Cat responds to rotational optical illusion. The illusion in question. But why does it work? Link to the actual paper.
"Sarah Moore researches how word-of-mouth stories affect our feelings about our experiences, and she has found that our feelings change when we share them. She says that when the storyteller analyzes or thinks about an emotional experience like a family vacation, it reduces the emotions, positive or negative, about the event. However, she notes that for practical experiences, such as buying and using a USB stick, analyzing and thinking more about the experience will amplify our feelings about it, be they positive or negative." (via bakadesuyo) [more inside]