Tag Archives: amnesia

Learning About Memory from a Woman Who Lost Hers

Chart from "The Phrenological Journal," (c) The Wellcome Trust

Lonni Sue Johnson was a successful illustrator — think New Yorker covers — amateur violist, pilot, and small businesswoman. When the herpes simplex virus attacked her brain, it caused substantial tissue loss in her medial temporal lobes; she lost almost her entire lifetime of knowledge and experiences, along with the ability to form new memories. In Aeon, Michael Lemonick describes how she’s invaluable to neuroscientists working to understand how we make, organize, and store memories.

There’s no established protocol, however, for probing an amnesia victim on the sorts of knowledge Johnson gathered in her lifetime. The neuroscientists at Johns Hopkins started at the most basic level they could think of – the ‘Who painted this?’ test, which she pretty much failed. Her semantic memory about art and artists, her primary area of expertise, was significantly impaired. Remarkably, though, when the scientists included some of her own artworks in the testing, she correctly flagged every one as hers. Even more surprising, when the researchers added drawings done in a style somewhat similar to Johnson’s, she picked them out as artworks she might have produced. To do so, she had to be drawing on some sort of memory. It clearly wasn’t episodic memory, since artworks aren’t events – but it’s unclear that it qualifies as semantic memory either, since it addresses an ineffable quality, not a set of facts. ‘I don’t think we know how to characterise that sort of memory,’ Barbara Landau, one of the Johns Hopkins scientists, told me in an interview.

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The Story of H.M.: The Amnesiac Who Profoundly Changed the Way We Think About Memory

Sam Kean | The Tale of Dueling Neurosurgeons | 2014 | 12 minutes (3,008 words)

 
For our latest Longreads Member Pick, we’re excited to share a story from The Tale of the Dueling Neurosurgeons, a new book from science reporter Sam Kean looking at stories about the brain and the history of neuroscience. Here’s Kean:

In our minds, we more or less equate our identities with our memories; our very selves seem the sum total of all we’ve done and felt and seen. That’s why we cling to our memories so hard, even to our detriment sometimes—they seem the only bulwark we have against the erosion of the self. That’s also why disorders that rob us of our memories seem so cruel.

In the excerpt below, I explore one of the most profound cases of amnesia in medical history, H.M., who taught us several important things about how memory works. Perhaps most important, he taught us that different types of memories exist in the brain, and that each type is controlled by different structures. In fact, H.M. so profoundly changed our ideas about memory that it’s hard to remember what things were like before him.

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