An optogenetic illumination system based on the use of a digital micromirror device and video tracking software is reported, which allows real-time light delivery with high spatial resolution to specified targets in freely moving Caenorhabditis elegans. Also in this issue, Stirman et al. report a similar illumination system using a liquid crystal display projector. Both methods allow optogenetic perturbation of a variety of neural circuits in the behaving worm.
- Andrew M Leifer
- Christopher Fang-Yen
- Aravinthan D T Samuel