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See Inside June/July 2007

The Matrix in Your Head

The discovery of place-tracking neurons called grid cells, our experts say, "changes everything"

In the 2001 suspense thriller Memento, the lead character, Lenny, suffers a brain injury that makes him unable to remember events for longer than a minute or so. This type of amnesia, known as anterograde amnesia, is well known to neurologists and neuropsychologists. Like Lenny, sufferers remember events from their life histories that occurred before their injuries, but they cannot form lasting memories of anything that occurs afterward. As far as they recall, their personal histories ended shortly before the onset of their disorders.

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