The researchers achieved their goal and found that their automatic vocal assessment (AVA) score "demonstrated reasonable levels of reliability and validity comparable to those of existing standard clinical assessments." That is, their AVA age-standardized score and estimated development age reflected a reasonable estimation of their subjects' expressive language development for both typically and non-typically developing children.
What does it all mean? Well, the authors caution that, while their results were encouraging, their sample size left much to be desired, as it only contained native English speakers from a small geographical area. This means that it is in no way ready to be used in the field as a valid assessment tool. That being said, it is quite exciting to think about the possible clinical implications of this course of study. First of all, the idea that a child's range of vocalizations and phonemes is representative of their overall language development is a pretty interesting one (no more counting morphemes?!? ;-) ). And speech recognition in the natural environment has long been an exciting frontier that promises the possibility of assessing children's true skills, not just those they demonstrate in the very weird and un-natural clinical environment. There will never be a replacement for the eyes and ears of a trained clinician, but I find it intriguing and stirring that the capacity of my eyes and ears could be enhanced in the interest of better helping kids.