Final answer:
Research has changed the way we think about monkey vocalizations by demonstrating that nonhuman primates are capable of learning and using a symbolic form of communication, similar to human language.
Step-by-step explanation:
Research has changed the way we think about monkey vocalizations by providing a wealth of data and opening up new possibilities for understanding the language abilities of nonhuman primates. One example of this is the work with Koko, a gorilla who learned to use sign language. By teaching Koko to use signs, researchers were able to demonstrate that nonhuman primates are capable of learning and using a symbolic form of communication, similar to human language.