Recent technical developments have transformed how neuroscientists can probe brain
function. What was once thought to be difficult and perhaps impossible, stimulating a single
set of long range inputs among many, is now relatively straight-forward using optogenetic
approaches. This has provided an avalanche of data demonstrating causal roles for circuits
in a variety of behaviors. However, despite the critical role that neuropeptide signaling plays
in the regulation of behavior and physiology of the brain, there have been remarkably few …