It has to be getting sensory input, though, right? So it must be reading that out of the brain somehow even if it's not controlling the brain, right? Or no?

It has to be getting sensory input, though, right? So it must be reading that out of the brain somehow even if it's not controlling the brain, right? Or no? Wondering now how ants walk and climb and such -- it would seem easier to go for the brain if you need to effect complex behaviors like that. But I recall that with insects' wings, at least, the brain only needs to send one signal and they'll beat for a long time. So maybe such behaviors are stored down by the legs or whatever, and that's why it doesn't need to go for the brain?