4/2014Guided by Light
A zebrafish larva that is only a few days old isn’t yet very mobile: at this age, it is capable of a few
vigorous tail movements and not much else. For Herwig Baier at the Max Planck Institute of
Neurobiology in Martinsried, however, that’s enough. For him, a simple and, above all, transparent
brain is much more important. His particular aim is to switch individual neurons on and off using
light and thus discover how the brain controls movement and behavior.