Brought to you by Scientific American
John Pavlus on February 15, 2008 9:55 AM Comments (0)
Actually they're red blood cells treated with an antibiotic. But isn't my description just so much more delicious?
via Wired
The rats are tickled in one chamber, but not tickled in another chamber. Then they are given a choice between the chambers, and the one they spend more time in is considered to be the one that they associate with some positive event.
by Maggie