Why forgetting may make your mind more efficient

In the quest to fend off forgetfulness, some people build a palace of memory.

It’s a method for memorizing invented in ancient times by (legend has it) the Greek poet Simonides of Ceos, more recently made popular by multiple best-selling books (and the “mind palace” of Benedict Cumberbatch’s Sherlock Holmes).
*Memory palaces provide imaginary architectural repositories for storing and retrieving anything you would like to remember. Sixteen centuries ago, St. Augustine spoke of “treasures of innumerable images” stored in his “spacious palaces of memory.” But twenty-first century scientists who study memory have identified an important point to remember: Even the most luxurious palace of memory needs trash cans.
“There are memories that we don’t want and we don’t need,” says neuroscientist Maria Wimber. “Forgetting is good and an adaptive thing.”
*Traditionally, forgetting has been regarded as a passive decay over time of the information recorded and stored in the brain. But while some memories may simply fade away like ink on paper exposed to sunlight, recent research suggests that forgetting is often more intentional, with erasure orchestrated by elaborate cellular and molecular mechanisms. And forgetfulness is not necessarily a sign of a faulty memory. “In fact,” Wimber says, “it’s been shown over and over in computational models and also in animal work that an intelligent memory system needs forgetting.”

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