Com aprenem una llengua: importa la freqüència en l'input?

Most of the time we adults take language for granted, unless one day we have to learn a new one. Then, things change radically. However, things seem to work differently for her (here a picture of a baby). She can't tie a simple knot, draw a decent circle or eat without making a mess, but she can learn on average 10 new words per day. At 17 months she cannot produce even a two-word utterance, but she can produce multiword sentences with little deviation from their target language just one year later. For this reason, the question as to how do children acquire their native language has prompted a lively theoretical debate and a great deal of empirical work.