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Sfogliando l'articolo Auditory development in the fetus and infant, di Graven e Browne (2008) leggo:

The auditory system in the human fetus and infant has its own developmental sequences. The anatomical or structural parts of the system develop early. The structural parts of the cochlea in the middle ear are well formed by 15 weeks' gestational age and are anatomically functional by 20 weeks' gestation.

ed è per questo che, per stare proprio sul sicuro, la settimana scorsa io e L. siamo andati a sentire Bob Dylan.