What is the main reason that there has been more success teaching nonhuman primates to use sign language than spoken language?
A)Hand signals are easier than vocalizations.
B)Vocalizations are better controlled in humans.
C)Control of manual gestures is better in nonhuman primates.
D)All of the answer options are correct.

Question

Quizplus · Accepted Answer

Nonhuman primates have more success with sign language because their vocal apparatus is not as well-developed for speech as humans, making hand signals easier for them to learn and use. Additionally, control of manual gestures is naturally better in nonhuman primates, and the complexity of human vocalizations requires fine control that nonhuman primates generally lack.

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