In Chapter 1 of Dr. Penfield’s book the author wrote, “. . . that the engram of experience is a structured record within the brain.”
The structure of the record consists of linguistic neural codes about which I speak extensively in my two books. The codes are maintained in memory, and we are learning how dynamic the memory of the brain is, consisting of spike trains of action potentials retained in specific regions of the brain to be called upon by intention, attention and will.