Beyond the Sea Squirt: A Journey with Reflexes

At the most fundamental level the only reason we have a brain is because we move. To develop the ability to feel and think actually requires movement as a first step. Sea squirts illustrate this well. Sea squirt larvae have a very rudimentary brain and nervous system. However, they have no mouth or way to feed. The larvae are able to move to the sea floor where they cement themselves head first and this is where they will stay. As the sea squirt will never move from that spot it no longer n...