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Anne Fernald explains our need to goochie-goochie-goo at every baby we meet, and absolves us of our guilt. This kind of talk, dubbed motherese, is an instict that crosses cultural and linguistic boundaries. Caecilius was goochie-goochie-gooing in Rome; Grunt was goochie-gooing in the caves. Radio Lab did our own study of infant-directed speech, recording more than a dozen different parents. The melodies of these recordings illustrate Fernald's findings that there are a set of common tunes living within the words that parents all over the world intone to their babies.

Then, science reporter Jonah Lehrer takes us on a tour through the ear as we try to understand how the brain makes sense of soundwaves and what happens when it can't. Which brings us to one particularly riotous example: the 1913 debut performance of Stravinsky's "Rite of Spring." Jonah suggests that the brain's attempt to tackle disonant sounds resulted in old ladies tackling each other. Disney might even show up for the brawl.

» Anne Fernald's Center For Infant Studies at Stanford

» Time Magazine profile on Stravinsky, by Philip Glass

» More on the "Rite of Spring" riot

» Articles by Jonah Lehrer for Seed Magazine