A good way I’ve found to reach this state is to start to describe a concept in your internal monologue but “cancel” the monologue right at the start—the concept will probably have been already synthesized and will just be hanging around in your mind, undescribed and unspoken but still recognizable.
I’ve had this happen to me semi-accidentally, the resulting state is extremely unpleasant.
I’ve had this happen to me semi-accidentally, the resulting state is extremely unpleasant.