The results were out of the ordinary. The monkeys could actually make out five separate vowels. This was a whole new step for the study. But monkey's simply just don't have the brain power to make the speech. This now shows a some what better understanding on the evolution and how us humans were able to develop such a complex and beautiful trait such as speech. And even though monkeys can make out vowels they would still need to be able to make out constants with their vocal cords first to make it to the next step in speaking.