…and that under certain favorable circumstances there may be this complete recall and in recent years the eminent Canadian surgeon Penfield has done very interesting experiments in his brain operations. Most of these operations were performed on people who had…

…after which the operation can be performed without any pain on the brain itself. But while the patients were on the table, Penfield would touch certain areas of the temporal lobe with a very tiny electrode and would evoke a complete recall of incidents…