Photostimulation's the use of light to artificially activate biological compounds, cells, or even whole organisms. Photostimulation can be used to noninvasively probe the causal relationships between different biological processes, using only light. In the long run, photostimulation may be useful as a therapy, using light to adjust the biological state of human patients. Photostimulation methods fall into two general categories: one set of methods uses light to uncage a compound that then become… (More on Photostimulation)