Now, for the first time, researchers have shown that information can also flow in the opposite direction at the neuron intersection we call a synapse. "Once again, exact measurements have shown that reality is more complex than a simplified model would suggest," said cellular neuroscientist Peter Jonas from Austria's Institute of Science and Technology (IST). Source: https://www.sciencealert.com/nerves-have-been-found-communicating-in-the-wrong-direction-challenging-an-ages-old-assumption