According to Jaak Panskeep studies and many other, it is believed rats are able to experience joy, fear, lust, panic, have the ability to play, and laugh. "by electrically stimulating the brain of rats and guinea pigs," Panskeep has found all of these emotions existing in the mammalian sub-cortex. Its is believed that play and laughter in rats has the evolutionary advantage of survival skills, such as hunting or even escaping from a predator, and also a tool to help with mating. By play "fighting" rats will be better at defending off predators, and the social aspect of laughing will make mating with one another an easier process. Because it is very difficult to hear a rats laughter Panskeep used a bat detector to decode the rats frequency signals.
