Monkey Hear, But Monkey Not Comprehend
Thu Jan 15, 5:08 PM ET Add Health - HealthDay to My Yahoo!
By Randy Dotinga HealthDay Reporter
THURSDAY, Jan. 15 (HealthDayNews) -- Researchers say they've come closer than ever to figuring out
why humans can string sentences together and our hairy cousins can't.
One of the major barriers to a simian Shakespeare appears to be the inability of primates to
comprehend anything other than the simplest rules of grammar, according to a new study.
Monkeys who listened to alternating male and female voices couldn't pick up on complex patterns
designed to mimic those of human speech, researchers found. This lack of understanding could be a
"fundamental bottleneck on animal thought," says study co-author Marc D. Hauser, a professor of
psychology at Harvard University.
While monkey grammar skills may seem like a pretty arcane topic harkening back to diagrammed
sentences on chalkboards, it's actually at the center of a major mystery: How did human speech
evolve? How does the way humans talk to each other differ from the way animals communicate?
"Grammar may be the defining feature of human language, what makes our language different from other
forms of animal communication," says Keith R. Kluender, a professor of psychology who studies speech
perception at the University of Wisconsin. "It's a pretty big deal."
It's no secret that animals can communicate with each other in simple ways -- think of those
midnight neighborhood symphonies of howling dogs or cats in heat. And humans have managed to teach
sign language to apes and dolphins.
But Hauser says the top number of words they have learned is in the 300-to-400 range, which doesn't
even compare to the 60,000-word vocabulary of a typical high school graduate.
Apes "have learned signs that refer to things in their world, like food and actions," Hauser says.
"They could label things and could sign 'apple' or 'pond.' But what they couldn't say is, 'My apple
is in the pond' or 'on the chair.' "
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