Popular Science - USA (2019-10)

CHIMP-CHAT

if monkeys

could talk...

ASIF GHAZANFAR, NEUROSCIENTIST
AT PRINCETON UNIVERSITY

as told to Jessica Boddy

TALES FROM THE FIELD

For decades, neuroscien-
tists thought nonhuman
primates couldn’t speak
because their hyoid bone—found
near the larynx—is situated differ-
ently than ours. But that notion is
based on monkey-cadaver research
from the 1960s, when tools to see
live voice boxes didn’t exist.
Recently, we used X-rays to record
one of our lab’s macaques, Emiliano,
as he ate, yawned, verbalized, and
smacked his lips. With those videos,
we traced his vocal anatomy frame
by frame, and made a catalog of ev-
ery contortion it could make. Further
analysis showed he is fully capable of
producing five distinct vowel noises.
Once we knew monkeys could
articulate, we wanted to know how
they would come across. We used a
program that produces audio based
on vocal structure. My colleague’s
wife chose the common phrase:
“Will you marry me?” The result is
clear, if extraordinarily creepy: It
sounds like a very small, aggressive
person popping the question.
Goosebumps aside, this finding
flips what we knew about primates’
ability to talk. If anatomy isn’t pre-
venting them from speaking, what
is? That’s my next challenge.

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