Optogenetic Visualization of Presynaptic Tonic Inhibition of Cerebellar Parallel Fibers. Berglund K, Wen L, Dunbar RL, Feng G, Augustine GJ. Optogenetic Visualization of Presynaptic Tonic Inhibition of Cerebellar Parallel Fibers. J Neurosci. 2016;36(21):5709-23. doi:10.1523/JNEUROSCI.4366-15.2016 Read more