Are human speech-like vocalizations made by some mammals equivalent to conversation--or just a rough estimation of it?
By Tina Adler
Maya, a noisy, seven-year-old pooch, looks straight at me. And with just a little prompting from her owner says, "I love you." Actually, she says "Ahh rooo uuu!"
Maya is working hard to produce what sounds like real speech. "She makes these sounds that really, really sound like words to everyone who hears her, but I think you have to believe," says her owner, Judy Brookes.
You've probably seen this sort of scene onYouTube and David Letterman. These dog owners may be onto something: Psychologist and dog expert Stanley Coren of the University of British Columbia tells the story of a colleague who always greeted her dog, Brandy, with a cheerful, two-syllable "Hel-lo!" It wasn't long until Brandy returned the greeting, which sounded very much like her owner's salutation, says Coren, author of How to Speak Dog: Mastering the Art of Dog–Human Communication. But do dogs really talk? Back in 1912 Harry Miles Johnson of Johns Hopkins University said, emphatically, "no." In a paper in Science, he generally agreed with the findings of Oskar Pfungst of the Institute of Psychology at the University of Berlin who studied a dog famous for its large vocabulary. The dog's speech is "the production of vocal sounds which produce illusion in the hearer," Johnson wrote. He went on to warn that we should not be surprised if "scientists of a certain class…proclaim that they have completely demonstrated the presence in lower animals of 'intelligent imitation'." Nothing in the last century has really changed that scientific opinion. (No one has ever questioned whether dogs communicate with each other, but calling it "talking" is something else.) So what are Maya and her cousins doing? It's more appropriate to call it imitating than talking, says Gary Lucas, a visiting scholar in psychology at Indiana University Bloomington. Dogs vocalize with each other to convey emotions—and they express their emotions by varying their tones, he says. So it pays for dogs to be sensitive to different tones. Dogs are able to imitate humans as well as they do because they pick up on the differences in our tonal patterns. Lucas likens this behavior to that of bonobos, primates that can imitate some tonal patterns, including vowel sounds, pitch changes, and rhythms, studies show. "The vocal skills of some of the dogs and cats on YouTube suggest that they might also have some selective tonal imitation skills," he says. What's happening between dog and owner-turned-voice-coach is fairly straightforward, Coren says: Owner hears the dog making a sound that resembles a phrase, says the phrase back to the dog, who then repeats the sound and is rewarded with a treat. Eventually the dog learns a modified version of her original sound. As Lucas puts it, "dogs have limited vocal imitation skills, so these sounds usually need to be shaped by selective attention and social reward." In the Letterman video "a pug says, 'I love you' and it's very cute, but the pug has no idea what it means," Coren says. "If dogs could talk, they would tell you, 'I'm just in it for the cookies.'" Scientists have made some progress in their study of this important subject: They've learned why dogs, and other animals, have rather poor pronunciation and, for example, completely botch consonants. They "don't use their tongues and lips very well, and that makes it difficult for them to match many of the sounds that their human partners make," Lucas says. "Try saying 'puppy' without using your lips and tongue." Despite what they may lack in the elocution department, dogs do communicate their feelings to humans as well as read our cues, thanks to domestication, Julia Riedel and colleagues of the Max Planck Institute (M.P.I.) for Evolutionary Anthropology reported in March 2008 inAnimal Behavior. Dogs follow people's pointing, body posture, the direction of their gaze, and touches for cues to find hidden food, notes Mariana Bentosela and colleagues at the University of Buenos Aires in the July 2008 Behavioural Processes. They also gaze at their trainer when they need more information to find their reward. Some dogs learn to understand an impressive number of words, as well. A gifted border collie, Rico, mastered the names of more than 200 objects using a technique called fast-tracking that small children also employ, Juliane Kaminski, also of M.P.I. Evolutionary Anthropology and colleagues reported in 2004 in Science. The researchers introduced a novel item into Rico's mix of toys then asked him to retrieve it. He did so by associating the unfamiliar name with the unfamiliar object. He even remembered the name of the toy a month later. "That's the kind of fast-tracking or exclusionary learning, which we used to think only human beings and the talking apes—the ones taught language—could use," Coren says. "For the psychologists it was, 'Wow, how did he learn that word?!'"
