The Rats That Coulda-Woulda-Shoulda

Have you ever come home to find your dog with his head hung low, looking guilty, only to find that he chewed up your slippers? Or heard about a cat that adopted a baby squirrel? Or a dog that saved a kitten in a ravine and nursed it? Or the rabbit that pined away after her sister died?

Many people dismiss outright the idea that animals can have emotions at all, much less display altruism: it's a dog-eat-dog world, after all. Animals are slaves to instinct, and attempts to anthropomorphize their behavior is misguided. These folks admit that animals can feel fear and rage, but more complex emotions, such guilt, jealousy, envy, love and regret are beyond their ken.

But evidence is building that animals do in fact have emotions, very similar to humans. A study conducted at the University of Minnesota has tested this. The experiment was structured to determine whether rats could feel regret:

“What we found is that when a rat makes a mistake of its own agency, then the rat is able to recognize that mistake, and it thinks about the thing it should have done,” said A. David Redish, a neuroscience professor at the University of Minnesota.

Researchers thought that rats looked like they were feeling regret during another experiment, so they constructed a study to test it. They discovered that not only do rats look like they have regrets, the rats are actually thinking about what they should have done.

The experiment involved making rats decide whether to wait for their favorite food, or eschew the wait for instant gratification.  The researchers measured brain activity in the rat that indicated memory of the preferred food.

Of course, it has to be this way. In order to learn, animals have to be able to make mental associations like this.

When a pet bounces up and down excitedly to see you come home, or sulks after getting yelled at, it's clear the animal is experiencing genuine emotions that are no different from human ones. You don't see that kind of behavior in insects or lower animals, though even lizards and turtles can recognize individual humans and prefer their company: it might not be love, but what can you expect from a cold-blooded animal?

It's a fair question to ask whether these are "real" emotions, or just brain chemistry associated with the learning process. Mammalian brains release endorphins that result in pleasure, and adrenalin is involved with the fear response. Oxytocin (the "love" hormone) is present in mammals and works the same way as it does in humans.

But it's also a fair question to ask whether that same mechanistic biology that operates in human really makes us substantially different from other mammals. Psychopaths lack basic human emotions such as empathy, regret and remorse. They're often described as animals who have no souls.

Our legal system concurs with this judgment: people who express no remorse for their crimes are often given longer sentences, or even sentenced to death for their lack of empathy.

Which makes you wonder: is the cat who saved a little boy from a dog attack more human than Ted Bundy?