14 June 2002
Vol 296, Issue 5575

About The Cover

Cover image expansion

COVER Particle-like waves in an excitable medium move according to imposed excitability gradients. Normally unstable, these waves can be stabilized by feedback, with their motion controlled to yield a desired trajectory (red curves). Left and right panels show superpositions of snapshots of experimental and simulated wave behavior, respectively. 2009 [Image: T. Sakurai et al.]