From an article on Ars Technica by Jennifer Ouellette.
“Scientists have known how the brain encodes the aspect of space in our memories since 2005, with the Nobel Prize-winning discovery of grid cells. These reside in a brain region called the medial entorhinal cortex (MEC), and they collectively map our environment into hexagonal units.
“The philosopher Martin Heidegger suggested in the 1920s that time persists solely as a consequence of the events that take place within it.
> Now, a team of Norwegian scientists has confirmed the mechanism the brain uses to make sense of the passage of time as we experience something, thanks to the help of a chocolate-loving lab rat. NamedMarco.
“The researchers put their hunch to the test in an experiment with a rat named Marco. In the first round, Marco was free to roam about for two hours, exploring his environment in search of his favorite treat: bits of chocolate. The researchers tracked his brain activity [...] as he did so and then successfully worked backward from the recorded signal to verify exactly when various key events (like finding a piece of yummy chocolate) had occurred during the experiment.”