John Iversen is Research Fellow in Theoretical Neurobiology and Karp Foundation Fellow at The Neurosciences Institute. His work is devoted to understanding how humans perceive the world—how we create a rich and detailed view of the world from sensory stimuli. Central to this work is the idea that perception is fundamentally a constructive process, involving the integration of multiple senses as well as behavior. Key to his work is the use of music perception and production as a tool for the study of complex brain processes, including those that may underlie language. A common theme running through all his research projects is rhythm— most generally understood as the organization of events in time.