/   Home   /   Newsroom   /   News Updates

【Nature】Monkeys Master a Key Sign of Self-awareness: Recognizing Their Reflections

Feb 14, 2017     Email"> PrintText Size

Strange as it might seem, not all animals can immediately recognize themselves in a mirror. Great apes, dolphins, Asian elephants, and Eurasian magpies can do this—as can human kids around age 2. Now, some scientists are welcoming another creature to this exclusive club: carefully trained rhesus monkeys. The findings suggest that with time and teaching, other animals can learn how mirrors work, and thus learn to recognize themselves—a key test of cognition.

"It’s a really interesting paper because it shows not only what the monkeys can’t do, but what it takes for them to succeed," says Diana Reiss, a cognitive psychologist at Hunter College in New York City, who has given the test to dolphins and Asian elephants in other experiments.

The mirror self-recognition test (MSR) is revered as a means of testing self-awareness. A scientist places a colored, odorless mark on an animal where it can’t see it, usually the head or shoulder. If the animal looks in the mirror and spontaneously rubs the mark, it passes the exam. Successful species are said to understand the concept of “self” versus “other.”

But some researchers wonder whether failure is simply a sign that the exam itself is inadequate, perhaps because some animals can’t understand how mirrors work. Some animals—like rhesus monkeys, dogs, and pigs—don’t recognize themselves in mirrors, but can use them to find food. That discrepancy puzzled Mu-ming Poo, a neurobiologist at the Shanghai Institutes for Biological Sciences in China, and one of the study’s authors. “There must be some transition between that simple mirror use and recognizing yourself,” he says.

So Poo and his colleagues put three young male rhesus monkeys through an intensive training program. Each monkey was secured in a chair facing a mirror, and researchers flashed a red laser pointer at random positions nearby. When the monkeys touched the dot, they received a treat. Sometimes, they could see the dot only by using the mirror. "The monkey has to learn that the hand in the mirror is his own hand. And he has to learn how to control it precisely by watching it in the mirror," Poo says. "That’s the key." Three other monkeys, who served as controls, weren’t trained to respond...

For more details, please refer to http://www.sciencemag.org/news/2017/02/monkeys-master-key-sign-self-awareness-recognizing-their-reflections.


(Editor: CHEN Na)



Institute of Neuroscience

E-mail: ngong@ion.ac.cn

Related Articles

self-awareness;gauge conscieousness;mirror self-recognitin test;MSR

Monkeys Learn to Pass a Classic Test For Self-Awareness

Feb 14, 2017

The ability to look into a mirror and recognize oneself is a cognitive skill we all take for granted, but very few animals outside of humans are able to do it. New research conducted by a research team from the Institute of Neuroscience at the Chinese Academy of Sciences ...


Monkeys Can Learn to See Themselves in the Mirror

Jan 09, 2015

Unlike humans and great apes, rhesus monkeys don't realize when they look in a mirror that it is their own face looking back at them. But, according to a report in the Cell Press journal Current Biology on January 8, that doesn't mean they can't learn. What's mor...

Contact Us

Copyright © 2002 - 2017 Chinese Academy of Sciences