Explore the intricate workings of the hippocampus in this 31-minute lecture by Jim Knierim from Johns Hopkins University. Delve into the concepts of pattern separation and completion within hippocampal subregions, examining their roles in memory formation and cognitive mapping. Learn about expansionary coding, maze cells, and the challenges faced in understanding these neural processes. Gain insights into how the brain creates and retrieves memories through summary statistics and pattern completion. Conclude with a Q&A session to further clarify complex neurological concepts presented throughout the talk.