"Scientists have developed a technique that can recreate a 3D map of the cells that were firing in a mouse’s brain a few hours before it died, giving them a high-resolution picture of what was going on in the mouse’s head during life—in this case, when it met a member of the opposite sex. The team of researchers published their results yesterday in the journal Cell Reports." - Todd Hoff

So it's persistent memory, after all. - Eivind