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wel sounds. When tested in the morning, and again in the evening, the babies who’ d heard the tricky boundary vowel all night showed brainwave activity indicating that they could now recognise this new sound. They could identify the sound even when its pitch was changed, while none of the other babies could pick up the boundary vowel at all. Cheour doesn’ t know how babies acplish this nighttime learning, bunt she suspects that the special ability might indicate that unlike adults, babies don’ t “ turn off” their cerebral cortex while they sleep. The skill probably fades in the course of the first yea