Species Having Same Neurons Doesn’t Mean Same Wiring.

In Brain Circuitry, Brain Science by Brainy Days Ahead

Two species are examined by scientists at Georgia State University. Neurons are connected to each other to form networks that underlie behaviors. The scientists rewired the neural circuit of a type of sea slug called a giant nudibranch,  and gave it the connections of another species of sea slug, the hooded nudibranch, to test a hypothesis about the evolution of neural circuits and behavior. In the study, the researchers examined how the brains of these sea creatures produced swimming behaviors. They found that even though the brains of the giant nudibranch and the hooded nudibranch had the same neurons, and even though the swimming behaviors were the same, the wiring was different. The conclusion from the experiment was that the evolution of microcircuitry could play a role in the evolution of behavior. Over the course of evolution, behaviors may be conserved, but the underlying neural basis for the behaviors may evolve.