is that you can counteract it with experiences that are stimulating in ways you expect and can control, like a hot shower or a favorite food or music you know inside and out.
