When doing hypnoanalysis with ideomotor signals, an important signal to set up is “If something crosses your mind that you want to tell me, or you want to ask a question, just raise your hand (extend patient’s wrist) and we’ll talk.”
A patient will not ordinarily initiate speech while in trance (Thing 57), but has no problem with a motor signal. Much significant free association goes on during trance, and the time to access it is while it is occurring, not at debriefing. In fact, much of it is lost once the patient is alerted and back into left brain processing.