The Differences Between Boys and Girls in Vocalizations

How did you come by all these recordings in the first place and how many recordings did you have? 450,000 hours of recording. What we're interested in is the sounds that are actually thought to be precursors to speech. Those were produced at rates two to three per minute. And that's true of both boys and girls, except that the boys are a little more. They were nine to 10%.