Sea Stars
Sea stars have radial symmetry and despite having a complex system of nerves they have no central connector or brain. The nerves of the sea stars are composed of a radial nerve running along each ray and a nerve around their mouth that connects to all the other nerves. Since the star fish have no brain all information is actually stored in the radial nerves. Memories are also stored here, as well as the decision-making process. The five rays must somehow work together in order to move the starfish and survive. It is unclear how the rays actually communicate, but it is theorized that the rays may be able to take control of each other.
Even though starfish do not have a brain or any central connection of nerves they are still able to learn and function. They are still able to locate food and reproduce. They are also able to detect the different textures of sand or rocks and are able to detect different levels of light. All of this shows that they are somehow able to function without a brain.
Even though starfish do not have a brain or any central connection of nerves they are still able to learn and function. They are still able to locate food and reproduce. They are also able to detect the different textures of sand or rocks and are able to detect different levels of light. All of this shows that they are somehow able to function without a brain.