My 8 year old son is learning guitar. After a few months of rote-learning standard riffs and chords, he is beginning to experiment with his own tunes and chords. “Daddy,” he says as he fingers an improbable combination of notes. “Is this a real chord? It sounds kind of cool.” On balance, he spends as much time creating his own sounds as he does practicing the songs and scales his guitar teacher provides him. Both types of practice are important and both help to wire his developing his brain differently. In this TED Talk by brain surgeon Charles Limb, he …