In "The Perpetual Now" Lemonick explores what we know about memory through the case of Lonni Sue, a woman who had viral encephalitis which was cured after severe brain damage, primarily in the temporal lobe (hippocampus). She lives in a "perpetual now" as she cannot retain or make memories. Lemonick discusses what we have learned about memory from her and other famous cases, primarily HM or Henry Molaison. Through these cases he describes that we've learned about "types" of memories and where they are created/how they are stored, etc.
Although I am not a lay person, I think this book is written rather accessibly to the average reader and it accurately sums up what we know from these specific medical cases. The field of memory research is much larger than clinical cases, but these individuals did give many of the clues and information about what we know about how the brain handles memories today. As a psychology and neuroscience major, I have read about these cases throughout my education. I still find more in-depth explorations, such as through this book, fascinating, but I did not learn anything new from this book. For the scholar, this is a summary, but I think this book is targeted for and will be more informational to the lay person (someone with limited knowledge about these clinical cases/memory).
Overall, I think it's an informative exploration of clinical cases that taught us about memory written in an accessible way. Please note that I received an ARC through a goodreads giveaway. All opinions are my own.