If you drift off course, it’s useful to notice it in good time. The brain thus evaluates the perceived motion of the environment and translates it into course-correcting movements. The concept seemed clear, but recent studies in zebrafish now show that the eyes have to see more than a just a general movement of the environment. A local component is also required in order to detect a drift and initiate a countering motion. The study by Andreas Kist and Ruben Portugues from the Max Planck Institute of Neurobiology indicates a distinctly more complex brain circuitry than was previously thought.
Humans, and many animals, use this information to detect