Returning to the question of species-specificity

Hi all,

I wanted to leave a link to an excellent article which discussed how studies of non-human animal perception contribute to our theories of human perception: http://www.psy.cmu.edu/~lholt/publications/KluenderLottoHolt2005.pdf

Kuhl 2004: Perceptual abilities

Why can't monkeys talk if they can perceive a little better than humans?

Are children's ears attuned sharper than adults to hear subtle acoustic changes?

I'm not very clear on the topics that include a continuum of sounds and why babies can distinguish these sounds but outgrow the ability