Curious behavior : yawning, laughing, hiccupping, and beyond

Provine boldly goes where other scientists seldom tread—in search of hiccups, coughs, yawns, sneezes, and other lowly, undignified, human behaviors. Our earthiest instinctive acts bear the imprint of our evolutionary origins and can be valuable tools for understanding how the human brain works and what makes us different from other species.