**Optogenetics can control the activity of a genetically defined set of neurons to see if they are important for your topic of interest. e.g. express anion-conducting channelrhodopsins (ACRs, an inhibitory type of ChR) in α1β2γ2 GABA-R expressing neurons. | **Optogenetics can control the activity of a genetically defined set of neurons to see if they are important for your topic of interest. e.g. express anion-conducting channelrhodopsins (ACRs, an inhibitory type of ChR) in α1β2γ2 GABA-R expressing neurons. |