Why Do Worms Wriggle Without a Brain?
If you were a curious child you probably played with worms. If you were a slightly cruel one you probably chopped a few in half with a sharp rock and watched the two halves continue to continue to crawl for a while independently, even though one was separated from the worm’s brain. Did you take a moment to wonder why that happened? That mystery might have been solved. Scientists have accepted the theory that the brains of worms and insect larvae act as central pattern generator, that is it creates rhythmic contractions that extend along the their bodies. That doesn’t explain why those contractions continue, however, if for example some mean little kid severs a worm’s ventral nerve cord by doing some impromptu surgery with a rock. A new mathematical model by Dr. Paolo Paoletti of The University of Liverpool and Professor L Mahadevan of Harvard, however, hypothesizes that local nerves are in greater control and the worm’s body is reacting to the contours of the surfaces it touches. “When we analyse humans running there is clearly local