Babies Learn The Sounds of Their Language

We mentioned that part of what makes learning language difficult is that languages carve up sounds and different Ianguages carve them up differently. A wide variety of different sounds, with very different spectrograms, will all seem like the same sound to us, and, in turn, that sound will seem sharply different from other sounds that are actually quite similar to it physically. Suppose you use a speech synthesizer to gradually and continuously change one particular feature of a sound, such a...