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That's assuming they are stateless (i.e. that they can't learn), so that the ordering of input triggering has no effect on outputs. BTW: some small spiders press their brains not only into their abdomens, but into their legs . e.g. http://news.nationalgeographic.com/news/2011/12/111219-spide... Spiders gotta spin.
Arguably, even human brains work that way. You can't really draw a line across part of the CNS and say "This is where the brain stops." The retina, for instance, is almost as much a part of your brain as it is your eye. By the same token, it's not always easy to classify complex movements as reflexes or thought-guided actions. Cut a chicken's head off while it's walking, and it will keep going for a while. My underst…
Re: How tiny wasps cope with being smaller than amoebas
#71Research has also shown that the neurons in the digestive system can control it autonomously, even when disconnected from the brain: