The range through these states is mediated by the arousal system, a network of tracts converging from sensory systems to integrating centers in the brain stem.

Just as the G8 leaders, world bodies and businesses talk increasingly from the same script, so the protesters' once disparate political and social analyses are converging.

Dozens of recording stars began converging on a Hollywood studio Monday to add their voices to a song they hope will raise millions of dollars for Haitian earthquake relief.