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496 pages, Hardcover
First published April 7, 2016
On December 5, 2008, the front page of the New York Times included an unusual item: H. M., Whose Loss of Memory Made Him Unforgettable, Dies. It was hardly the first time that an obit piece had appeared on the front page, but it is unlikely that many with quite so little public recognition had ever appeared there. The “H.M.” in question was one Henry Gustave Molaison. He has been the inspiration for many books, at least one play and a major motion picture. Mostly, though, while he had never studied medicine, or practiced in any medical field, Molaison had made a huge contribution to our understanding of the human brain.


Memory scientists often speak of the important difference between knowing that a certain fact is true and knowing how you came to learn it. For example, here’s a simple question: What’s the capital of France? The answer probably leapt to your mind in an instant. Now, here’s another question: When did you learn that Paris is the capital of France? If you’re like most people, you have no idea. That particular fact twinkles in your mind amid an enormous constellation of other facts, most of them forever disconnected from the moment they first sprang to life. The store of mostly disconnected facts is known as your semantic memory.This gives you a taste of how fluidly Dittrich writes of a subject that, in lesser hands, could easily have become dense.
Your semantic memory is contrasted with your episodic memory, which is your memory of fleshed-out narratives rather than merely facts. When you engage your episodic memory, you engage in a form of mental time travel, bringing yourself back to a particular place and time, reimagining a scene you’ve already lived. When you engage your semantic memory you are doing the mental equivalent of flipping through an encyclopedia or photo album, plucking out bits of information whose origins might be unclear.





Prior to 1950, memory was not associated with a particular structure of the brain but was thought to be distributed equally or "equipotentially" across the cerebral landscape. According to this early view, attempting to locate the seat of memory was the neurological equivalent of a snipe hunt: it simply did not exist. Eventually, it was discovered not only that this was a false conclusion but that whenever a normal person is paying conscious attention to something, he is simultaneously recording it in the temporal cortex of each hemisphere. Every conscious aspect of the experience seems to be included in these records.Much of the book is of course about post-lobotomy Henry Molaison, on whom the operation was performed by Dr. Scoville, not to deal with mental illness but as an experiment to treat his epilepsy, making him just by chance, a "pure subject". There are some who treat H.M. almost as a commodity but Brenda Milner, educated at the University of Cambridge & working at McGill University in Montreal, is easily the heroine of this tale, someone who while conducting meticulous research on Henry, always treated him as a person rather than merely as a "subject". It is said that the most compelling moments were those when Henry, "the most studied human research subject in history" would attempt to explain what it was like to be him.
It was as Wilder Penfield would later describe it, as though there were a "tape recorder" in the brain, activated at the moment of birth & stopping only at death. Each event in a person's life is stored away as a distinct "nuerone pathway." Even later events that people might later have no ability to recall of their own volition, the ephemera of everyday life, were all carefully preserved. It would appear, Penfield said, that the memory record continues intact even after the subject's ability to recall it disappears.
And I was left with H.M. And I remember vividly. What happened was. Something like. Whatever was going on. Someone was called out of the room. Came back in. And H.M. said, "Have you been in here before?"There are some aspects of Patient H.M. that could have used additional support. Among them, I think a brief diagram of the brain regions would have been enormously helpful, as would a glossary of some of the many anatomical terms that the author tosses about within the book. However, while this book is probably not of interest to everyone, I found it quite enthralling, in spite of the listed minor misgivings.
Today it’s possible to make a persuasive argument that Edward Jenner saved more human lives than any single person in history. Taking this into account, perhaps it’s easy to argue that jeopardizing the life of an eight-year-old boy was acceptable.
Sims went on to become president of the American Medical Association and is widely considered the father of modern gynecology. To this day, visitors to Central Park in New York City can see the larger-than-life bronze statue of him standing right across the street from the New York Academy of Medicine.
For most of human history, our attitudes toward human experimentation were strictly utilitarian. If the scientific benefits were great enough, then almost any cost was justified. In an 1895 article called ‘The Relative Value of Life and Learning,’ a prominent University of Chicago chemist named E. E. Slosson summed up this attitude when he wrote that ‘a human life is nothing compared with a new fact in science.’